On Thursday 15 November 2007 17:40:54 Adam Greene wrote: > Lots of o's in that subject line ... > > I'm trying to set up a BGP session over a PPPoEoA DSL line. This is in the > context of setting up redundant DSL lines to a single provider router. I > control both ends (PE and CE). PE is 7200 NPE 200, IOS 12.3(15b). CE is > 1841, IOS 12.4(17). > > I can't establish the BGP session. Both sides are in active state, but > won't go further. > > The PE ATM interface is configured as IP unnumbered pointing to Loopback 0. > The CE BGP neighbor thus points to the PE Loopback IP address. The PE BGP > neighbor points to the IP address assigned to the CE Dialer (a /32 from the > /23 block on the PE Loopback). > > I saw that the CE was reporting that the external BGP neighbor is not > directly connected, so I issued "neighbor A.B.C.D disable-connected-check" > to no avail. > > I tried specifying the update-source interface on both ends (loopback 0 on > PE, Dialer1 on CE) again to no avail. > > I'm wondering if I have to do something at the neighbor A.B.C.D transport > level, like disabling path-mtu-discovery (this is a wild shot in the dark). > > Has anyone else successfully established BGP over PPPoEoA before?
Yes, and it (still) works. As Aaron and Peter already mentioned you should use "ebgp-multihop" on both systems. Our config looks like this: CE config: ========== ! interface Dialer1 ! local IP address is always 10.250.250.50/32 and ! remote-GW IP address 10.255.255.255 - from PPP/RADIUS ip address negotiated encapsulation ppp ... ! ! router bgp 65534 neighbor 10.255.255.255 remote-as 123 neighbor 10.255.255.255 ebgp-multihop 2 ... ! PE config: ========== ! interface Loopback101 ip address 10.255.255.255 255.255.255.255 ! ! router bgp 123 ... neighbor 10.250.250.50 remote-as 65534 neighbor 10.250.250.50 ebgp-multihop 2 neighbor 10.250.250.50 update-source Loopback101 ... ! -- Gerald (ax/tc) _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
