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network cisco ccna gns3 certification arteq
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Sunday, September 30, 2012

20,000 hits...

turn over that leader board... our spanning trees are ready to take your calls...

11 months...

that's an average of 1820 a month...

and 573 posts...

for an average of  52 posts a month...



do not be mistaken... i did it all for me... you are collateral damage...

cookbook cost...

to change the cost of an ospf link use...

ip ospf cost (cost)

i cannot think of a good reason to ever do this... it might be instructive for a lab so that you could see something weird, or to illustrate why not to do this... use at your own risk...

onto something useful...

the summary of all summaries, as it were...

a default route is not automatically distributed to a neighbor...


however default-information originate will ship it next door...

light up ospf on r3 and r4 for area 1

r1#sh ip route

Gateway of last resort is not set

      1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        1.1.1.0/24 is directly connected, Loopback1
L        1.1.1.1/32 is directly connected, Loopback1
      10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
C        10.1.1.0/24 is directly connected, FastEthernet0/0
L        10.1.1.1/32 is directly connected, FastEthernet0/0
C        10.1.2.0/24 is directly connected, FastEthernet1/1
L        10.1.2.1/32 is directly connected, FastEthernet1/1
O IA  192.168.1.0/24 [110/782] via 10.1.1.2, 00:03:55, FastEthernet0/0

now set up a default route on r2...

r2#sh ip route

Gateway of last resort is 192.168.1.2 to network 0.0.0.0

S*    0.0.0.0/0 [1/0] via 192.168.1.2
      1.0.0.0/24 is subnetted, 1 subnets
O        1.1.1.0 [110/2] via 10.1.1.1, 00:05:29, FastEthernet0/0
      10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        10.1.1.0/24 is directly connected, FastEthernet0/0
L        10.1.1.2/32 is directly connected, FastEthernet0/0
      192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.1.0/24 is directly connected, Serial1/1
L        192.168.1.1/32 is directly connected, Serial1/1

r1#sh ip route

Gateway of last resort is not set

      1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        1.1.1.0/24 is directly connected, Loopback1
L        1.1.1.1/32 is directly connected, Loopback1
      10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
C        10.1.1.0/24 is directly connected, FastEthernet0/0
L        10.1.1.1/32 is directly connected, FastEthernet0/0
C        10.1.2.0/24 is directly connected, FastEthernet1/1
L        10.1.2.1/32 is directly connected, FastEthernet1/1
O IA  192.168.1.0/24 [110/782] via 10.1.1.2, 00:08:09, FastEthernet0/0

note that on r2 the gateway of last resort is locally significant only...

default-information originate will distribute it...

r2(config)#router ospf 1
r2(config-router)#default-info originate

r1#sh ip route

Gateway of last resort is 10.1.1.2 to network 0.0.0.0

O*E2  0.0.0.0/0 [110/1] via 10.1.1.2, 00:00:24, FastEthernet0/0
      1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        1.1.1.0/24 is directly connected, Loopback1
L        1.1.1.1/32 is directly connected, Loopback1
      10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
C        10.1.1.0/24 is directly connected, FastEthernet0/0
L        10.1.1.1/32 is directly connected, FastEthernet0/0
C        10.1.2.0/24 is directly connected, FastEthernet1/1
L        10.1.2.1/32 is directly connected, FastEthernet1/1
O IA  192.168.1.0/24 [110/782] via 10.1.1.2, 00:10:36, FastEthernet0/0

it shows as external type 2 by default...

r4#sh ip route

Gateway of last resort is 192.168.1.1 to network 0.0.0.0

O*E2  0.0.0.0/0 [110/1] via 192.168.1.1, 00:01:53, Serial1/1
      1.0.0.0/24 is subnetted, 1 subnets
O IA     1.1.1.0 [110/783] via 192.168.1.1, 00:09:00, Serial1/1
      10.0.0.0/24 is subnetted, 1 subnets
O IA     10.1.1.0 [110/782] via 192.168.1.1, 00:09:00, Serial1/1
      172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C        172.16.1.0/24 is directly connected, FastEthernet0/0
L        172.16.1.2/32 is directly connected, FastEthernet0/0
      192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.1.0/24 is directly connected, Serial1/1
L        192.168.1.2/32 is directly connected, Serial1/1

but you can change that...

r2(config-router)#default-info originate metric-type 1

r1#sh ip route

Gateway of last resort is 10.1.1.2 to network 0.0.0.0

O*E1  0.0.0.0/0 [110/2] via 10.1.1.2, 00:00:35, FastEthernet0/0
      1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        1.1.1.0/24 is directly connected, Loopback1
L        1.1.1.1/32 is directly connected, Loopback1
      10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
C        10.1.1.0/24 is directly connected, FastEthernet0/0
L        10.1.1.1/32 is directly connected, FastEthernet0/0
C        10.1.2.0/24 is directly connected, FastEthernet1/1
L        10.1.2.1/32 is directly connected, FastEthernet1/1
O IA  192.168.1.0/24 [110/782] via 10.1.1.2, 00:16:43, FastEthernet0/0

note the difference between type 1 and type 2... type 1 includes the internal cost...





cookbook ospf 2...


remove ospf from the interfaces... add network statements...

with ospf you can filter lsa's in but not out, unless you filter all of them out... but you love lsa's so don't do that...

