January 2002
Beginner
238 pages
6h 20m
English
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Fine-Tuning RIP
We saw in the section on RIP metrics that the preferred path between NewYork and Ames would be the two-hop path via Chicago rather than the one-hop 56-kbps path that RIP selects. The RIP metrics can be manipulated to disfavor the one-hop path through the use of offset lists:
hostname NewYork ... router rip network 172.16.0.0 offset-list 10 in 2 serial1 ... access-list 10 permit 172.16.100.0 0.0.0.0 hostname Chicago ... router rip network 172.16.0.0 Ames#config terminal router rip network 172.16.0.0 offset-list 20 in 2 serial1 ... access-list 20 permit 172.16.1.0 0.0.0.0
NewYork adds 2 to the metric for the routes specified in access list 10 when learned via serial1, and Ames adds 2 to the metric for the routes specified in access list 20 when learned via serial1. The direct route over the 56-kbps link thus has a metric of 3, and the route via Chicago has a metric of 2. The new routing tables look like this:
NewYork>sh ip route
...
Gateway of last resort is not set
C 192.168.1.0 is directly connected, Ethernet1
172.16.0.0/16 is subnetted, 6 subnets
C 172.16.1.0 is directly connected, Ethernet0
C 172.16.250.0 is directly connected, Serial0
C 172.16.251.0 is directly connected, Serial1
R 172.16.50.0 [120/1] via 172.16.250.2, 0:00:11, Serial0
R 172.16.100.0 [120/2] via 172.16.250.2, 0:00:19, Serial0 R 172.16.252.0 [120/1] via 172.16.250.2, 0:00:11, Serial0 [120/1] via 172.16.251.2, 0:00:19, Serial1 Ames>sh ip route ... Gateway of last resort is not set 172.16.0.0/16 is ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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