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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This blog will continue to include questions, troubleshooting scenarios, and references to existing and new technologies but will grow to include a variety of different platforms and technologies. Currently I have created over 185 questions/answers in regards to the CCIE R&S track!! Note: answers are in the comment field or within "Read More" section.

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Monday, October 18, 2010

Question 144

What is the maximum number of network statements allowed in BGP?

3 comments:

Packets Analyzed said...

Maximum "network x.x.x.x mask x.x.x.x" statement in BGP is 200. If you have more than 200 networks to advertise you will have to leverage redistribution.

networkdongle said...

i took a look at this one to see if i could find it and this is what i found in the doccd:

Command History
Release Modification
12.0 The limit of 200 network commands per BGP router was removed.

http://www.cisco.com/en/US/customer/docs/ios/ipv6/command/reference/ipv6_10.html#wp2460941

so at that point it doesnt say there is a limit so it would be a matter of memory of the router for bgp and/or total that you could having running and process and then a limit on the actual size of the running-config could limit you also sure you would run out of memory for each route along that point

Packets Analyzed said...

Well, I read the area of the document that you were referring and I was a little sceptical because the document was referencing IPV6. I decided to lab it up and confirm whether or not there is a limit of 200 networks statements.

Drum roll please..........I was able to get more the 200 network statements so my initial answer to the question only applies to IOS's previous to version 12.0. BTW - I tried to add the configuration but the blog limits comments to 4096 characters.

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