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New Member

BGP Routing Question

Hi Guys I hope someone might have some advice to point me in the right direction. I have a router where if I do a "sh ip bgp 125.112.27.123" displays the following:

BGP routing table entry for 125.112.0.0/12, version 0

Paths: (1 available, no best path)

Not advertised to any peer

9837 7474 2914 4134, (aggregated by 4134 202.97.32.133), (received-only)

203.185.246.117 from 203.185.246.117 (202.92.64.225)

Origin incomplete, localpref 100, valid, external, atomic-aggregate

DMZ-Link Bw 1536 kbytes

However when I type the "sh ip route 125.112.27.123" command I get "% Subnet not in table"

Why is the BGP route not being inserted into the routing table?

7 REPLIES

Re: BGP Routing Question

Hi, as you can see there is "no best path". Only best path routes are added to the routing table. Quite often the next hop is not available. Can you see 203.185.246.117 in your routing table?

New Member

Re: BGP Routing Question

I though so as well but 203.185.246.117 is directly connected.

Hall of Fame Super Bronze

Re: BGP Routing Question

David,

Router with IP address (202.97.32.133) is using the community 'no-export' attribute for this route.

For more information, please read:

http://www.cisco.com/warp/public/459/aggregation.html

___

Please rate helpful posts.

Thanks

New Member

Re: BGP Routing Question

Thanks but how can you tell it is using the 'no-export' attribute?

Hall of Fame Super Bronze

Re: BGP Routing Question

If you read the link that I posted, it describes route aggregation in BGP.

From the output you posted, this section describes why the route is not being forwarded to you.

"(aggregated by 4134 202.97.32.133), (received-only)"

_____

Please rate helpful posts.

Thanks

Re: BGP Routing Question

David,

Can you post the output of 'show ip bgp sum'. It would be even better if you can post the config under the 'router bgp' process.

Sundar

Silver

Re: BGP Routing Question

Try to issue the command show ip bgp

It will show you the route and the associated next hop address.

Try to see if you have route recursion for the next hop otherwise the router won't install the BGP route in ther routing table.

Regards,

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