vpn6-mpls routes on BIRD 2

[Chris Herdt]

When I run bird in debug mode, I do see a lot of messages about missing
next hop:

bird: peer1: Missing next hop address
bird: peer1: Invalid NEXT_HOP attribute
bird: peer1: Invalid NEXT_HOP attribute
bird: peer1: Invalid NEXT_HOP attribute
[etc.]

When I examine the update packets coming in for IPv6 route announcements,
the next hop is an IPv4 address in this format (addresses changed for
anonymity):

::ffff:192.168.42.6

I have also tried a couple different things in my config files to
explicitly set the next hop address, but the next hop address is still
missing:

filter setnexthop
ip explicit_next_hop;
{
    explicit_next_hop = fd12:3456:789a:1::1;
    bgp_next_hop = explicit_next_hop;
    accept;
}

...

        vpn6 mpls {
                table vpntab6;
                missing lladdr ignore;
                next hop self;
                import filter setnexthop;
        };


Anyone have any advice?

Thanks,

On Thu, Aug 23, 2018 at 8:42 PM Arvin Gan <AGan at advaoptical.com> wrote:

> Hi ,
>
>   From your protocols info, “BGP Next hop:   ::”  in channel vpn6-mpls, if
> next hop is empty, the route is withdrawn. Suggest to check it.
>
>
>
> Best Regards,
>
> Arvin Gan
>
>
>
> *From:* Bird-users <bird-users-bounces at network.cz> *On Behalf Of *Chris
> Herdt
> *Sent:* Friday, August 24, 2018 5:48 AM
> *To:* bird-users at network.cz
> *Subject:* vpn6-mpls routes on BIRD 2
>
>
>
> Thanks to the list for all the help you've given me so far!
>
>
>
> Another question: I am running BIRD 2.0.2 and peering with a host that is
> announcing vpn4 mpls and vpn6 mpls routes.
>
>
>
> The vpn4 mpls routes are working, but all of the vpn6 mpls routes appear
> as withdrawn routes. I'm not sure why -- I looked at the packet capture in
> Wireshark and the UPDATE messages containing the IPv6 routes all show zero
> for Withdrawn Routes Length. Any ideas?
>
>
>
> Here's the result of 'show protocols all peer1' (addresses changed):
>
>
>
> bird> show protocols all peer1
> Name       Proto      Table      State  Since         Info
> peer1      BGP        ---        up     14:35:04.353  Established
>   BGP state:          Established
>     Neighbor address: 192.168.42.1
>     Neighbor AS:      65321
>     Neighbor ID:      192.168.42.1
>     Local capabilities
>       Multiprotocol
>         AF announced: vpn4-mpls vpn6-mpls
>       Route refresh
>       Graceful restart
>       4-octet AS numbers
>       Enhanced refresh
>     Neighbor capabilities
>       Multiprotocol
>         AF announced: vpn4-mpls vpn6-mpls
>       Route refresh
>       Extended next hop
>         IPv6 nexthop: ipv4 ipv4-mc
>       Graceful restart
>         Restart time: 120
>         AF supported: vpn4-mpls vpn6-mpls
>         AF preserved:
>       4-octet AS numbers
>     Session:          internal multihop AS4
>     Source address:   192.168.100.1
>     Hold timer:       12.954/15
>     Keepalive timer:  0.005/5
>   Channel vpn4-mpls
>     State:          UP
>     Table:          vpntab4
>     Preference:     100
>     Input filter:   ACCEPT
>     Output filter:  REJECT
>     Routes:         9771 imported, 0 exported
>     Route change stats:     received   rejected   filtered    ignored
> accepted
>       Import updates:           9771          0          0
> 0       9771
>       Import withdraws:           20          0        ---
> 20          0
>       Export updates:           9771       9771          0
> ---          0
>       Export withdraws:            0        ---        ---
> ---          0
>     BGP Next hop:   192.168.100.1
>     IGP IPv4 table: master4
>   Channel vpn6-mpls
>     State:          UP
>     Table:          vpntab6
>     Preference:     100
>     Input filter:   ACCEPT
>     Output filter:  REJECT
>     Routes:         0 imported, 0 exported
>     Route change stats:     received   rejected   filtered    ignored
> accepted
>       Import updates:              0          0          0
> 0          0
>       Import withdraws:         2785          0        ---
> 2785          0
>       Export updates:              0          0          0
> ---          0
>       Export withdraws:            0        ---        ---
> ---          0
>     BGP Next hop:   ::
>     IGP IPv6 table: master6
>
>
>
>
> --
>
> Chris Herdt
> https://osric.com/chris/
>


-- 
Chris Herdt
https://osric.com/chris/
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