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Showing posts with label redistribution. Show all posts
Showing posts with label redistribution. Show all posts

Monday, October 1, 2012

cookbook flashy redist...


restart the topology to get rid of all the boogers...

r1#sh ip ospf
r1#

a clean slate...

add ospf area 0 to r1 and r2, ospf area 1 to r2 and r4, and eigrp 1 to r4 and r6, on the proper interfaces... don't forget the loopbacks...

if you watched your adjacencie's come up,  you already verified... but...

r1#sh ip route ospf

Gateway of last resort is not set

O IA  192.168.1.0/24 [110/782] via 10.1.1.2, 00:03:36, FastEthernet0/0

r4#sh ip route eigrp

Gateway of last resort is not set

      6.0.0.0/24 is subnetted, 1 subnets
D        6.6.6.0 [90/156160] via 172.16.1.1, 00:02:14, FastEthernet0/0

i just love a good reusable topology...

redistribute both ways...

 router eigrp 1
 network 172.16.1.0 0.0.0.255
 redistribute ospf 1 metric 1 0 1 1 1500

router ospf 1
 redistribute eigrp 1 subnets
 network 192.168.1.0 0.0.0.255 area 1

r1#sh ip route ospf

Gateway of last resort is not set

      6.0.0.0/24 is subnetted, 1 subnets
O E2     6.6.6.0 [110/20] via 10.1.1.2, 00:01:19, FastEthernet0/0
      172.16.0.0/24 is subnetted, 1 subnets
O E2     172.16.1.0 [110/20] via 10.1.1.2, 00:01:19, FastEthernet0/0
O IA  192.168.1.0/24 [110/782] via 10.1.1.2, 00:10:08, FastEthernet0/0

r6#sh ip route eigrp

Gateway of last resort is not set

      1.0.0.0/24 is subnetted, 1 subnets
D EX     1.1.1.0 [170/2560002560] via 172.16.1.2, 00:07:18, FastEthernet0/0
      10.0.0.0/24 is subnetted, 1 subnets
D EX     10.1.1.0 [170/2560002560] via 172.16.1.2, 00:07:18, FastEthernet0/0
D EX  192.168.1.0/24
           [170/2560002560] via 172.16.1.2, 00:07:18, FastEthernet0/0

now, just because it sucks so bad, put authentication between all ospf neighbors, and the eigrp neighbors...

int f0/0
ip ospf authenti  message-digest
ip ospf authentication-key suck-key

and watch the adjacencies go down...

then do it on the serials...

int s1/1
ip ospf authenti message
ip ospf authentication-k suck-key

note: key chains are used for eigrp and rip only... ospf authenticates differently, as seen above...

eigrp

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

int f0/0
ip authenti mode eigrp 1 md5
ip authent key-chain eigrp 1 suck-key

and watch them come back up... ospf and eigrp are configured differently...  of course they are... and you just have to memorize this garbage...

it is an awful lot of effort for so little... but this is the life we have chosen, so suck it up... for me, i will have to force myself to put a nasty key chain on every adjacency i make so it is burned in my brain... this is one spot where points could be easily lost, and time wasted...

Monday, September 3, 2012

lsa types, or...

coming to grips with said...

i always seem to forget type 4, summary asbr... i think humans have a natural aversion to this type...



1 is easy router type
2 is easy network type
3 is easy summary net


back to our old friend, the mcgahan topology, with redistribution currently shut down on r4 and r5...

the view of the network from r1 can be counted on as a baseline...

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, 00:09:00, FastEthernet0/0
O IA  192.168.2.0/24 [110/782] via 10.1.2.2, 00:09:00, FastEthernet1/1

this gives us hope... area 0 is bounded by area 1, and is duly noted in the route table...

we can get to the outermost reaches of area 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 = 4/9/20 ms

the ospf database also tells us this...


r2 and r3 are transit areas creating the summary net advertisements, as well as performing dr duty...


note that r4 and r5, neither transit nor dr,  do not exhibit type 2's...


so we turn on basic redistribution on r4 and r5 from eigrp 1 and watch the fireworks...

type 4's show up on r1 now, and of course type 5's...
note that the advertising routers are r2 and r3 from r1's perspective...

r2 claims responsibility for propagating the type 4's...


and r4 (one of the asbr's) is in complete agreement...



look especially hard at the summary asb (type 4)  advertising router... although the type 4 couldn't originate without the asbr, it is the abr that propagates the type 4, both ways...

dr's propagate advertisements... i read that somewhere once...

