[j-nsp] RSVP LSP inconsistency

[David Ball]

     I have 2 T640s running 8.1R5 connected via 10GigE.  OSPF and BGP
are up and exchanging routes.  I have LDP configured and is building
LSPs as expected, and traffic is passing.  I've also configured RSVP
on both routers, and it...almost...works.

    The issue I'm seeing is that according to 1 of the T640s, both
ingress and egress RSVP-signalled LSPs are 'Up'.  However, according
to the other router, only 1 of them is up.  I can't think of how it
may be possible that 2 routers think differently about the current
state of the same LSP.  Was hoping someone here might have an idea.
I've already opened a TAC case, but I have yet to hear anything.
Thought I might try you good folks concurrently. Thanks in advance for
any guidance.

First, a 'show rsvp session from ROUTER1:

dball at ROUTER1-re0> show rsvp session
Ingress RSVP: 1 sessions
To              From            State   Rt Style Labelin Labelout LSPname
1.7.1.22        1.7.1.1         Up       0  1 FF       -        3
NCP-LSP-00813-001-022
Total 1 displayed, Up 1, Down 0

Egress RSVP: 1 sessions
To              From            State   Rt Style Labelin Labelout LSPname
1.7.1.1         1.7.1.22        Up       0  1 FF       3        -
NCP-LSP-00820-022-001
Total 1 displayed, Up 1, Down 0

Transit RSVP: 0 sessions
Total 0 displayed, Up 0, Down 0

dball at ROUTER1-re0>


And now, a 'show rsvp session' from ROUTER2, showing the same 2 LSPs,
but in different states:
dball at ROUTER2-re0> show rsvp session
Ingress RSVP: 1 sessions
To              From            State   Rt Style Labelin Labelout LSPname
1.7.1.1         1.7.1.22        Dn       0  0  -       -        -
NCP-LSP-00820-022-001
Total 1 displayed, Up 0, Down 1

Egress RSVP: 1 sessions
To              From            State   Rt Style Labelin Labelout LSPname
1.7.1.22        1.7.1.1         Up       0  1 FF       3        -
NCP-LSP-00813-001-022
Total 1 displayed, Up 1, Down 0

Transit RSVP: 0 sessions
Total 0 displayed, Up 0, Down 0

dball at ROUTER2-re0>


A bit more info from ROUTER2 (the router that sees 1of the LSPs as 'Dn':

dball at ROUTER2>show mpls lsp extensive
<snip>
1.7.1.1
  From: 1.7.1.22, State: Dn, ActiveRoute: 0, LSPname: NCP-LSP-00820-022-001
  Description: NCP-LSP-00820-022-001
  ActivePath: (none)
  FastReroute desired
  LoadBalance: Random
  Encoding type: Packet, Switching type: Packet, GPID: IPv4
  Primary                    State: Dn
    OptimizeTimer: 30
    SmartOptimizeTimer: 180
    Reoptimization in 12 second(s).
    Computed ERO (S [L] denotes strict [loose] hops): (CSPF metric: 1)
 1.7.2.21 S
   9283 Jan 19 15:36:30.800 Originate Call
   9282 Jan 19 15:36:30.800 Clear Call
   9281 Jan 19 15:36:30.800 CSPF: computation result accepted  1.7.2.21
   9280 Jan 19 15:36:01.368 Originate Call
   9279 Jan 19 15:36:01.368 Clear Call
   9278 Jan 19 15:36:01.368 CSPF: computation result accepted  1.7.2.21
   9277 Jan 19 15:35:32.356 Originate Call
   9276 Jan 19 15:35:32.356 Clear Call
<snip>


And finally, the log entries. I can't find decently descriptive info
on what the 'RSVP error' lines mean.  Found what 'code 4' means, but
not much in the way of what I should/could do to fix it.

dball at ROUTER2>show log rsvp   (traceoptions are set to 'packets' and 'error')
Jan 19 15:35:05.474619 RSVP send Path 1.7.1.22->1.7.1.1 Len=248 ge-0/0/0.0
Jan 19 15:35:05.585878 RSVP recv Ack 1.7.2.1->1.7.2.22 Len=20 ge-0/0/0.0
Jan 19 15:35:06.056029 RSVP recv SummaryRefresh 1.7.2.1->1.7.2.22
Len=24 ge-0/0/0.0
Jan 19 15:35:06.056114 RSVP send Ack 1.7.2.22->1.7.2.1 Len=20 ge-0/0/0.0
Jan 19 15:35:06.056176 RSVP recv Path 1.7.2.1->1.7.2.22 Len=248 ge-0/0/0.0
Jan 19 15:35:06.056189 RSVP send Ack 1.7.2.22->1.7.2.1 Len=20 ge-0/0/0.0
Jan 19 15:35:06.185954 RSVP recv Resv 1.7.2.1->1.7.2.22 Len=132 ge-0/0/0.0
Jan 19 15:35:06.185999 RSVP send Ack 1.7.2.22->1.7.2.1 Len=20 ge-0/0/0.0
Jan 19 15:35:06.186053 RSVP error, recv resv no path info Resv
1.7.2.1->1.7.2.22 Len=132
Jan 19 15:35:06.186067 RSVP error, originate ResvErr ResvErr
1.7.2.22->1.7.2.1 Len=8  code 4 subcode 0
Jan 19 15:35:06.186075 RSVP send ResvErr 1.7.2.22->1.7.2.1 Len=104 ge-0/0/0.0

David