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Redistributing IPv6 Access routes via iBGP?

  • 1.  Redistributing IPv6 Access routes via iBGP?

    Posted 12-04-2020 09:53

    I have an anoying issue where I cannot get subscriber access routes redistributed via iBGP.

    IPv4 access routes redistribute fine and I can redistribute IPv6 routes via OSPF but not iBGP.

    If I check the subscriber it looks fine:

    user@LNS> show subscribers user-name testing@myisp.net
    Interface                                        IP Address/VLAN ID        User Name                                LS:RI
    si-1/0/0.3221358193                         testing@myisp.net               default:default
                                                               * 2a01:123:c060::/48
                                                                * 2a01:123:c05d:7c9::/64

    The route looks good:

    inet6.0: 224 destinations, 269 routes (219 active, 0 holddown, 50 hidden)
    + = Active Route, - = Last Active, * = Both

    2a01:123:c060::/48 *[Access/13] 00:02:58
    Private unicast

    But I can only get it to be advertised out if using OSPFv3. If I check the advertisement for this route to an iBGP neighbour then I thikn I can see the issue but I have no idea what's causing it:

    user@LNS> show route 2a01:123:c060::/48 advertising-protocol bgp extensive

    * 2a01:123:c060::/48 (1 entry, 1 announced)
    BGP group internal type Internal
    BGP label allocation failure: Need an interface
    Nexthop: Not advertised
    Flags: Nexthop Change
    Localpref: 100
    AS path: [12345] I

    So I'm pretty sure it's the BGP label allocation failure with the remark 'need an interface'

    It's dual stack and each circuit is ipv4/ipv6 capable and the ipv4 all advertises fine. the si0/0/0 has both ipv6 and ipv6 families. 

    Not sure where else to start looking? Any advise much appreciated.


  • 2.  RE: Redistributing IPv6 Access routes via iBGP?

    Posted 12-15-2020 03:37
    would you please share the BGP configuration with this bgp neighbor 
    Any label-allocation policy configured?