Sunday, September 2, 2012

distribute-lists...

this topology is great for testing a variety of... things... thank you mr. mcgahan...

i created another loopback on eigrp 1, 7.7.7.7, added the network statement...


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, Loopback1
      6.0.0.0/24 is subnetted, 1 subnets
O E2     6.6.6.0 [110/20] via 10.1.2.2, 00:14:05, FastEthernet1/1
                 [110/20] via 10.1.1.2, 00:13:29, FastEthernet0/0
      7.0.0.0/24 is subnetted, 1 subnets
O E2     7.7.7.0 [110/20] via 10.1.2.2, 00:05:29, FastEthernet1/1
                 [110/20] via 10.1.1.2, 00:05:29, 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, 00:06:28, FastEthernet1/1
O E2     172.16.2.0 [110/20] via 10.1.1.2, 00:06:28, FastEthernet0/0
O IA  192.168.1.0/24 [110/782] via 10.1.1.2, 00:15:27, FastEthernet0/0
O IA  192.168.2.0/24 [110/782] via 10.1.2.2, 00:15:27, FastEthernet1/1

note the 7's, and the table has been restored to e2's only...

r1#ping 7.7.7.7
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 7.7.7.7, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/19/40 ms




let's eliminate the 7's with a distribution list....

access-list 1 permit 6.6.6.0  0.0.0.255

distribute-list 1 out

from r6's eigrp network

of course we have also eliminated the routes to the links to get there with this simple statement because of the implicit deny... ping to 6's still gets there, but that's it...

r6#ping 1.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
r6#ping 1.1.1.1 source 6.6.6.6
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
Packet sent with a source address of 6.6.6.6
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/12/16 ms
r6#ping 1.1.1.1 source 172.16.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
Packet sent with a source address of 172.16.1.1
.....
Success rate is 0 percent (0/5)

and only the 6's show up in r1's table...

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, Loopback1
      6.0.0.0/24 is subnetted, 1 subnets
O E2     6.6.6.0 [110/20] via 10.1.2.2, 00:10:14, FastEthernet1/1
                 [110/20] via 10.1.1.2, 00:10:14, 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
O IA  192.168.1.0/24 [110/782] via 10.1.1.2, 00:35:39, FastEthernet0/0
O IA  192.168.2.0/24 [110/782] via 10.1.2.2, 00:35:39, FastEthernet1/1

it is clear from the table only the 6's are permitted for r1...

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 = 8/11/16 ms
r1#ping 7.7.7.7
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 7.7.7.7, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
r1#ping 172.16.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.1.1, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)

here are some important distinctions from cisco...

distribute-list in (IP)

To filter networks received in updates, use the distribute-list in command in router configuration mode. 

distribute-list out (IP)

To suppress networks from being advertised in updates, use the distribute-list out command in router configuration mode

like in-out on interfaces in acl's, think of in-out from the point of view of origination...

the combinations are limited only by your imagination, and expected behaviors...

Saturday, August 18, 2012

eigrp/ospf redist cont...

configure mutual masturbation between eigrp and ospf...


r2(config)#router ospf 1
r2(config-router)#redistribute eigrp 1 subnets
r2(config-router)#exit
r2(config)#router eigrp 1
r2(config-router)#redistribute ospf 1 metric 10000 100 255 1 1500

