As a lab, I am trying to run BGP between a 2811 (running advipsvcs 12.4(15)T1) and a 3560 in L3 switching mode (running ipsvcs 12.2(25)SEE3). The two devices become BGP peers, but never seem to exchange any routes! The configuration is simple -- two different AS with several network statements each (the router has loopback addresses, the switch 2 ports configuring as no swi and with IP addresses). Here are the configs:
router bgp 6002
neighbor 188.8.131.52 remote-as 6502
router bgp 6502
neighbor 184.108.40.206 remote-as 6002
I can't see how it could be simpler than that, but neither device sees any bgp routes. show ip bgp shows the session established and keep-alives being processed...but no route refreshes at all.
BGP works differently when you have no auto-summary in the config. If you leave this out then bgp starts to be classful and any routes in a class that match will allow the class to be advertised not just the specific.
If you put no auto-summary in the config then bgp expects to see the exact route in the routing table before it will announce them.
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