The MPLS WG Archive

[Manish Godara <wiseguy@cs.stanford.edu>]

Thanks Jane.  Also, I think the BGP/MPLS VPNs may need to
pop two labels at the PE router if the penultimate hop is not popping
the top label, right?

thanks,
manish

On Tue, 17 Jul 2001, Jiang, Donghua (Donghua) wrote:

>
> Manish,
>
> I could not see why it is not possible.
>
> Regards,
> Jane
> -----Original Message-----
> From: wiseguy@cs.stanford.edu [mailto:wiseguy@cs.stanford.edu]
> Sent: Tuesday, July 17, 2001 12:06 PM
> To: mpls@UU.NET
> Subject: [MPLS] Popping Multiple Labels
>
>
>
> Hi,
>
> I was wondering if there are any possible scenarios in which
> a node might pop multiple labels from the stack.  One case
> I was thinking of is : a node is endpoint of a tunnel (T1) and
> is also a penultimate hop for another tunnel (T2) and T2 is
> tunneled over T1!  Maybe this is not a valid scenario but I
> would like to check.
>
> I appreciate any help.
>
> thanks,
> manish
>
> PS: Scenario
>
>
>   +-----+         +-------+               +-------+         +------+
>   |     | ===~==  |       |  ====~~===    |       +---------+      |
>   | L1  |         | L21   |               | L2n   |         | L3   |
>   +-----+         +-------+               +-------+         +------+
>
>                   <------------  T1 -------------->
>          <--------------------------T2---------------------->
>
>