r1#sh ip route eigrp

Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 8 subnets, 2 masks
D        172.16.2.0/24 [90/40640000] via 172.16.12.2, 01:38:17, Serial1/0
D EX     172.16.3.0/24 [170/40537600] via 172.16.12.2, 00:00:54, Serial1/0
D        172.16.23.0/24 [90/41024000] via 172.16.12.2, 01:38:17, Serial1/0
D        172.16.100.0/24 [90/40640000] via 172.16.12.2, 01:38:17, Serial1/0
D EX  192.168.8.0/22 [170/40537600] via 172.16.12.2, 00:00:54, Serial1/0
D EX  192.168.20.0/24 [170/40537600] via 172.16.12.2, 00:00:54, Serial1/0
D EX  192.168.25.0/24 [170/40537600] via 172.16.12.2, 00:00:54, Serial1/0
D EX  192.168.30.0/24 [170/40537600] via 172.16.12.2, 00:00:54, Serial1/0
      192.168.35.0/32 is subnetted, 1 subnets
D EX     192.168.35.1 [170/40537600] via 172.16.12.2, 00:00:54, Serial1/0
D EX  192.168.40.0/24 [170/40537600] via 172.16.12.2, 00:00:54, Serial1/0
D     192.168.48.0/23 is a summary, 01:19:56, Null0
r1#

r3#
r3#sh ip route | excl L | inc Loop
     

Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 8 subnets, 2 masks
O E2     172.16.1.0/24 [110/20] via 172.16.23.2, 00:02:49, Serial1/2
O E2     172.16.2.0/24 [110/20] via 172.16.23.2, 00:02:49, Serial1/2
C        172.16.3.0/24 is directly connected, Loopback0
O E2     172.16.12.0/24 [110/20] via 172.16.23.2, 00:02:49, Serial1/2
C        172.16.23.0/24 is directly connected, Serial1/2
O IA     172.16.100.0/24 [110/1563] via 172.16.23.2, 00:11:50, Serial1/2
O     192.168.8.0/22 is a summary, 00:11:50, Null0
      192.168.8.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.8.0/24 is directly connected, Loopback8
      192.168.9.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.9.0/24 is directly connected, Loopback9
      192.168.10.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.10.0/24 is directly connected, Loopback10
      192.168.11.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.11.0/24 is directly connected, Loopback11
      192.168.20.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.20.0/24 is directly connected, Loopback20
      192.168.25.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.25.0/24 is directly connected, Loopback25
      192.168.30.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.30.0/24 is directly connected, Loopback30
      192.168.35.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.35.0/24 is directly connected, Loopback35
      192.168.40.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.40.0/24 is directly connected, Loopback40
O E2  192.168.48.0/23 [110/20] via 172.16.23.2, 00:02:49, Serial1/2
O E2  192.168.50.0/24 [110/20] via 172.16.23.2, 00:02:49, Serial1/2
O E2  192.168.51.0/24 [110/20] via 172.16.23.2, 00:02:49, Serial1/2
O E2  192.168.70.0/24 [110/20] via 172.16.23.2, 00:02:49, Serial1/2

the defaults will work just fine... the numbers are not magical...

r2#sh run | beg eigrp
router eigrp 1
network 172.16.0.0
redistribute ospf 1 metric 1 1 0 1 1500

oh my God... what were those metrics again...

r3#sh ip route | excl L | inc Loop
    
Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 8 subnets, 2 masks
O E2     172.16.1.0/24 [110/20] via 172.16.23.2, 00:11:54, Serial1/2
O E2     172.16.2.0/24 [110/20] via 172.16.23.2, 00:11:54, Serial1/2
C        172.16.3.0/24 is directly connected, Loopback0
O E2     172.16.12.0/24 [110/20] via 172.16.23.2, 00:11:54, Serial1/2
C        172.16.23.0/24 is directly connected, Serial1/2
O IA     172.16.100.0/24 [110/1563] via 172.16.23.2, 00:20:55, Serial1/2
O     192.168.8.0/22 is a summary, 00:20:55, Null0
      192.168.8.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.8.0/24 is directly connected, Loopback8
      192.168.9.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.9.0/24 is directly connected, Loopback9
      192.168.10.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.10.0/24 is directly connected, Loopback10
      192.168.11.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.11.0/24 is directly connected, Loopback11
      192.168.20.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.20.0/24 is directly connected, Loopback20
      192.168.25.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.25.0/24 is directly connected, Loopback25
      192.168.30.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.30.0/24 is directly connected, Loopback30
      192.168.35.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.35.0/24 is directly connected, Loopback35
      192.168.40.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.40.0/24 is directly connected, Loopback40
O E2  192.168.48.0/23 [110/20] via 172.16.23.2, 00:11:54, Serial1/2
O E2  192.168.50.0/24 [110/20] via 172.16.23.2, 00:11:54, Serial1/2
O E2  192.168.51.0/24 [110/20] via 172.16.23.2, 00:11:54, Serial1/2
O E2  192.168.70.0/24 [110/20] via 172.16.23.2, 00:11:54, Serial1/2

