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Tag posted 09/27/2004
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Strange result, R2 redistribute a route it should not. 
R2 is connected to R3 (RIP). R3 is connected to R4 (RIP). R4 is connected to R5 (OSPF). R4 redistributes routes from OSPF into RIP using tag 4110.

172.16.3.0 is R3 loopback
172.16.1.0 is R5 loopback

In its routing table, R2 has 172.16.1.0 with tag 4110 and 172.16.3.0 withoug tag.

r2#sir 172.16.1.0
Routing entry for 172.16.1.0/24
  Known via "rip", distance 120, metric 3
  Tag 4110
  Redistributing via ospf 1, rip
  Advertised by ospf 1 subnets route-map Tag2120
  Last update from 172.16.23.3 on Serial0, 00:00:21 ago
  Routing Descriptor Blocks:
  * 172.16.23.3, from 172.16.23.3, 00:00:21 ago, via Serial0
      Route metric is 3, traffic share count is 1


r2#sir 172.16.3.0
Routing entry for 172.16.3.0/24
  Known via "rip", distance 120, metric 1
  Redistributing via ospf 1, rip
  Advertised by ospf 1 subnets route-map Tag2120
  Last update from 172.16.23.3 on Serial0, 00:00:07 ago
  Routing Descriptor Blocks:
  * 172.16.23.3, from 172.16.23.3, 00:00:07 ago, via Serial0
      Route metric is 1, traffic share count is 1

R2 is configured to redistribute just routes with tag 4110 (172.16.1.0) but it also redistribute route without tag (172.16.3.0)

router ospf 1
 log-adjacency-changes
 redistribute rip subnets route-map Tag2120
 network 172.16.24.0 0.0.0.255 area 0
 network 172.16.25.0 0.0.0.255 area 0
 network 172.17.25.0 0.0.0.255 area 0
!
route-map Tag2120 permit 5
 match tag 4110

Any comments?