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How to reduce BGP scanner in C7200?

Hi,

I have a Cisco 7206VXR with NPE-300 and 256 MB of RAM.

I have the problem issue that the BGP scanner process is about 9.6% on 32% of total CPU load.Randomly there are picks up to 99% of BGP scanner.

I thought that it caused by route flapping but after enabling bgp dampening it happened anything.

Does anyone know how to create route inbound filtering from two peers?

Thank you very much.

Regrds.

Paolo

2 REPLIES

Re: How to reduce BGP scanner in C7200?

I dont know much about how to implement a solution for this problem,

but check this link, might help:

Troubleshooting High CPU Caused by the BGP Scanner or BGP Router Process

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00801c4f48.shtml

HTH,

Vlad

Bronze

Re: How to reduce BGP scanner in C7200?

The BGP scanner by default runs every 60seconds. It goes through and updates the BGP tables (remove or add routes based on current information).

For filtering on the inbound direction, you can filter based on prefix or ASN. The following example is a bit of an overkill, but it only allows the /23 prefix listed, routes in this /23 originated in the AS listed, and a max of 50 routes to be advertised to this device:

neighbor 1.1.1.1 remote-as 65001

neighbor 1.1.1.1 description [Customer-A]

neighbor 1.1.1.1 prefix-list Customer in

neighbor 1.1.1.1 maximum-prefix 50

neighbor 1.1.1.1 filter-list 32 in

ip prefix-list Customer-In description [Customer-A]

ip prefix-list Customer-In seq 5 permit 10.0.0.0/23

ip as-path access-list 32 permit _65001$

You could always talk to your ISP and take partial routes instead of a full table if you wanted. Hope this helps.

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