ine lab... from their site...

http://blog.ine.com/2011/04/04/understanding-ospf-external-route-path-selection/

from brian mcgahan...  this looks like a nice continuation for where that last lab was going...

Intra-Area (O)
Inter-Area (O IA)
External Type 1 (E1)
External Type 2 (E2)
NSSA Type 1 (N1)
NSSA Type 2 (N2)

this is the order of preference...





there's some things i want to look at here... but i'm changing the numbers...

does my ass look big in these ellipses?

r1

int lo1
ip add 1.1.1.1 255.255.255.0

int f0/0
ip add 10.1.1.1 255.255.255.0
no shut

int f1/1
ip add 10.1.2.1 255.255.255.0
no shut

r2

int f0/0
ip add 10.1.1.2 255.255.255.0
no shut

int s1/1
ip add 192.168.1.1 255.255.255.0
clock rat 128000
band 128
no shut

r3

int f0/0
ip add 10.1.2.2 255.255.255.0
no shut

int s1/1
ip add  192.168.2.1 255.255.255.0
clock rat 128000
band 128
no shut

r4

int s1/1
ip add 192.168.1.2 255.255.255.0
band 128
no shut

int f0/0
ip add 172.16.1.2 255.255.255.0
no shut

r5

int s1/1
ip add 192.168.2.2 255.255.255.0
band 128
no shut

int f0/0
ip add 172.16.2.2 255.255.255.0
no shut

r6

int lo6
ip add 6.6.6.6 255.255.255.0

int f0/0
ip add 172.16.1.1 255.255.255.0
no shut

int f0/1
ip add 172.16.2.1 255.255.255.0
no shut

there you have it... link ping... yeah they work...

i didn't get the perspective too well... his diagram is cooler...

add the routing protocols...i'm not doing it for you... i purposely don't save after the interfaces are built for practice later... right... riiiiiiiiiiiiiigggghhhhhtttt..

r1#sh ip route | excl l | incl 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, 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, 00:20:06, FastEthernet0/0
O IA  192.168.2.0/24 [110/782] via 10.1.2.2, 00:01:04, FastEthernet1/1

r1#ping 192.168.1.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/12/16 ms
r1#ping 192.168.2.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.2.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/8/8 ms

r1#ping 192.168.1.2 source 1.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.2, timeout is 2 seconds:
Packet sent with a source address of 1.1.1.1
!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 8/8/8 ms
r1#ping 192.168.2.2 source 1.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.2.2, timeout is 2 seconds:
Packet sent with a source address of 1.1.1.1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/8/8

so this is very nice and there's a lot to do here... thanks, brian mcgahan...
make the ospf loopback a point-to-point network so it is perceived as a network, not a host...

r2#sh ip route 1.1.1.1
Routing entry for 1.1.1.0/24
  Known via "ospf 1", distance 110, metric 2, type intra area
  Last update from 10.1.1.1 on FastEthernet0/0, 00:27:44 ago
  Routing Descriptor Blocks:
  * 10.1.1.1, from 1.1.1.1, 00:27:44 ago, via FastEthernet0/0
      Route metric is 2, traffic share count is 1

r4#sh run | beg router
router eigrp 1
 network 172.16.0.0
 redistribute ospf 1 metric 1000 1 1 255 1500

i made r4 and r5 the same for now...

r6#sh ip route | excl L | inc loop                   
      

Gateway of last resort is not set

      1.0.0.0/24 is subnetted, 1 subnets
D EX     1.1.1.0 [170/2562816] via 172.16.2.2, 00:03:17, FastEthernet0/1
                 [170/2562816] via 172.16.1.2, 00:03:17, FastEthernet0/0
      6.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        6.6.6.0/24 is directly connected, Loopback6
      10.0.0.0/24 is subnetted, 2 subnets
D EX     10.1.1.0 [170/2562816] via 172.16.2.2, 00:03:17, FastEthernet0/1
                  [170/2562816] via 172.16.1.2, 00:03:17, FastEthernet0/0
D EX     10.1.2.0 [170/2562816] via 172.16.2.2, 00:03:17, FastEthernet0/1
                  [170/2562816] via 172.16.1.2, 00:03:17, FastEthernet0/0
      172.16.0.0/16 is variably subnetted, 4 subnets, 2 masks
C        172.16.1.0/24 is directly connected, FastEthernet0/0
C        172.16.2.0/24 is directly connected, FastEthernet0/1
D EX  192.168.1.0/24 [170/2562816] via 172.16.2.2, 00:03:17, FastEthernet0/1
                     [170/2562816] via 172.16.1.2, 00:03:17, FastEthernet0/0
D EX  192.168.2.0/24 [170/2562816] via 172.16.2.2, 00:03:17, FastEthernet0/1
                     [170/2562816] via 172.16.1.2, 00:03:17, FastEthernet0/0


