Monday, February 20, 2006


BGP prefix advertisement problem. (Question #19)

Consider the following router configured to run BGP. Here is some relevant configuration from the router

interface Ethernet0/0
ip address
no keepalive
router bgp 300
no synchronization
bgp log-neighbor-changes
network mask
neighbor remote-as 100
neighbor remote-as 200
no auto-summary

and "show ip route" from the router shows the following

Gateway of last resort is not set is subnetted, 3 subnets
C is directly connected, Ethernet0/0
C is directly connected, Serial3/0
C is directly connected, Serial2/0

It is seen that this router's BGP neighbors are not learning the route to in spite of the fact that this router is advertising that prefix. What is the problem here? How can it be fixed?


Summarizing routes with EIGRP and RIP. (Question #18)

Assume two routers connected to each other over ethernet. Router1 is advertising the following prefixes
to Router2. Assuming that the routers are running EIGRP (AS 100), specify the command to cause the manual summarization of these prefix advertisements to instead. Will the command for summarization have to be applied globally or to an interface?

Next assume that the routers are running RIPv2 instead of EIGRP. Specify the command to be used for RIPv2 to achieve the same goal.

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