r1#sh ip route eigrp

Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 8 subnets, 2 masks
D        172.16.2.0/24 [90/40640000] via 172.16.12.2, 01:49:41, Serial1/0
D EX     172.16.3.0/24 [170/2560512256] via 172.16.12.2, 00:05:55, Serial1/0
D        172.16.23.0/24 [90/41024000] via 172.16.12.2, 01:49:41, Serial1/0
D        172.16.100.0/24 [90/40640000] via 172.16.12.2, 01:49:41, Serial1/0
D EX  192.168.8.0/22 [170/2560512256] via 172.16.12.2, 00:05:55, Serial1/0
D EX  192.168.20.0/24 [170/2560512256] via 172.16.12.2, 00:05:55, Serial1/0
D EX  192.168.25.0/24 [170/2560512256] via 172.16.12.2, 00:05:55, Serial1/0
D EX  192.168.30.0/24 [170/2560512256] via 172.16.12.2, 00:05:55, Serial1/0
      192.168.35.0/32 is subnetted, 1 subnets
D EX     192.168.35.1 [170/2560512256] via 172.16.12.2, 00:05:55, Serial1/0
D EX  192.168.40.0/24 [170/2560512256] via 172.16.12.2, 00:05:55, Serial1/0
D     192.168.48.0/23 is a summary, 01:31:20, Null0

of course your metric output will vary because some settling may occur during shipment...


rip and ospf love cont...

so, you get to a lab that has a million loopbacks, and...
but arteq, perhaps there is more this time...

there are more things in heaven and earth, Horatio, than are dreamt of in your philosophy

ok, this is an awful lot to go through for rip, but ta da...

i give you, prefix-list...

a detailed explanation can be found here, by brian mcgahan,

http://blog.ine.com/2007/12/26/how-do-prefix-lists-work/

he bounces in and out of cln often... he was 20 when he passed his first ccie over ten years ago... damn... another rock star...

anyway, the syntax goes like this:

ip prefix-list (name|number) (deny net/length|permit net/length) (ge length|le length)

an exact match is made if the operators less-than-or-equal-to or greater-than-or-equal-to are left out...

ip prefix-list riptorn permit 192.168.48.0/22
ip prefix-list riptorn deny 192.168.48.0/22 le 24
ip prefix-list riptorn permit 0.0.0.0/0 le 32

the logic makes perfect sense just reading it aloud...

then apply it on the interface out in router config mode...

of course there's a disclaimer that it might not work, so good luck with that... lmao... now RIP all that shit outta there...






rip and ospf love...

rack em up...


bandwidth is 64 and clock rate is 64000 where applicable...

add rip v2 on r1 and r2 and include applicable networks...

remember not to forget no auto-summ... it's v2, right...

r2#sh ip route | excl L | incl Loop
    omitted
Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 7 subnets, 2 masks
R        172.16.1.0/24 [120/1] via 172.16.12.1, 00:00:22, Serial1/0
C        172.16.2.0/24 is directly connected, Loopback0
C        172.16.12.0/24 is directly connected, Serial1/0
C        172.16.23.0/24 is directly connected, Serial1/2
R     192.168.48.0/24 [120/1] via 172.16.12.1, 00:00:22, Serial1/0
R     192.168.49.0/24 [120/1] via 172.16.12.1, 00:00:22, Serial1/0
R     192.168.50.0/24 [120/1] via 172.16.12.1, 00:00:22, Serial1/0
R     192.168.51.0/24 [120/1] via 172.16.12.1, 00:00:22, Serial1/0
R     192.168.70.0/24 [120/1] via 172.16.12.1, 00:00:22, Serial1/0
r2#

r1#sh ip route rip
  omitted
Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 6 subnets, 2 masks
R        172.16.2.0/24 [120/1] via 172.16.12.2, 00:00:03, Serial1/0
R        172.16.23.0/24 [120/1] via 172.16.12.2, 00:00:03, Serial1/0
r1#

