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Sunday, October 24, 2010

Question 152

Why is the network 2.2.2.2/32 preferring the next-hop 192.168.1.10 even though the next-hop 192.168.2.22 as-path is shorter?

show ip bgp
BGP table version is 2, local router ID is 1.1.1.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path
*>2.2.2.2/32 192.168.1.10 150 100 0 (65050) 100 i
* 192.168.2.22 50 100 0 100 i
Posted by Packets Analyzed at 1:35 PM
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2 comments:

Anonymous said...

The path through 192.168.1.10 is coming from the same confederation and is not accounted for. So they are considered as if having the same as-path length. And since the local pref is higher for 192.168.1.10 it wins.

October 25, 2010 at 2:00 PM
Packets Analyzed said...

Thats right

This could cause you headaches while troubleshooting if you are not aware of what is happening.

October 25, 2010 at 2:23 PM

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