This blog was originally started to better help me understand the technologies in the CCIE R&S blueprint; after completing the R&S track I have decided to transition the blog into a technology blog.

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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

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.

Packets Analyzed said...

Thats right

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

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