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?

just type a statement in config mode. i.e

ip route null0
Yup, that will do the trick.
How about changing network (under router bgp 300) mask to
network mask and then adding

aggregate-address summary-only

Would this also be a solution?
Yes, that will result in the desired behavior also.
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