From: Roman Rodichev (roman@iementor.com)
Date: Thu Nov 06 2008 - 03:53:25 ARST
TE is independent of LDP. Your MPLS VPN destinations are forwarded based on
the bgp next-hop loopback address. How you MPLS forward to that loopback,
using TE or LDP, is up to you. If TE tunnel is up, it will use TE label. If
TE tunnel is down and LDP is working, it will use LDP label.
You don't need to run LDP in order to use TE. In fact, you could remove
"mpls ip" configuration from all interfaces, and just use TE between PE's,
and your MPLS VPN would still work.
Finally, you could actually run LDP on top of TE tunnel (configure "mpls ip"
on the TE tunnel interface). Now you'll see three labels. TE label on top,
LDP label in the middle, MPLS VPN label on the bottom
Roman Rodichev
5xCCIE #7927 (R&S, Security, Voice, Storage, Service Provider)
Instructor, Content Developer
ieMentor Corporation http://www.iementor.com
Y!M: roman7927
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
abderrahim sadki
Sent: Wednesday, November 05, 2008 11:41 PM
To: ccielab@groupstudy.com
Subject: mpls label stack with TE and VPN
Hi,
I thought that when using MPLS TE with VPN I would end up with 3 labels in
the
packets(LDP-TE-VPN).
But from the Cisco books and lookig and packets on wireshark I see only 2
labels.
why is that? and when should I see 3 labels, is it when the tail of the TE
tunnel is not the same as the tail of the VPN tunnel?
Thanks,
Abderrahim
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