r2#sh ip route ospf

Gateway of last resort is not set

      1.0.0.0/24 is subnetted, 1 subnets
O        1.1.1.0 [110/2] via 10.1.1.1, 00:00:49, FastEthernet0/0

r2#sh access-list 1
Standard IP access list 1
    10 deny   1.1.1.0 (2 matches)
    20 permit any
r2#sh run | beg router
router ospf 1
 network 10.1.1.0 0.0.0.255 area 0
 distribute-list 1 in FastEthernet0/0

r2#sh ip route ospf
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is not set

r2(config-router)#distribute-list 1 out f0/0
% Interface not allowed with OUT for OSPF

r2(config-router)#no access-list 1
r2(config)#do sh ip route ospf

Gateway of last resort is not set

      1.0.0.0/24 is subnetted, 1 subnets
O        1.1.1.0 [110/2] via 10.1.1.1, 00:00:09, FastEthernet0/0

so be careful here, and listen to the cook:

It's important to remember that unlike EIGRP and RIP, OSPF uses a link state rather than a distance vector algorithm. One place where this difference becomes clear is in route filtering. At a minimum, every router in an area must see the LSAs for every other router in the same area. Depending on the type of area, it may also see summary LSAs representing routing information from other areas or other autonomous systems. These LSA packets are flooded throughout the area, with each router forwarding LSA information on to any downstream devices. Every router then separately computes the best routing table based on this link state information.
If you prevented a router from forwarding some of the LSA information, its downstream routers would not have a full link state database, and consequently wouldn't be able to generate an accurate routing table.

julia childs on ospf...

if it cooks...

it's all about the chow...

julia loves cookin you up some lsa's...


no... please... not the mcgahan topology... anything but the mcgahan topology...
suffer...


none of the protocols are running...  all the good little ccnp candidates save their topologies with only the interfaces configured... right?

r1

router ospf 1
netw 0.0.0.0 255.255.255.255 area 0

r2

router ospf 1
netw 0.0.0.0 255.255.255.255 area 0

of course, only julia would cook up something like this

r2#sh ip ospf neigh

Neighbor ID     Pri   State           Dead Time   Address         Interface
1.1.1.1           1   FULL/BDR        00:00:33    10.1.1.1        FastEthernet0/0

cisco introduced using ospf on ipv4 interfaces with 12.3(11)T... smoke em if you got em... remove router ospf 1 on both... then...

r1#sh run int lo1
Building configuration...

Current configuration : 111 bytes
!
interface Loopback1
 ip address 1.1.1.1 255.255.255.0
 ip ospf network point-to-point
 ip ospf 1 area 0

r1#sh run int f0/0
Building configuration...

Current configuration : 99 bytes
!
interface FastEthernet0/0
 ip address 10.1.1.1 255.255.255.0
 ip ospf 1 area 0
 duplex full

r2#sh run int f0/0
Building configuration...

Current configuration : 99 bytes
!
interface FastEthernet0/0
 ip address 10.1.1.2 255.255.255.0
 ip ospf 1 area 0
 duplex full

r2#sh ip ospf neigh

Neighbor ID     Pri   State           Dead Time   Address         Interface
1.1.1.1           1   FULL/BDR        00:00:35    10.1.1.1        FastEthernet0/0

JULIA!!!

crookbook 6...

show eigrp's...

r1#sh ip proto
*** IP Routing is NSF aware ***

Routing Protocol is "eigrp 1"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP-IPv4 Protocol for AS(1)
    Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
    NSF-aware route hold timer is 240
    Router-ID: 1.1.1.1
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 4
      Maximum hopcount 100
      Maximum metric variance 1

  Automatic Summarization: disabled
  Address Summarization:
    192.168.1.0/28 for Se2/0
      Summarizing 2 components with metric 128256
    192.168.1.0/27 for Se2/0
      Summarizing 4 components with metric 128256
  Maximum path: 4
  Routing for Networks:
    1.0.0.0
    10.0.0.0
    192.168.1.0
  Routing Information Sources:
    Gateway         Distance      Last Update
    10.1.1.2              90      00:13:21
  Distance: internal 90 external 170

r1#sh ip route eigrp

Gateway of last resort is not set

      2.0.0.0/24 is subnetted, 1 subnets
D        2.2.2.0 [90/2297856] via 10.1.1.2, 04:53:05, Serial2/0
D EX  3.0.0.0/8 [170/2560512000] via 10.1.1.2, 00:14:24, Serial2/0
      4.0.0.0/24 is subnetted, 1 subnets
D EX     4.4.4.0 [170/2560512000] via 10.1.1.2, 00:14:24, Serial2/0
      172.16.0.0/24 is subnetted, 1 subnets
D EX     172.16.1.0 [170/2560512000] via 10.1.1.2, 00:14:24, Serial2/0
      192.168.1.0/24 is variably subnetted, 8 subnets, 4 masks
D        192.168.1.0/27 is a summary, 04:10:37, Null0
D        192.168.1.0/28 is a summary, 04:08:23, Null0

r1#sh ip eigrp neigh
EIGRP-IPv4 Neighbors for AS(1)
H   Address                 Interface              Hold Uptime   SRTT   RTO  Q  Seq
                                                   (sec)         (ms)       Cnt Num
0   10.1.1.2                Se2/0                    13 04:53:43   15   100  0  56

r1#sh ip eigrp int
EIGRP-IPv4 Interfaces for AS(1)
                              Xmit Queue   PeerQ        Mean   Pacing Time   Multicast    Pending
Interface              Peers  Un/Reliable  Un/Reliable  SRTT   Un/Reliable   Flow Timer   Routes
Se2/0                    1        0/0       0/0          15       0/15          71           0
Lo0                      0        0/0       0/0           0       0/0            0           0
Lo1                      0        0/0       0/0           0       0/0            0           0
Lo2                      0        0/0       0/0           0       0/0            0           0
Lo3                      0        0/0       0/0           0       0/0            0           0

r1#sh ip eigrp accounting
EIGRP-IPv4 Accounting for AS(1)/ID(1.1.1.1)
Total Prefix Count: 11  States: A-Adjacency, P-Pending, D-Down
State Address/Source          Interface                  Prefix   Restart  Restart/
                                                         Count     Count   Reset(s)

