From: Ccie candidate (beacc1e@yahoo.com)
Date: Tue Dec 31 2002 - 13:22:06 GMT-3
Kym,
I have tried the 2nd option you have suggested
I have the following setup.
R4(to)------(t0/0)R6(s0/0-FR) ------(s5/1-FR) R2
R4 and R6 is running OSPF
R6 and R2 is running RIP v1.
Interface information:
R6 s0/0 ---> 148.9.100.1/24
R6 t0/0 ---> 148.9.1.2/30
R4 t0 ---> 148.9.1.1/30
R2 s5/1---> 148.9.100.2/24
The following are the configs for each router.
R6
router ospf 54
log-adjacency-changes
summary-address 130.0.0.0 255.0.0.0
redistribute rip metric 10 subnets
network 148.9.1.2 0.0.0.0 area 0
router rip
redistribute ospf 54 metric 2
network 148.9.0.0
R2
router rip
network 148.9.0.0
R4
r4-ccie#sh run | be router ospf
router ospf 54
log-adjacency-changes
network 148.9.1.0 0.0.0.3 area 0
network 148.9.1.8 0.0.0.3 area 0
network 148.9.4.0 0.0.0.255 area 0
network 160.1.1.0 0.0.0.255 area 0
R6#sh ip route ospf
160.1.0.0/32 is subnetted, 1 subnets
O 160.1.1.1 [110/7] via 148.9.1.1, 00:06:14, TokenRing0/0
148.9.0.0/16 is variably subnetted, 7 subnets, 2 masks
O 148.9.1.8/30 [110/7] via 148.9.1.1, 00:06:14, TokenRing0/0
O 148.9.4.0/24 [110/7] via 148.9.1.1, 00:06:14, TokenRing0/0
O 130.0.0.0/8 is a summary, 01:03:53, Null0
R6#
R2 learns rip updates from R6 matching subnet /24, others (such as 160.1.1.0) only major network address itself is included in the advertisement.
R2#sh ip route rip
R 160.1.0.0/16 [120/2] via 148.9.100.1, 00:00:11, Serial5/1
148.9.0.0/24 is subnetted, 5 subnets
R 148.9.4.0 [120/2] via 148.9.100.1, 00:00:11, Serial5/1
R 148.9.6.0 [120/1] via 148.9.100.1, 00:00:11, Serial5/1
R2#
Now to learn other networks with different subnets (such as 148.9.1.0/30 and 148.9.1.8/30) I have added the secondary address to the R2(s5/1) and R6 (s0/0)
R6 (s0/0)
interface Serial0/0
ip address 148.9.1.65 255.255.255.252 secondary
ip address 148.9.100.1 255.255.255.0
R2 (s5/1)
interface Serial5/1
description to (FR s1/6)
ip address 148.9.1.66 255.255.255.252 secondary
ip address 148.9.100.2 255.255.255.0
This is (bolded entries) what happens.
**148.9.1.0/30 and 148.9.1.8/30) did not show up in the rip routing table.
R2#sh ip route rip
R 160.1.0.0/16 [120/2] via 148.9.100.1, 00:00:15, Serial5/1
148.9.0.0/16 is variably subnetted, 8 subnets, 2 masks
R 148.9.4.0/30 [120/2] via 148.9.100.1, 00:00:15, Serial5/1
R 148.9.4.0/24 [120/2] via 148.9.100.1, 00:01:10, Serial5/1
R 148.9.6.0/30 [120/1] via 148.9.100.1, 00:00:15, Serial5/1
R 148.9.6.0/24 [120/1] via 148.9.100.1, 00:01:10, Serial5/1
R2#
Using "ip summary-address rip 148.9.1.0 255.255.255.0" on the R6(s0/0) adds 148.9.1.0/30 but not the 148.9.1.8/30. Actually summary is not allowed.
Any idea ?
Thanks
Kafkaf
-----Original Message-----
From: kym blair [mailto:kymblair@hotmail.com]
Sent: Sunday, December 29, 2002 4:05 AM
Subject: Re: RIP to OSPF redistribution
Jay and Yong,
When you are doing mutual redistribution between OSPF and RIP, there are
several ways to get the OSPF routes into RIP:
(1) Use RIP version 2
(2) Create a /30 secondary address on the R2-R3 link so R3 will learn the
/24 AND /30 routes (repeat for other masks)
(3) Create a tunnel between R2 and R3 with a /30 mask (repeat for other
masks)
(4) My favorite if you can't use RIPv2: Create another OSPF process on R2;
redistribute OSPF 1 into OSPF 2; add summary-address statements under OSPF
2; redistribute OSPF 1 and OSPF 2 into RIP.
HTH, Kym
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This archive was generated by hypermail 2.1.4 : Fri Jan 17 2003 - 17:21:55 GMT-3