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On 2/8/19 2:30 PM, Frank Bulk wrote:
> I saw the following Thursday afternoon:
> 
> Feb  7 15:21:54 207.32.15.28 Rib: mpbgp_recv_mpreach: peer 2001:504:27::d1af:0:1 (AS 53679) link-local next hop fe80::e2ac:f1ef:fe4b:d93b%10000 improper, ignoring this next-hop
> Feb  7 15:22:09 207.32.15.28 Rib: mpbgp_recv_mpreach: peer 2001:504:27::d1af:0:2 (AS 53679) link-local next hop fe80::e2ac:f1ef:fe4b:d93b%10000 improper, ignoring this next-hop

That link local address seems to (other than a 2 vs 0) match MAC address
e0ac.f14b.d93b, which is currently in my ARP cache for 206.108.255.119,
which is Paul Bunyan Telephone. I wonder if their router advertised a
link local nexthop to the route servers.

Perhaps the route servers should be filtering the next hop? At a
minimum, it seems like we should limit it to the MICE address space. But
if trivial to implement, it would be best if the nexthop was that of the
peer.

-- 
Richard