[j-nsp] Cisco-Juniper RSVP aggregate interop

Stacy W. Smith

2008-05-16 20:19:26 UTC

I believe you may be hitting a Cisco bug. Specifically, CSCsj51007.

This is also documented in Juniper PR 232909. The release not for that
PR states:

"In JUNOS 8.x we put all the RSVP submessages inside the RSVP
aggregate bundle including the RSVP PATH messages. This is done only
on the ethernet interface but not on the PT-to-PT links. So each
submessage has TTL value that decrements independently of the TTL
value of the bundle header. When RSVP aggregation (refresh reduction)
is turned ON between a Juniper and Cisco on an ethernet interface,
Cisco compares the IP TTL and the submessage TTL. Instead of comparing
IP TTL and the bundle header TTL. This causes the MPLS LSP to not come
up when LSP is trying to setup between a Juniper and CISCO with a
Juniper router being the ingress and the Cisco as the Egress connected
by a Ethernet interface."

--Stacy

Post by Richard A Steenbergen
I'm trying to set up RSVP on a path that goes Cisco-Juniper-Cisco, but
running into what appears to be some type of interop problem with RSVP
when using aggregate.
Basically the Cisco on either end (this happens on both devices depending
on the direction of the LSP) thinks the Juniper in the middle isn't RSVP
non-RSVP-capable hop between prev-hop and me (ip ttl=254, rsvp
ttl=253)
for new path
The Juniper and Cisco both think that refresh reduction is supported and
Address: x.x.x.x via: blah status: Up
Last changed time: 49:58, Idle: 10 sec, Up cnt: 1, Down cnt: 0
Message received: 694
Hello: sent 331, received: 329, interval: 9 sec
Remote instance: 0xf6ee3e98, Local instance: 0xcb19f014
Refresh reduction: operational
Remote end: enabled, Ack-extension: enabled
And I can even do rsvp Cisco-Juniper w/aggregate just fine, but as soon as
the path goes Cisco-Juniper-Cisco RSVP breaks. If I turn on
interface blah
no-aggregate (reliable doesn't seem to have any effect) the problem goes
away and everything signals correctly.
ip rsvp signalling refresh reduction
ip rsvp signalling hello
ip rsvp signalling hello statistics
ip rsvp policy preempt
interface Tunnel1001
ip unnumbered Loopback0
load-interval 30
tag-switching ip
tunnel destination x.x.x.x
tunnel mode mpls traffic-eng
tunnel mpls traffic-eng affinity 0x0 mask 0x1
tunnel mpls traffic-eng path-option 10 dynamic
tunnel mpls traffic-eng record-route
tunnel mpls traffic-eng fast-reroute
tunnel mpls traffic-eng auto-bw
interface blah
...
mpls traffic-eng tunnels
tag-switching ip
ip rsvp bandwidth 10000000
ip rsvp signalling hello
ip rsvp signalling hello refresh interval 1000
rsvp {
interface blah {
aggregate;
reliable;
subscription 95;
bandwidth 9g;
update-threshold 3;
link-protection;
}
}
Is there something I'm missing here?
--
Richard A Steenbergen <ras at e-gerbil.net> http://www.e-gerbil.net/ras
GPG Key ID: 0xF8B12CBC (7535 7F59 8204 ED1F CC1C 53AF 4C41 5ECA F8B1 2CBC)
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