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verifing Internet routes on BGP router

Is there a way to verify that my BGP(internet) internet connected router is getting all the internet routes it should be getting?

6 REPLIES

Re: verifing Internet routes on BGP router

You should be able to run:

sh ip bgp neig

sh ip route bgp

Others know more about BGP than I do, but these are the basic commands to see if you have a neighbor configured, and then to see if you're BGP routes are showing up in your routing table. They'll be marked with a "B."

--John

HTH, John *** Please rate all useful posts ***
New Member

Re: verifing Internet routes on BGP router

thank you but I was probably to vague in my qiestion. I understand how to see BGP neighbors and view BGP routes in the routing table I was more concerned with being able to verify that I was getting all the routes from my ISP. Now that I look at it more closely I am not sure there is any way other than seeing the total route counts and if it is in 100K+ range assume I am getting all internet routes.

thanks

New Member

Re: verifing Internet routes on BGP router

In fact, it's more in the 250K+ range than in the 100K. If you only have ~100K routes, you are missing more than half the internet.

I think your provider is feeding your router with "customer routes", i.e., its own routes plus their clients'.

Re: verifing Internet routes on BGP router

Hello,

You can use the "sh ip bgp sum" command to view quickly an approximate total number of routes received from your ISP.

Sample output:

...

Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd

4 1618700 129642 11697332 0 0 2w6d 265990

...

The value under the "State/PfxRcd" column shows how many prefixes you have received over an established session with your peer (~265990 now).

Check out the website: http://bgp.potaroo.net/ for current status of the Internet Routing Table.

Kind Regards,

M.

Hall of Fame Super Silver

Re: verifing Internet routes on BGP router

Hello Mari,

good answer and good link too

Best Regards

Giuseppe

New Member

Re: verifing Internet routes on BGP router

great link, thanks for the information.

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