 A    10.1.1.2                Se2/0                         4        0        0

r1#sh ip eigrp topo
EIGRP-IPv4 Topology Table for AS(1)/ID(1.1.1.1)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 2.2.2.0/24, 1 successors, FD is 2297856
        via 10.1.1.2 (2297856/128256), Serial2/0
P 192.168.1.0/28, 1 successors, FD is 128256
        via Summary (128256/0), Null0
P 192.168.1.0/27, 1 successors, FD is 128256
        via Summary (128256/0), Null0
P 192.168.1.0/30, 1 successors, FD is 128256
        via Connected, Loopback1
P 192.168.1.16/30, 1 successors, FD is 128256
        via Connected, Loopback3
P 3.0.0.0/8, 1 successors, FD is 2560512000, tag is 5
        via 10.1.1.2 (2560512000/2560000000), Serial2/0
P 172.16.1.0/24, 1 successors, FD is 2560512000, tag is 5
        via 10.1.1.2 (2560512000/2560000000), Serial2/0
P 1.1.1.0/24, 1 successors, FD is 128256
        via Connected, Loopback0
P 10.1.1.0/24, 1 successors, FD is 2169856
        via Connected, Serial2/0
P 4.4.4.0/24, 1 successors, FD is 2560512000, tag is 5
        via 10.1.1.2 (2560512000/2560000000), Serial2/0
P 192.168.1.8/30, 1 successors, FD is 128256
        via Connected, Loopback2

you are in the show...

crookbook 5...

route tagging...  you can tag redistributed routes, external routes... it's very exciting...  you can tag them, and then look at the tags, and notice that they have tags... then you can look at the tags again...

i did mention you can notice the redistributed routes are tagged?

r1#sh ip eigrp topo 172.16.1.0/24
EIGRP-IPv4 Topology Entry for AS(1)/ID(1.1.1.1) for 172.16.1.0/24
  State is Passive, Query origin flag is 1, 1 Successor(s), FD is 2560512000
  Descriptor Blocks:
  10.1.1.2 (Serial2/0), from 10.1.1.2, Send flag is 0x0
      Composite metric is (2560512000/2560000000), route is External
      Vector metric:
        Minimum bandwidth is 1 Kbit
        Total delay is 20000 microseconds
        Reliability is 1/255
        Load is 1/255
        Minimum MTU is 1500
        Hop count is 1
        Originating router is 2.2.2.2
      External data:
        AS number of route is 0
        External protocol is RIP, external metric is 0
        Administrator tag is 0 (0x00000000)

without route tagging the route, you have the loser tag of 0...

since you don't want to be a tag loser, make some friggin tags...

use route-map conventions, start by permitting, as normal...

r2#sh access-list 1
Standard IP access list 1
    10 permit 172.16.1.0, wildcard bits 0.0.0.255
    20 permit any


r2#sh run | begin route-map
route-map ripper permit 10
 match ip address 1
 set tag 5

match the permitted ip address with the route map and set the tag to 5...

now add the route map to the redistribution statement...

r2(config)#router eigrp 1
r2(config-router)#redistrib rip metric 1 0 1 1 1500 route-map ripper

you are now a route tag winner...

r1#sh ip eigrp topo 172.16.1.0/24
EIGRP-IPv4 Topology Entry for AS(1)/ID(1.1.1.1) for 172.16.1.0/24
  State is Passive, Query origin flag is 1, 1 Successor(s), FD is 2560512000
  Descriptor Blocks:
  10.1.1.2 (Serial2/0), from 10.1.1.2, Send flag is 0x0
      Composite metric is (2560512000/2560000000), route is External
      Vector metric:
        Minimum bandwidth is 1 Kbit
        Total delay is 20000 microseconds
        Reliability is 1/255
        Load is 1/255
        Minimum MTU is 1500
        Hop count is 1
        Originating router is 2.2.2.2
      External data:
        AS number of route is 0
        External protocol is RIP, external metric is 0
        Administrator tag is 5 (0x00000005)

r1#sh ip eigrp topo
EIGRP-IPv4 Topology Table for AS(1)/ID(1.1.1.1)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 2.2.2.0/24, 1 successors, FD is 2297856
        via 10.1.1.2 (2297856/128256), Serial2/0
P 192.168.1.0/28, 1 successors, FD is 128256
        via Summary (128256/0), Null0
P 192.168.1.0/27, 1 successors, FD is 128256
        via Summary (128256/0), Null0
P 192.168.1.0/30, 1 successors, FD is 128256
        via Connected, Loopback1
P 192.168.1.16/30, 1 successors, FD is 128256
        via Connected, Loopback3
P 3.0.0.0/8, 1 successors, FD is 2560512000, tag is 5
        via 10.1.1.2 (2560512000/2560000000), Serial2/0
P 172.16.1.0/24, 1 successors, FD is 2560512000, tag is 5
        via 10.1.1.2 (2560512000/2560000000), Serial2/0
P 1.1.1.0/24, 1 successors, FD is 128256
        via Connected, Loopback0
P 10.1.1.0/24, 1 successors, FD is 2169856
        via Connected, Serial2/0
P 4.4.4.0/24, 1 successors, FD is 2560512000, tag is 5
        via 10.1.1.2 (2560512000/2560000000), Serial2/0
P 192.168.1.8/30, 1 successors, FD is 128256
        via Connected, Loopback2

admire your route tags now...

