[j-nsp] Strange MPLS behaviour

[Elmar Kirchner]

Jonas,

please send more info on what is going wrong (show route, show mpls lsp etc.).

 From your description it is not clear to me if you refer to packets of the signalling plan (rsvp etc.) or the forwarding plane (locally sourced ping etc.) or both.

/elmar



At 09:06 AM 12/21/2004, Jonas Frey wrote:
>Hi,
>
>it seems i have located the problem.
>When the LSP gets up, all local sourced (by one of the routers)
>connections are using the IP address of the fxp0 interface (which in our
>case are private, non-routed IPs). 
>Thus packets get dropped once they try to enter the other router.
>
>How can i tell JunOS to *not* use fxp0 for outgoing connections via
>MPLS?
>Since i have from/to statements in the lsp config, junos should use
>these IPs to send all traffic. 
>I have no idea how/why JunOS thinks it can use fxp0 to source packets.
>
>Regards,
>Jonas
>
>
>On Sun, 2004-12-19 at 10:26, sthaug at nethelp.no wrote:
>> > The LSP's are up on both site's (as seen via show mpls lsp).
>> > 
>> > However if i try to connect to a host directly connected to SITE-B from
>> > the SITE-C router itself, it doesnt work. 
>> > If it try to connect from a host behind SITE-B to a host behind SITE-C
>> > (and the other way round) this works.
>> 
>> You haven't provided nearly enough information.
>> 
>> - Are you using MPLS VPNs? If so, are you using RSVP or LDP for the
>> label distribution?
>> 
>> - Are you simply trying to use an MPLS LSP for the traffic? If so,
>> remember that by default only BGP learned routes are candidates to
>> be transmitted over the LSP. What's your BGP configuration?
>> 
>> - Are you using default-address-selection on the routers?
>> 
>> - Do the hosts simply have default routes to SITE-B / SITE-C, or
>> something more elaborate?
>> 
>> Steinar Haug, Nethelp consulting, sthaug at nethelp.no
>
>
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