I was trying to turn up our BGP session with a new provider as part of our transition to a whole nw infrastructure but after BGP session was Established, I reliased that no Prefixes have been advertised to our Peer or upstream provider!
here is my configuration, pls see if you can find any problems and advise acordingly:
router bgp xxxx
network 216.x.192.0 mask 255.255.240.0
network 216.x.224.0 mask 255.255.224.0
network 216.x.224.0 mask 255.255.240.0
neighbor 216.x.125.241 remote-as xxxx
neighbor 216.x.125.241 prefix-list default in
neighbor 216.x.125.241 prefix-list secondblock out
no ip http server
ip prefix-list default seq 5 permit 0.0.0.0/0
ip prefix-list secondblock seq 10 permit 216.x.192.0/20
ip prefix-list secondblock seq 15 permit 216.x.224.0/19
I use EIGRP for iGP and when we stoped our current BGP session with the old provider to start using the new provider, I startwed seeingall those 216.x.x.x blocks (above in the network statemnet) coming to this border router as /24s.
that being said, BGP should know that it should advertise them in /20 and /19 but
i couldn't see any route or prefixes being advertised to our new provider, we though received the default routes from them but nothing out to them!!?
i tried to clear bgp soft in a soft out but made no difference.
Should the "NULL0" statemnet be also in the router configuration for BGP advertisement to work?