crookbook eigrp summ...

add loopbacks to r1... add auto-summary...

it is very contrived, suck it up...

interface Loopback1
 ip address 192.168.1.1 255.255.255.252
!
interface Loopback2
 ip address 192.168.1.9 255.255.255.252
!
interface Loopback3
 ip address 192.168.1.17 255.255.255.252

r2#sh ip route eigrp

Gateway of last resort is not set

D     1.0.0.0/8 [90/2297856] via 10.1.1.1, 00:00:16, Serial2/0
D     192.168.1.0/24 [90/2297856] via 10.1.1.1, 00:00:16, Serial2/0

auto summary makes summarization at the classful border...

lose it...

r2#sh ip route eigrp

Gateway of last resort is not set

      1.0.0.0/24 is subnetted, 1 subnets
D        1.1.1.0 [90/2297856] via 10.1.1.1, 00:00:11, Serial2/0
      192.168.1.0/30 is subnetted, 3 subnets
D        192.168.1.0 [90/2297856] via 10.1.1.1, 00:00:11, Serial2/0
D        192.168.1.8 [90/2297856] via 10.1.1.1, 00:00:11, Serial2/0
D        192.168.1.16 [90/2297856] via 10.1.1.1, 00:00:11, Serial2/0

and you get them all...

to summarize at the longest prefix, count...

0 to 16 includes 0 and that means 17, so the summary needs to be more than 16 and less than 32...  256 minus 32 = 224 or /24 + 3 or /27...

int s2/0
ip summary-add eigrp 1 192.168.1.0 255.255.255.224

r2#sh ip route eigrp

Gateway of last resort is not set

      1.0.0.0/24 is subnetted, 1 subnets
D        1.1.1.0 [90/2297856] via 10.1.1.1, 00:06:45, Serial2/0
      192.168.1.0/27 is subnetted, 1 subnets
D        192.168.1.0 [90/2297856] via 10.1.1.1, 00:00:16, Serial2/0

/28 doesn't get it...

int s2/0
ip summary-add eigrp 1 192.168.1.0 255.255.255.240

r2#sh ip route eigrp

Gateway of last resort is not set

      1.0.0.0/24 is subnetted, 1 subnets
D        1.1.1.0 [90/2297856] via 10.1.1.1, 00:09:25, Serial2/0
      192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks
D        192.168.1.0/27 [90/2297856] via 10.1.1.1, 00:02:56, Serial2/0
D        192.168.1.0/28 [90/2297856] via 10.1.1.1, 00:00:42, Serial2/0

this has been a public service announcement...

crookbook 4...

passive interface...

with eigrp if you set an interface to passive you will lose the adjacency on that interface...

r2(config)#router eigrp 1
r2(config-router)#passive-int s2/0
r2(config-router)#
*Sep 30 09:19:48: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 10.1.1.1 (Serial2/0) is down: interface passive

this might be useful if you want to shut down eigrp, without shutting down the network configuration...

also, using passive-interface default will shut it down for all interfaces, and then you can selectively enable it on a per interface basis with the no passive-interface (interface) command...

offset lists can be used to modify metrics... go for it...

timers:  i see no need changing the defaults... unlike ospf, mismatched timers in eigrp will not take down the adjacency, but expected delivery of hello's to the neighbor will be affected by the set time...

some things are better left alone...

it is no secret that i am not a fan of authentication, however...

r1

key chain suck-key
key 1
key-string suck-key

int s2/0
ip authentication mode eigrp 1 md5
ip authentication key-chain eigrp 1 suck-key

do it on both sides... if you must... of course it is de-testable...




crookbook part 3...

add a loopback on r2, and change the configuration to r3 into a rip network...


r2

int lo4
ip add 4.4.4.4 255.255.255.0

router eigrp 1
no netw 172.16.1.0 0.0.0.255

router rip
netw 172.16.0.0
netw 4.0.0.0

r3

no router eigrp 1

router rip
netw 172.16.0.0
netw 3.0.0.0

r2#sh ip route | ex L | inc loop
    
Gateway of last resort is not set

      1.0.0.0/24 is subnetted, 1 subnets
D        1.1.1.0 [90/2297856] via 10.1.1.1, 01:13:03, Serial2/0
      2.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        2.2.2.0/24 is directly connected, Loopback0
R     3.0.0.0/8 [120/1] via 172.16.1.3, 00:00:15, FastEthernet0/0
      4.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        4.4.4.0/24 is directly connected, Loopback4
      10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        10.1.1.0/24 is directly connected, Serial2/0
      172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C        172.16.1.0/24 is directly connected, FastEthernet0/0

redistribute rip into eigrp and eigrp into rip...

r2

router rip
redistribute eigrp 1 metric 5

router eigrp 1
redistribute rip metric 1 0 1 1 1500

r3#sh ip route | ex L | incl loop
      
Gateway of last resort is not set

R     1.0.0.0/8 [120/5] via 172.16.1.2, 00:00:25, FastEthernet0/0
R     2.0.0.0/8 [120/5] via 172.16.1.2, 00:00:25, FastEthernet0/0
      3.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        3.3.3.0/24 is directly connected, Loopback0
R     4.0.0.0/8 [120/1] via 172.16.1.2, 00:00:25, FastEthernet0/0
R     10.0.0.0/8 [120/5] via 172.16.1.2, 00:00:25, FastEthernet0/0
      172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C        172.16.1.0/24 is directly connected, FastEthernet0/0

note the redistributed eigrp routes are signified by R on the rip router...

while it is a different story on r1...

r1#sh ip route | exc L | inc loop
    
Gateway of last resort is not set

      1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        1.1.1.0/24 is directly connected, Loopback0
      2.0.0.0/24 is subnetted, 1 subnets
D        2.2.2.0 [90/2297856] via 10.1.1.2, 01:23:54, Serial2/0
D EX  3.0.0.0/8 [170/2560512000] via 10.1.1.2, 00:06:05, Serial2/0
      4.0.0.0/24 is subnetted, 1 subnets
D EX     4.4.4.0 [170/2560512000] via 10.1.1.2, 00:06:05, Serial2/0
      10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        10.1.1.0/24 is directly connected, Serial2/0
      172.16.0.0/24 is subnetted, 1 subnets
D EX     172.16.1.0 [170/2560512000] via 10.1.1.2, 00:06:05, Serial2/0

do the metrics really matter?

i'll let the crookbook satisfy that..

  EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0

EIGRP uses these K values as coefficients in an involved equation that specifies how to combine all of these different individual metrics into a single numerical value, the composite EIGRP metric. You will notice that only K1 and K3 are nonzero. The result is that, by default, EIGRP uses only bandwidth and delay when computing its metric. So, in fact, you can generally fill in just about anything for the other parameters in the default-metric command, and it won't make any difference.
We note as an aside that while you can change these different K values by using the metric weights command, we strongly advise against changing the defaults. These values were of some use in IGRP, and when Cisco introduced EIGRP, with its superior DUAL algorithm, they carried the parameters forward. However, it was discovered that in practice it was relatively easy to make routing extremely unstable by changing them. And it's almost impossible to make things any better by changing these weight values in EIGRP.

so there...

eigrp crookbook eigrp 02...

add another router...


add to eigrp 1

r2

router eigrp 1
netw 172.16.1.0 0.0.0.255

r3

router eigrp 1
netw 172.16.1.0 0.0.0.255
netw 3.0.0.0

r3(config-router)#
*Sep 30 07:23:29: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 172.16.1.2 (FastEthernet0/0) is up: new adjacency

r1#sh ip route eigrp

Gateway of last resort is not set

      2.0.0.0/24 is subnetted, 1 subnets
D        2.2.2.0 [90/2297856] via 10.1.1.2, 00:24:40, Serial2/0
      3.0.0.0/24 is subnetted, 1 subnets
D        3.3.3.0 [90/2300416] via 10.1.1.2, 00:01:03, Serial2/0
      172.16.0.0/24 is subnetted, 1 subnets
D        172.16.1.0 [90/2172416] via 10.1.1.2, 00:01:45, Serial2/0

filter r3's loopback...

r2(config)#access-list 1 deny 3.3.3.0
r2(config)#access-list 1 permit any
r2(config)#router eigrp 1
r2(config-router)#distribute-list 1 in f0/0

this filters the loopback incoming to r2, and permits the rest...

r1#sh ip route eigrp

Gateway of last resort is not set

      2.0.0.0/24 is subnetted, 1 subnets
D        2.2.2.0 [90/2297856] via 10.1.1.2, 00:27:55, Serial2/0
      172.16.0.0/24 is subnetted, 1 subnets
D        172.16.1.0 [90/2172416] via 10.1.1.2, 00:05:00, Serial2/0

r3#sh ip route eigrp

Gateway of last resort is not set

      1.0.0.0/24 is subnetted, 1 subnets
D        1.1.1.0 [90/2300416] via 172.16.1.2, 00:06:58, FastEthernet0/0
      2.0.0.0/24 is subnetted, 1 subnets
D        2.2.2.0 [90/156160] via 172.16.1.2, 00:06:58, FastEthernet0/0
      10.0.0.0/24 is subnetted, 1 subnets
D        10.1.1.0 [90/2172416] via 172.16.1.2, 00:06:58, FastEthernet0/0

you can do the same outgoing from r2 to r3... we'll drop the advertisement to r3 of r1's loopback...

r2(config)#access-list 2 deny 1.1.1.0
r2(config)#access-list 2 permit any
r2(config)#router eigrp 1
r2(config-router)#distribute-list 2 out f0/0

r3#sh ip route eigrp

Gateway of last resort is not set

      2.0.0.0/24 is subnetted, 1 subnets
D        2.2.2.0 [90/156160] via 172.16.1.2, 00:11:05, FastEthernet0/0
      10.0.0.0/24 is subnetted, 1 subnets
D        10.1.1.0 [90/2172416] via 172.16.1.2, 00:11:05, FastEthernet0/0

r2#sh ip proto
*** IP Routing is NSF aware ***

Routing Protocol is "eigrp 1"
  Outgoing update filter list for all interfaces is not set
    FastEthernet0/0 filtered by 2 (per-user), default is not set
  Incoming update filter list for all interfaces is not set
    FastEthernet0/0 filtered by 1 (per-user), default is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP-IPv4 Protocol for AS(1)
    Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
    NSF-aware route hold timer is 240
    Router-ID: 2.2.2.2
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 4
      Maximum hopcount 100
      Maximum metric variance 1

  Automatic Summarization: disabled
  Maximum path: 4
  Routing for Networks:
    2.0.0.0
    10.0.0.0
    172.16.1.0/24
  Routing Information Sources:
    Gateway         Distance      Last Update
    10.1.1.1              90      00:09:00
    172.16.1.3            90      00:03:39
  Distance: internal 90 external 170

prefix lists are mostly used to filter eigrp with bgp and the converse... we'll get to that later...

ios crookbook...

over the years i've spent a wad of cash on network books and training materials.  most i still have, others have gotten away... in the last few months cisco has been offering ebooks at cisco press for a very reduced rate... i have bought quite a few, and while i used to prefer hard copy, i have come to appreciate the portability of pdf, especially the ease with which i can scrape important pieces into anki for long term study...

