Goal:
Check out the URL at the bottom of this article, open it and scroll to the bottom.
Find one of the public route servers and telnet into it.
Use 'show ip bgp' just to take a look at some information in the routing table.
See if you can create the following regular expressions to solve some questions,
in this example I'm using AS 3491 but another AS you see with the 'show ip bgp'
command is fine.
Use the 'show ip bgp regexp' command to enter the regular expressions.
Create a regular expression that only shows AS 3491.
^3491$
Create a regular expression that shows AS 3491 at the beginning, and everything
behind it. For example:
3491 5423 5431 5434
^3491_
Create a regular expression that shows all networks that originate in AS 3491
_3491$
Create a regular expression that only shows the locally originated networks.
^$
Create a regular expression that shows everything where AS 3491 is in the
middle of the AS-PATH.
_3491_
Create a regular expression that shows all networks that are originated by your
directly connected AS neighbors.
^[0-9]+$