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

Routing Protocol is "rip"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Sending updates every 30 seconds, next due in 25 seconds
  Invalid after 180 seconds, hold down 180, flushed after 240
  Redistributing: rip
  Default version control: send version 2, receive version 2
    Interface             Send  Recv  Triggered RIP  Key-chain
    Serial1/0             2     2                                   
    Serial1/2             2     2                                   
    Loopback0             2     2                                   
  Automatic network summarization is not in effect
  Maximum path: 4
  Routing for Networks:
    172.16.0.0
  Routing Information Sources:
    Gateway         Distance      Last Update
    172.16.12.1          120      00:00:05
  Distance: (default is 120)

rip is being advertised out s1/2 because it is being included with the class b...

shut that down by setting the interface to passive...

router rip
passive-int s1/2

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

Routing Protocol is "rip"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Sending updates every 30 seconds, next due in 12 seconds
  Invalid after 180 seconds, hold down 180, flushed after 240
  Redistributing: rip
  Default version control: send version 2, receive version 2
    Interface             Send  Recv  Triggered RIP  Key-chain
    Serial1/0             2     2                                   
    Loopback0             2     2                                   
  Automatic network summarization is not in effect
  Maximum path: 4
  Routing for Networks:
    172.16.0.0
  Passive Interface(s):
    Serial1/2
  Routing Information Sources:
    Gateway         Distance      Last Update
    172.16.12.1          120      00:00:14
  Distance: (default is 120)

rip is still in r1's routing table... a passive interface prevents updates from being sent through rip but it does not affect routes received from it...




go ahead and play with passive interfaces... it's very exciting...

of course, you know what's coming with all those consecutive loopbacks...

r2#sh ip route rip
omitted

Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 7 subnets, 2 masks
R        172.16.1.0/24 [120/1] via 172.16.12.1, 00:00:16, Serial1/0
R     192.168.48.0/24 [120/1] via 172.16.12.1, 00:00:16, Serial1/0
R     192.168.49.0/24 [120/1] via 172.16.12.1, 00:00:16, Serial1/0
R     192.168.50.0/24 [120/1] via 172.16.12.1, 00:00:16, Serial1/0
R     192.168.51.0/24 [120/1] via 172.16.12.1, 00:00:16, Serial1/0
R     192.168.70.0/24 [120/1] via 172.16.12.1, 00:00:16, Serial1/0

the cisco version of ripv2 won't allow you to summarize to a length less than the classful boundary... eeerp...

r1(config)#int s1/0
r1(config-if)#ip summary-address rip 192.168.48.0 255.255.252.0
 Summary mask must be greater or equal to major net

ruh roh...


instead, do this...

r1(config)#int s1/0
r1(config-if)#ip route 192.168.48.0 255.255.252.0 null0
r2#sh ip route | exc L | incl Loop
     omitted
Gateway of last resort is not set

      172.16.0.0/16 is variably subnetted, 7 subnets, 2 masks
R        172.16.1.0/24 [120/1] via 172.16.12.1, 00:00:25, Serial1/0
C        172.16.2.0/24 is directly connected, Loopback0
C        172.16.12.0/24 is directly connected, Serial1/0
C        172.16.23.0/24 is directly connected, Serial1/2
R     192.168.48.0/22 [120/1] via 172.16.12.1, 00:00:25, Serial1/0
R     192.168.48.0/24 [120/1] via 172.16.12.1, 00:00:25, Serial1/0
R     192.168.49.0/24 [120/1] via 172.16.12.1, 00:00:25, Serial1/0
R     192.168.50.0/24 [120/1] via 172.16.12.1, 00:00:25, Serial1/0
R     192.168.51.0/24 [120/1] via 172.16.12.1, 00:00:25, Serial1/0
R     192.168.70.0/24 [120/1] via 172.16.12.1, 00:00:25, Serial1/0

or, just never use rip... even better...

face it, the only time you'll ever need rip is for a lab or exam...