The MPLS WG Archive

[Eyad Saheb <esaheb@hyperchip.com>]

Title: Dest IP addr in MPLS

Hello,

        I am unclear on the proper IP address to use as IP_DEST in RSVP-TE packets, especially when switches are involved.  Unfortunately, the "standards" docs aren't too clear on this point (IMHO).  I will illustrate my point:

1 - 2 - 3 - 4
  \        / 
   5 -----/

In the above topology, if Router 1 wants to establish a path to Router 4 through 2 & 3 it will create an RSVP-TE packet with IP_DEST = 4 & and ERO = 2,3,4.  Correct ?  This should override the IGP routing table which would probably indicate router 5 as the 'correct' next-hop from router 1.

However, consider the following:

     +-+
     | |- 2
  1 -| |- 3
     | |- 4
     +-+

In this case, all routers are connected via a switch.  If the same RSVP-TE packet is sent over this network, it would reach router 4 directly.  It would then reject the packet since it'snot the first node in the ERO.  Is this expected ?

Was RSVP-TE designed to be run over 'switched' networks ?

Regards,

        Eyad