Hello Elmar: > -----Original Message----- > From: [email protected] [mailto:cisco-nsp- > [email protected]] On Behalf Of Elmar K. Bins > Sent: Thursday, March 04, 2010 5:57 AM > To: [email protected] > Subject: [c-nsp] IPv6, neighbor detection, BGP and my nerves... > > Hello everybody, > > here's the setup: > > Router model is 7301+PA-2FE-TX with IOS 12.3(14)T3. For those > who shout "upgrade!" already - same problem with 12.4s. > > Router is connected to HKIX via FastEthernet1/1. > > No problems whatsoever in IPv4, but here's what I have in IPv6: > > 1. IPv6 BGP saves routes with a prefix source of <official > IPv6 address>, but stores the next hop out of FE80::/8. > > [ipv6 bgp] > BGP routing table entry for 2001:4F8::/32, version 42465 > ... > 6939 1280 > 2001:7FA:0:1::CA28:A19E (FE80::212:F2FF:FE9C:2150) from > 2001:7FA:0:1::CA28:A19E (216.218.252.180) > Origin IGP, localpref 100, valid, external, best > > [ipv6 route] > B 2001:4F8::/32 [20/0] > via FE80::212:F2FF:FE9C:2150, FastEthernet1/1 > > > 2. The trouble is that the router does not "see" some of the > FE80::/8 addresses most of the time, meaning that IPv6 nd > does not resolve (router gets no answer) and leaves "INCMP" > entries in the neighbor table. > > At other times (quite rarely), the FE80:: address is reachable > and IPv6 ND resolves. > > The official IP address of the partner is always "visible". > > [ipv6 nei] > > 2001:7FA:0:1::CA28:A19E 0 0012.f29c.2150 REACH > Fa1/1 > FE80::212:F2FF:FE9C:2150 0 - INCMP > Fa1/1 > > > Clearing the ipv6 neighbor table does not help... > > Can anyone help me with these following questions: > > Towards 1. above - can I keep the FE80 addresses out of the equation > entirely and have BGP save the neighbor address as the next hop? > > Towards 2. above - has anyone seen same behaviour and/or have a > - workaround > - lead to a bug id? > > > Any help is much appreciated... > You might want to modify your interface configuration to match the one below. You shouldn't need neighbor discovery and the like for a direct peering connection. This is the configuration I use at the SIX.
interface GigabitEthernet0/0 description SIX IP Uplink ipv6 address <v6 address>/64 no ipv6 redirects ipv6 nd suppress-ra no ipv6 mld router no ipv6 pim Regards, Mike _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