i bumped into ios cookbook a while back, and with your friendly neighborhood google, you can find what appears to be a bootleg  online... i think it's in china or some shit, and i don't really care... if it's online, feel free to use it i say, and let the publishers go after the crooks... that's not my concern, and i don't make any money from any of this anyway...

there are many sections in the so called cookbooks, and they cut directly to the chase for configurations purposes... this seems useful... i decided to go through it starting with the routing protocol sections as a structured practice...

i'll start with eigrp... this is meant for those who have already been through the theory of the major concerns presented in numerous ways by many more adept  than myself... as usual, i'll start at the beginning and follow through...

simple eigrp...



r1

int lo0
ip add 1.1.1.1 255.255.255.0

int s2/0
ip add 10.1.1.1 255.255.255.0
clock rate 128000
no shut

router eigrp 1

netw 10.0.0.0
netw 1.0.0.0
no auto-summ

r2

int lo0
ip add 2.2.2.2 255.255.255.0

int s2/0
ip add 10.1.1.2 255.255.255.0
clock rate 128000
no shut

router eigrp 1
netw 2.0.0.0
no auto-summ

the code i have for the routers in gns3 uses no auto-summary by default... i will not be typing that again...

the router-id is selected using the same precedence as ospf... or you could manually configure it as well... wildcards can also be used in the network statements...


r2#sh ip eigrp topo
EIGRP-IPv4 Topology Table for AS(1)/ID(2.2.2.2)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 2.2.2.0/24, 1 successors, FD is 128256
        via Connected, Loopback0
P 1.1.1.0/24, 1 successors, FD is 2297856
        via 10.1.1.1 (2297856/128256), Serial2/0
P 10.1.1.0/24, 1 successors, FD is 2169856
        via Connected, Serial2/0

r1#sh ip proto
*** IP Routing is NSF aware ***

Routing Protocol is "eigrp 1"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP-IPv4 Protocol for AS(1)
    Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
    NSF-aware route hold timer is 240
    Router-ID: 1.1.1.1
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 4
      Maximum hopcount 100
      Maximum metric variance 1

  Automatic Summarization: disabled
  Maximum path: 4
  Routing for Networks:
    1.0.0.0
    10.0.0.0
  Routing Information Sources:
    Gateway         Distance      Last Update
    10.1.1.2              90      00:03:24
  Distance: internal 90 external 170

note default k values 1 0 1 0 0...

r2#sh ip route eigrp
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is not set

      1.0.0.0/24 is subnetted, 1 subnets
D        1.1.1.0 [90/2297856] via 10.1.1.1, 00:05:47, Serial2/0

r1#sh ip eigrp neigh
EIGRP-IPv4 Neighbors for AS(1)
H   Address                 Interface              Hold Uptime   SRTT   RTO  Q  Seq
                                                   (sec)         (ms)       Cnt Num
0   10.1.1.2                Se2/0                    11 00:19:23   13   100  0  7

next...


Saturday, September 29, 2012

quote of the day, doyle, dv versus path vector...


from ospf and is-is, jeff doyle


All of the vector protocols with the exception of BGP are commonly called distance vector protocols. BGP is called a path vector protocol, because it tracks not paths through routers but paths through autonomous systems. Is there really any difference between distance vector and path vector? At least one acquaintance likes to differentiate them by saying that a distance vector route is a sum of quantities, whereas path vector is a sequence of quantities. My own opinion is that it is all semantics. Although BGP has a different application than an IGP, and does indeed describe its routes as a series of AS numbers, it is still a distance vector protocol.

lsa flooding clarification...

the term flooding has a connotation that is misleading concerning lsa's...

according to doyle:

A router originates a link-state advertisement to describe one or more destinations. An OSPF Update packet transports LSAs from one neighbor to another. Although LSAs are flooded throughout an area or OSPF domain, Update packets never leave a data link.

this is correct, but vague...

lsa's are contained in update packets that are exchanged between routers that share the same data link, but the update packets themselves never leave the link... this is the finer point..

doyle does better in his book,  OSPF and IS-IS: Choosing an IGP for Large-Scale Networks:

OSPF uses an Update packet to send LSAs from one router to another during the flooding process. Whereas LSAs are flooded throughout an area, Update packets are exchanged only between directly connected routers. That is, their scope is the local link. If an LSA received in an Update packet must be forwarded to another router, it is put into a new Update packet for the next hop. This is in keeping with the fact that none of the five OSPF message types are forwarded beyond the local link.




Friday, September 28, 2012

n(n-1)/2...

it is real...

because i'm insane i had to count them...

start from the outside with 1 and count clockwise towards the inside... it's actually not easy...

or count the routers as in the formula... n = router

6(6-1)/2
6(5)/2
30/2
15

Wednesday, September 26, 2012

ipv6 tunnel...

tunneling ipv6 through ipv4...

establish connectivity with an ospf network, as below...



variations on a theme...

r1#sh run int tun 0
Building configuration...

Current configuration : 136 bytes
!
interface Tunnel0
 no ip address
 ipv6 address 2001::1/64
 ipv6 ospf 1 area 0
 tunnel source 1.1.1.1
 tunnel destination 2.2.2.2

r2# sh run int tun 0
Building configuration...

