I saw this interesting issue about the metrics of summarized routes after being redistributed into RIP.
Scenario:
R1—RIP—R2—OSPF—R5—5.5.5.5/32
R2 is redistributing OSPF to RIP as follows:
R2#sho run | sec router rip
router rip
version 2
redistribute ospf 1 metric 2
network 192.168.0.0
no auto-summary
R1 has the following route:
R1#sho ip route | sec 5.0.0.0
5.0.0.0/32 is subnetted, 1 subnets
R 5.5.5.5 [120/2] via 192.168.0.2, 00:00:11, FastEthernet0/0
1-Manual Summary:
R2(config)#int f0/0
R2(config-if)#ip summary-address rip 5.0.0.0 255.0.0.0
R1#sho ip route | sec 5.0.0.0
R 5.0.0.0/8 [120/3] via 192.168.0.2, 00:00:01, FastEthernet0/0
The metric increased by 1.
2-Auto-summary:
R2(config-if)#router rip
R2(config-router)#auto-summary
R1#sho ip route | sec 5.0.0.0
R 5.0.0.0/8 [120/2] via 192.168.0.2, 00:00:05, FastEthernet0/0
The metric is the same as when redistributed.
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