[j-nsp] RSVP-TE broken between pre and post 16.1 code?

Ryan Gasik rgasik at hunterfiber.com
Fri Jun 28 12:51:28 EDT 2019

I have MXs and ACXs all running RSVP, ranging in versions from 13 to
18. I haven't had any issues.
What platform are you using?

On Fri, Jun 28, 2019 at 7:15 AM <adamv0025 at netconsultings.com> wrote:
> Hi gents,
> Just wondering if anyone experienced RSVP-TE incompatibility issues when
> moving from pre 16.1 code to post 16.1 code.
> Didn't get much out of Juniper folks thus far so I figured I'll ask here as
> well.
> The problem we're facing is that in case 17 code is LSP head-end and 15 code
> is tail-end works, but in the opposite direction 17/15-to-17 (basically
> cases where 17 is the LSP tail-end) the LSP signalling fails.
> Trace reveals that the 17 gets the PATH message for bunch of LSPs, accepts
> it (yes reduction and acks are used), creates the session, then deletes it
> right away for some reason.
> Our testing suggests there are two workarounds for this:
> You might be aware that in 16.1 among other RSVP-TE changes the default
> refresh-time (governing generation of successive refresh messages Path/Resv)
> changed to 1200s -so no what you think making it 1200 on 15 side wont do, it
> has to be less (e.q. 1999s).
> If you want to keep refresh time at 1200 or higher then another option
> strangely enough is to disable CSPF on the affected LSPs (didn't know that
> SPF/CSPF changes contents of the PATH msg that in one case 17 code is cool
> with PATH msg in other case not).
> Would appreciate any pointers.
> adam
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