Current configuration : 136 bytes
!
interface Tunnel0
 no ip address
 ipv6 address 2001::2/64
 ipv6 ospf 1 area 0
 tunnel source 2.2.2.2
 tunnel destination 1.1.1.1

it's really that easy after you've built ospf...

r1#sh ipv6 int tun 0
Tunnel0 is up, line protocol is up
  IPv6 is enabled, link-local address is FE80::C80A:61FF:FEA8:8
  No Virtual link-local address(es):
  Global unicast address(es):
    2001::1, subnet is 2001::/64
  Joined group address(es):
    FF02::1
    FF02::2
    FF02::5
    FF02::1:FF00:1
    FF02::1:FFA8:8
  MTU is 1476 bytes
  ICMP error messages limited to one every 100 milliseconds
  ICMP redirects are enabled
  ICMP unreachables are sent
  ND DAD is enabled, number of DAD attempts: 1
  ND reachable time is 30000 milliseconds (using 30000)
  ND RAs are suppressed (periodic)
  Hosts use stateless autoconfig for addresses.

r2#sh inter tun 0
Tunnel0 is up, line protocol is up
  Hardware is Tunnel
  MTU 17916 bytes, BW 100 Kbit/sec, DLY 50000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation TUNNEL, loopback not set
  Keepalive not set
  Tunnel source 2.2.2.2, destination 1.1.1.1
  Tunnel protocol/transport GRE/IP
    Key disabled, sequencing disabled
    Checksumming of packets disabled
  Tunnel TTL 255, Fast tunneling enabled
  Tunnel transport MTU 1476 bytes
  Tunnel transmit bandwidth 8000 (kbps)
  Tunnel receive bandwidth 8000 (kbps)
  Last input 00:00:04, output 00:00:06, output hang never
  Last clearing of "show interface" counters 00:14:14
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/0 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     98 packets input, 10264 bytes, 0 no buffer
     Received 0 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     109 packets output, 11472 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 unknown protocol drops
     0 output buffer failures, 0 output buffers swapped out


Monday, September 24, 2012

ipv6 lovin spoonful...


slam some eigrp up in there...

r3

ipv6 router eigrp 1
router-id 3.3.3.3

int lo0
ipv6 route eigrp 1

int f0/1
ipv6 eigrp 1

r4
ipv6 unicast-rout
ipv6 cef

ipv6 router eigrp 1
router-id 4.4.4.4

int lo0
ipv6 eigrp 1

int f0/1
ipv6 eigrp 1


r3#sh ipv6 route eigrp
IPv6 Routing Table - default - 11 entries
Codes: C - Connected, L - Local, S - Static, U - Per-user Static route
       B - BGP, R - RIP, H - NHRP, I1 - ISIS L1
       I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary, D - EIGRP
       EX - EIGRP external, ND - ND Default, NDp - ND Prefix, DCE - Destination
       NDr - Redirect, O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1
       OE2 - OSPF ext 2, ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2, l - LISP
D   2004:4444::/64 [90/156160]
     via FE80::C809:BFF:FEF0:6, FastEthernet0/1
r4#sh ipv6 route eigrp
IPv6 Routing Table - default - 6 entries
Codes: C - Connected, L - Local, S - Static, U - Per-user Static route
       B - BGP, R - RIP, H - NHRP, I1 - ISIS L1
       I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary, D - EIGRP
       EX - EIGRP external, ND - ND Default, NDp - ND Prefix, DCE - Destination
       NDr - Redirect, O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1
       OE2 - OSPF ext 2, ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2, l - LISP
D   2003:3333::/64 [90/156160]
     via FE80::C808:BFF:FEF0:6, FastEthernet0/1

and do the redist dance

r3

ipv6 router eigrp 1
redist ospf 1 metric 5 1 1 1 1500 include-conn

ipv6 router ospf 1
redist eigrp 1 include-conn

r1#sh ipv6 route | ex L
IPv6 Routing Table - default - 8 entries
       EX - EIGRP external, ND - ND Default, NDp - ND Prefix, DCE - Destination
       NDr - Redirect, O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1
C   2001::/64 [0/0]
     via Serial1/0, directly connected
     via Serial1/0, receive
C   2001:1111::/64 [0/0]
R   2003::/64 [120/6]
     via FE80::C806:BFF:FEF0:8, Serial1/0
R   2003:3333::1/128 [120/6]
     via FE80::C806:BFF:FEF0:8, Serial1/0
R   2004:4444::/64 [120/6]
     via FE80::C806:BFF:FEF0:8, Serial1/0
     via Null0, receive

r2#sh ipv6 route | ex L
IPv6 Routing Table - default - 11 entries
       EX - EIGRP external, ND - ND Default, NDp - ND Prefix, DCE - Destination
       NDr - Redirect, O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1
C   2001::/64 [0/0]
     via Serial1/0, directly connected
     via Serial1/0, receive
R   2001:1111::/64 [120/2]
     via FE80::C805:BFF:FEF0:8, Serial1/0
C   2002::/64 [0/0]
     via FastEthernet0/0, directly connected
     via FastEthernet0/0, receive
C   2002:2222::/64 [0/0]
OE2 2003::/64 [110/20]
     via FE80::C808:BFF:FEF0:8, FastEthernet0/0
O   2003:3333::1/128 [110/1]
     via FE80::C808:BFF:FEF0:8, FastEthernet0/0
OE2 2004:4444::/64 [110/20]
     via FE80::C808:BFF:FEF0:8, FastEthernet0/0
     via Null0, receive

