Monday, January 26, 2009

Through the Looking Glass: How to Brush Up on BGP

As someone who himself is looking for employment, I can't stress the importance of keeping your skill set sharp. Of course, unless you are working for a Tier-1 service provider, it may not be possible to keep skills such as BGP as sharp as they need to be for today's job market.

Fortunately, as is usually the case, there is a solution in looking-glass and route servers.

Just do a search for "looking-glass server" and you will come across sites such as, which will provide you with a list of servers to which you can connect.

For example, choosing the route server CerfNet Route Server (AS1838) will open a Terminal session on a Mac (on a PC, however, it will open whatever telnet program you are using). Once you click on the link to open the route server, Terminal (or your telnet program) will open with the following prompt:


From this prompt, you can now begin to look at the BGP configuration of this device:

route-server>sho ip bgp summ
BGP router identifier, local AS number 1838
BGP table version is 1, main routing table version 1

Neighbor        V    AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd    4 17233       0       0        0    0    0 never    Active    4 17233       0       0        0    0    0 never    Active     4 64512 1287988 1287776        1    0    0 11w1d           0     4 64512 1287990 1287784        1    0    0 16w4d           0

You can try different commands, either from the route servers or the looking glass servers and KEEP YOUR BGP SKILLS SHARP!


At 9/03/2009 08:19:00 PM, Anonymous robertmarshall said...

Hey Rob-
I've been on the job hunt as well, trying now to get my CCNA. There are a lot of really good BGP articles at Also check out their sample tests and other free articles to help freshen up your skills.

At 9/03/2009 11:41:00 PM, Blogger rdauman said...

Thanks for the link, Rob. I am actually fortunate to be working again and wish you luck in your job search and with your CCNA.


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