Re: Bird2 not distributing IPv6 address on dummy to OSPF

28 Sep 2021

      Hello everyone,

I just found that neighbour router Mikrotik has the LSA in table. So I
incorrectly mentioned that Bird2 is not advertising route. But that
route does not appear in Mikrotik routing table. I compared the same
configuration with Quagga (which works correctly) and the difference
between LSAs is LA option bit.

NOT WORKING:
referenced-LS-type=Router LSA
referenced-LS-ID=0
    prefix=2a02:6ca3:0:2::25/128 options=01000000  (LA)

WORKING:
referenced-LS-type=Router LSA
referenced-LS-ID=0
    prefix=2a02:6ca3:0:2::2/128 options=00000000
    prefix=2a02:6ca3:0:2::3/128 options=00000000
    prefix=2a02:6ca3:0:2::4/128 options=00000000

According to RFC5340:

LA-bit
      The "local address" capability bit.  If set, the prefix is
      actually an IPv6 interface address of the Advertising Router.
      Advertisement of local interface addresses is described in
      Section 4.4.3.9.  An implementation MAY also set the LA-bit for
      prefixes advertised with a host PrefixLength (128).

So does it mean that Mikrotik does not understand "MAY implementation"
of LA-bit for host PrefixLength (128)?

ut 28. 9. 2021 o 1:15 Blažej Krajňák <blazej.krajnak@gmail.com> napísal(a):
...
Hello,
I just installed fresh Debian 11 server and I need to distribute IPv6
/128 address from dummy1 interface to OSPF. Direct protocol see that
address, but neighbour not. Am I missing something?
ip -6 route
2a02:6ca3:0:2::25 dev dummy1 proto bird metric 32 pref medium
2a02:6ca3:0:2::25 dev dummy1 proto kernel metric 256 pref medium
bird> show route table master6
Table master6:
2a02:6ca3:0:2::25/128 unicast [ospf2 00:32:34.008] I (150/0) [172.20.12.25]
dev dummy1
log syslog all;
router id 172.20.12.25;
protocol device {
}
protocol direct {
        disabled;               # Disable by default
        ipv4;                   # Connect to default IPv4 table
        ipv6;                   # ... and to default IPv6 table
}
protocol kernel {
        ipv4 {
              export all;
        };
}
protocol kernel {
        ipv6 {
               export all;
        };
}
protocol static {
        ipv4;
}
protocol static {
        ipv6;
}
protocol ospf v2 {
        ipv4 {
                import all;
        };
        area 0 {
                interface "ens192" {
                        type broadcast;
                };
                interface "dummy1" {
                        stub;
                };
        };
}
protocol ospf v3 {
        ipv6 {
                import all;
        };
        area 0 {
                interface "ens192" {
                        type broadcast;
                };
                interface "dummy1" {
                        stub;
                };
        };
}