Henning Brauer wrote:
* Graeme Lee <[EMAIL PROTECTED]> [2008-08-21 01:51]:
I've had to connect to a new upstream peer which is advertising an IPv4
safi of 128 (MPLS-labelled VPN address)
see http://www.iana.org/assignments/safi-namespace
I've modified the source to temporarily ignore this (actually anything over
127) as it currently only accepts 1 thru 3. Once the session is
established, everything works well. What I really need to know is if this
is potentially A Huge Mistake, or should bgpd be able to ignore unsupported
capabilities being advertised to it?
the standards are pretty unclear about it, but the most logical
interpretation is that we have to send back a notification telling the
peer that we don't support this so capability negotiation actually works.
what is the peer? first time i hear sth doens't work w/ capa negitiation...
The peer is NexGen networks. I gather they're using an Alcatel OS/R.
All I've done to work around this at present is extended the test in
session.c to ignore mp_safi < 128 after the first test fails.
Otherwise I just get this in the log every 30 seconds:
Aug 19 11:01:30 gw-nexgen bgpd[22795]: neighbor 121.200.227.93 (NexGen):
state change Idle -> Active, reason: Start
Aug 19 11:01:30 gw-nexgen bgpd[22795]: neighbor 121.200.227.93 (NexGen):
state change Active -> OpenSent, reason: Connection opened
Aug 19 11:01:30 gw-nexgen bgpd[22795]: neighbor 121.200.227.93 (NexGen):
parse_capabilities: AFI IPv4, mp_safi 128 illegal
Aug 19 11:01:30 gw-nexgen bgpd[22795]: neighbor 121.200.227.93 (NexGen):
state change OpenSent -> Idle, reason: OPEN message received
Changing the test allows bgpd to continue, and I can get the following
at least:
# bgpctl show neigh
BGP neighbor is x, remote AS 38809
Description: NexGen
BGP version 4, remote router-id
BGP state = Established, up for 1d01h50m
Last read 00:00:04, holdtime 90s, keepalive interval 30s
Neighbor capabilities:
Multiprotocol extensions: IPv4 unknown (128)
Route Refresh
Message statistics:
Sent Received
Opens 1 1
Notifications 0 0
Updates 4 92476
Keepalives 2522 3107
Route Refresh 0 0
Total 2527 95584
Update statistics:
Sent Received
Updates 4 351083
Withdraws 3 17886
Local host: 121.200.227.94, Local port: 41277
Remote host: 121.200.227.93, Remote port: 179
