The MPLS-OPS Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] penultimate hop popping!!!
Hi all,
I have a query regarding penultimate hop popping.
Please refer to the following figure ..
0 --- 1 --- 2 --- 3 ---- 4 --- 5
---------- ----------
MPLS DOMAIN.
Lets assume that nodes 1,2,3 and 4 form the MPLS
domain. Lets say node 0 and node 5 are ip nodes.
For traffic generated by node 0 and destined to node
5 the path would be 0->1->2->3->4->5 where 1-2-3-4 is
an LSP.
LSR 4 knows that it is the egress because its
adjacent is not LSR. But LSR 3 ( penultimate node for
that LSP)has to do penultimate hop popping .. but it
has no way to know about this unless informed by LSR
4.
QUERY : How does LSR 4 inform LSR 3 that it has to do
penultimate hop popping ... DOES it gives LSR 3 an
IMPLICIT NULL LABEL.
Any pointers in this area are welcome. PLease also
suggest other points that i may be missing.
Thanks to one and all!
Sincerely,
Abrar.
=====
Abrar Hussain.
Graduate Student/Network Designer.
The University of Toledo.
Toledo,OH.
__________________________________________________
Do You Yahoo!?
Yahoo! Sports - Coverage of the 2002 Olympic Games
http://sports.yahoo.com
-------
The MPLS-OPS Mailing List
Subscribe/Unsubscribe: http://www.mplsrc.com/mplsops.shtml
Archive: http://www.mplsrc.com/mpls-ops_archive.shtml
|
|