* Iljitsch van Beijnum
> IPv6 BGP does in fact carry gloal and link local next hop addresses.
Yes, but my point is that if you don't configure a global (at least
non-link-local) prefix on the router interconnections, there's no global
address that can be announced as the BGP next-hop. With no global
address, the immediate link-local next-hop cannot be resolved in the
IGP, and the route is discarded. Or am I missing something?
For example, here's my BGP route to your e-mail domain. The key item
here is «Protocol next hop: 2a02:228:81:100::», which is the remote
router in the link-net to AS3292. If this link was numbered with
link-local addresses only, I don't see how this route could possibly be
used, unless you start mangling the BGP next-hop?
tore@cr2> show route 2001:1af8:2:5::2 active-path extensive
inet6.0: 4377 destinations, 8940 routes (4376 active, 0 holddown, 1 hidden)
2001:1af8::/32 (3 entries, 1 announced)
TSI:
KRT in-kernel 2001:1af8::/32 -> {indirect(1048574)}
*BGP Preference: 170/-51
Next hop type: Indirect
Next-hop reference count: 5286
Source: 2a02:c0:1000::2
Next hop type: Router, Next hop index: 614
Next hop: fe80::221:59ff:fe0e:9295 via xe-1/0/0.0, selected
Protocol next hop: 2a02:228:81:100::
Indirect next hop: 11355ac8 1048574
State: <Active Int Ext>
Local AS: 39029 Peer AS: 39029
Age: 3:58:10 Metric: 20 Metric2: 2 MED-plus-IGP:
22
Task: BGP_39029.2a02:c0:1000::2+179
Announcement bits (2): 0-KRT 6-Resolve tree 4
AS path: 3292 16265 I
AS path: Recorded
Communities: 3292:1110 3292:24601
Accepted
Localpref: 50
Router ID: 87.238.32.5
Indirect next hops: 1
Protocol next hop: 2a02:228:81:100:: Metric: 2
Indirect next hop: 11355ac8 1048574
Indirect path forwarding next hops: 1
Next hop type: Router
Next hop: fe80::221:59ff:fe0e:9295 via
xe-1/0/0.0
2a02:228:81:100::/127 Originating RIB: inet6.0
Metric: 2 Node path count: 1
Forwarding nexthops: 1
Nexthop: fe80::221:59ff:fe0e:9295 via xe-1/0/0.0
--
Tore Anderson
Redpill Linpro AS - http://www.redpill-linpro.com/
Tel: +47 21 54 41 27
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