RIP metric when summarizing redistributed routes

By | December 29, 2021

I saw this interesting issue about the metrics of summarized routes after being redistributed into RIP.



R2 is redistributing OSPF to RIP as follows:

R2#sho run | sec router rip
router rip
 version 2
 redistribute ospf 1 metric 2
 no auto-summary

R1 has the following route:

R1#sho ip route | sec is subnetted, 1 subnets
R [120/2] via, 00:00:11, FastEthernet0/0

1-Manual Summary:

R2(config)#int f0/0
R2(config-if)#ip summary-address rip 

R1#sho ip route | sec
R [120/3] via, 00:00:01, FastEthernet0/0

The metric increased by 1.


R2(config-if)#router rip

R1#sho ip route | sec
R [120/2] via, 00:00:05, FastEthernet0/0

The metric is the same as when redistributed.

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