r3#sh ipv6 route | ex L
IPv6 Routing Table - default - 11 entries
       EX - EIGRP external, ND - ND Default, NDp - ND Prefix, DCE - Destination
       NDr - Redirect, O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1
OE2 2001::/64 [110/20]
     via FE80::C806:BFF:FEF0:8, FastEthernet0/0
OE2 2001:1111::/64 [110/20]
     via FE80::C806:BFF:FEF0:8, FastEthernet0/0
C   2002::/64 [0/0]
     via FastEthernet0/0, directly connected
     via FastEthernet0/0, receive
O   2002:2222::1/128 [110/1]
     via FE80::C806:BFF:FEF0:8, FastEthernet0/0
C   2003::/64 [0/0]
     via FastEthernet0/1, directly connected
     via FastEthernet0/1, receive
C   2003:3333::/64 [0/0]
D   2004:4444::/64 [90/156160]
     via FE80::C809:BFF:FEF0:6, FastEthernet0/1
     via Null0, receive

 r4#sh ipv6 route | ex L
IPv6 Routing Table - default - 10 entries
       EX - EIGRP external, ND - ND Default, NDp - ND Prefix, DCE - Destination
       NDr - Redirect, O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1
EX  2001::/64 [170/512002816]
     via FE80::C808:BFF:FEF0:6, FastEthernet0/1
EX  2001:1111::/64 [170/512002816]
     via FE80::C808:BFF:FEF0:6, FastEthernet0/1
EX  2002::/64 [170/512002816]
     via FE80::C808:BFF:FEF0:6, FastEthernet0/1
EX  2002:2222::1/128 [170/512002816]
     via FE80::C808:BFF:FEF0:6, FastEthernet0/1
C   2003::/64 [0/0]
     via FastEthernet0/1, directly connected
     via FastEthernet0/1, receive
D   2003:3333::/64 [90/156160]
     via FE80::C808:BFF:FEF0:6, FastEthernet0/1
C   2004:4444::/64 [0/0]
     via Null0, receive

r1#ping ipv6 2004:4444::1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2004:4444::1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/11/24 ms
r1#

that deserves this...


ipv6 love cont...

you know what's coming...


configure ospf area 0 between r2 and r3...

r2

ipv6 router ospf 1
router-id 2.2.2.2

int lo0
ipv6 ospf 1 area 0

int f0/0
ipv6 ospf 1 area 0

r3

ipv6 router ospf 1
router-id 3.3.3.3

int lo0
ipv6 ospf 1 area 0

int f0/0
ipv6 ospf 1 area 0


that was easy...

r2#sh ipv6 ospf neigh

            OSPFv3 Router with ID (2.2.2.2) (Process ID 1)

Neighbor ID     Pri   State           Dead Time   Interface ID    Interface
3.3.3.3           1   FULL/DR         00:00:37    2               FastEthernet0/0



r3#sh ipv6 ospf neigh

            OSPFv3 Router with ID (3.3.3.3) (Process ID 1)

Neighbor ID     Pri   State           Dead Time   Interface ID    Interface
2.2.2.2           1   FULL/BDR        00:00:32    2               FastEthernet0/0

add ripNg to r1

ipv6 router rip ripper

int lo0
ipv6 rip ripper enable
int s1/0
ipv6 rip ripper enable

and add ripNg to r2

ipv6 router rip ripper


int s1/0
ipv6 rip ripper enable

r2#sh ipv6 route | excl L
IPv6 Routing Table - default - 9 entries
       EX - EIGRP external, ND - ND Default, NDp - ND Prefix, DCE - Destination
       NDr - Redirect, O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1
C   2001::/64 [0/0]
     via Serial1/0, directly connected
     via Serial1/0, receive
R   2001:1111::/64 [120/2]
     via FE80::C805:BFF:FEF0:8, Serial1/0
C   2002::/64 [0/0]
     via FastEthernet0/0, directly connected
     via FastEthernet0/0, receive
C   2002:2222::/64 [0/0]
O   2003:3333::1/128 [110/1]
     via FE80::C808:BFF:FEF0:8, FastEthernet0/0
     via Null0, receive

r1#sh ipv6 route | excl L
IPv6 Routing Table - default - 5 entries
       EX - EIGRP external, ND - ND Default, NDp - ND Prefix, DCE - Destination
       NDr - Redirect, O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1
C   2001::/64 [0/0]
     via Serial1/0, directly connected
     via Serial1/0, receive
C   2001:1111::/64 [0/0]
     via Null0, receive

go ahead and redistribute rip into ospf and ospf into rip...

r2

ipv6 router ospf 1
redistrib rip ripper include-conn

ipv6 router rip ripper
redistrib ospf 1 metric 5

r1#sh ipv6 route | excl L
IPv6 Routing Table - default - 6 entries
       EX - EIGRP external, ND - ND Default, NDp - ND Prefix, DCE - Destination
       NDr - Redirect, O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1
C   2001::/64 [0/0]
     via Serial1/0, directly connected
     via Serial1/0, receive
C   2001:1111::/64 [0/0]
R   2003:3333::1/128 [120/6]
     via FE80::C806:BFF:FEF0:8, Serial1/0
     via Null0, receive

r3#sh ipv6 route | excl L
IPv6 Routing Table - default - 10 entries
       EX - EIGRP external, ND - ND Default, NDp - ND Prefix, DCE - Destination
       NDr - Redirect, O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1
OE2 2001::/64 [110/20]
     via FE80::C806:BFF:FEF0:8, FastEthernet0/0
OE2 2001:1111::/64 [110/20]
     via FE80::C806:BFF:FEF0:8, FastEthernet0/0
C   2002::/64 [0/0]
     via FastEthernet0/0, directly connected
     via FastEthernet0/0, receive
O   2002:2222::1/128 [110/1]
     via FE80::C806:BFF:FEF0:8, FastEthernet0/0
C   2003::/64 [0/0]
     via FastEthernet0/1, directly connected
     via FastEthernet0/1, receive
C   2003:3333::/64 [0/0]
     via Null0, receive

having fun yet?