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Which BGP show command for internal prefix count?

Question:
I have two WS-C3560V2-48TS-S routers (R1 and R2); R1 has the full BGP table and some local connections to. They are all being advertise to it's iBGP neighour R2. I can't find a command that I can run on R2 that will show the number of prefixes learnt from R1 that are internal to the local AS only. It just says 425~k which is all the Internet routes and the local ones.
What command can I use for this?
Answer:
the local AS originated networks has AS path attribute empty.
So you could define an ip as-path acl matching an empty string
ip as-path access-list 1 permit ^$
then you can invoke the as-path access-list as a filter action on show ip bgp on R2
show ip bgp filter-list 1
see
BGP command reference
http://www.cisco.com/en/US/docs/ios-xml/ios/iproute_bgp/command/bgp-s1.html#GUID-2618748E-42ED-495A-875C-D398A02D79F9

At this point it is enough to count the lines in show ip bgp filter-list 1 output to count the routes that are originated in the local AS at R1 WS-C3560X-24P-L Price and received on R2 and installed on R2.

Original comes from http://switch.blogcindario.com/


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