r1#sh ip route | excl L | incl 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, Loopback1
      10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
C        10.1.1.0/24 is directly connected, FastEthernet0/0
C        10.1.2.0/24 is directly connected, FastEthernet1/1
O IA  192.168.1.0/24 [110/782] via 10.1.1.2, 00:54:47, FastEthernet0/0
O IA  192.168.2.0/24 [110/782] via 10.1.2.2, 00:35:45, FastEthernet1/1

redist eigrp 1 subnets

r1#sh ip route | excl L | incl 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, Loopback1
      6.0.0.0/24 is subnetted, 1 subnets
O E2     6.6.6.0 [110/20] via 10.1.1.2, 00:00:08, FastEthernet0/0
      10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
C        10.1.1.0/24 is directly connected, FastEthernet0/0
C        10.1.2.0/24 is directly connected, FastEthernet1/1
      172.16.0.0/24 is subnetted, 2 subnets
O E2     172.16.1.0 [110/20] via 10.1.1.2, 00:00:08, FastEthernet0/0
O E2     172.16.2.0 [110/20] via 10.1.1.2, 00:00:08, FastEthernet0/0
O IA  192.168.1.0/24 [110/782] via 10.1.1.2, 00:55:37, FastEthernet0/0
O IA  192.168.2.0/24 [110/782] via 10.1.2.2, 00:36:35, FastEthernet1/1

do it for both r4 and r5...

r1#sh ip route | excl L | incl 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, Loopback1
      6.0.0.0/24 is subnetted, 1 subnets
O E2     6.6.6.0 [110/20] via 10.1.2.2, 00:02:49, FastEthernet1/1
                 [110/20] via 10.1.1.2, 00:04:32, FastEthernet0/0
      10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
C        10.1.1.0/24 is directly connected, FastEthernet0/0
C        10.1.2.0/24 is directly connected, FastEthernet1/1
      172.16.0.0/24 is subnetted, 2 subnets
O E2     172.16.1.0 [110/20] via 10.1.2.2, 00:02:49, FastEthernet1/1
                    [110/20] via 10.1.1.2, 00:04:32, FastEthernet0/0
O E2     172.16.2.0 [110/20] via 10.1.2.2, 00:02:49, FastEthernet1/1
                    [110/20] via 10.1.1.2, 00:04:32, FastEthernet0/0
O IA  192.168.1.0/24 [110/782] via 10.1.1.2, 01:00:01, FastEthernet0/0
O IA  192.168.2.0/24 [110/782] via 10.1.2.2, 00:40:59, FastEthernet1/1

r1#ping 6.6.6.6
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 6.6.6.6, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/12/16 ms

the redistribution is exactly the same for r4 and r5... the output has not changed with the inclusion of r5 above...

with this basic redistribution i want to examine the path the traffic takes... press the record button...

r6#ping
Protocol [ip]:
Target IP address: 1.1.1.1
Repeat count [5]: 1
Datagram size [100]:
Timeout in seconds [2]:
Extended commands [n]: y
Source address or interface: 6.6.6.6
Type of service [0]:
Set DF bit in IP header? [no]:
Validate reply data? [no]:
Data pattern [0xABCD]:
Loose, Strict, Record, Timestamp, Verbose[none]: record
Number of hops [ 9 ]:
Loose, Strict, Record, Timestamp, Verbose[RV]:
Sweep range of sizes [n]:
Type escape sequence to abort.
Sending 1, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
Packet sent with a source address of 6.6.6.6
Packet has IP options:  Total option bytes= 39, padded length=40
 Record route: <*>
   (0.0.0.0)
   (0.0.0.0)
   (0.0.0.0)
   (0.0.0.0)
   (0.0.0.0)
   (0.0.0.0)
   (0.0.0.0)
   (0.0.0.0)
   (0.0.0.0)

Reply to request 0 (44 ms).  Received packet has options
 Total option bytes= 40, padded length=40
 Record route:
   (172.16.2.1)
   (192.168.2.2)
   (10.1.2.2)
   (10.1.2.1)
   (10.1.1.1)
   (192.168.1.1)
   (172.16.1.2)
   (172.16.1.1) <*>
   (0.0.0.0)
 End of list

the record feature is sweet... look at the path...

it makes a round trip from r6-->r5-->r3-->r1 then back r2--r4--r6... out on the odd's, in on the even's...

i have network wood, and if you don't, go be a server guy or something...

you can see the world like this:

yuck...