From: Vin Mendoza (vinm) (vinm@cisco.com)
Date: Wed Nov 26 2008 - 01:44:15 ARST
Ahh,
Thanks for that, I remember now, but you made it very clear.
Thanks,
Vin
-----Original Message-----
From: Roman Rodichev [mailto:roman@iementor.com]
Sent: Tuesday, November 25, 2008 10:42 PM
To: Vin Mendoza (vinm); 'mreiks'
Cc: 'Cisco certification'; 'Cisco certification'
Subject: RE: MPLS TE + RSVP+LDP
When a multicast IP packet is received, IOS will perform RPF check on
the source of the multicast packet to make sure it arrived on the
correct interface. MDT tunnels are sourced from loopback interfaces,
same loopbacks that are reachable via the TE tunnels. MDT tunnel packets
destination is multicast. So when a PE receives an MDT packet on a
physical interface, it does an RPF check and says "Oh, this source is
supposed to arrive on this TE tunnel interface" and multicast breaks.
That command fixes the problem
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: Vin Mendoza (vinm) [mailto:vinm@cisco.com]
Sent: Tuesday, November 25, 2008 9:37 PM
To: Roman Rodichev; mreiks
Cc: Cisco certification; Cisco certification
Subject: RE: MPLS TE + RSVP+LDP
What does multicast-intact do?
Vin
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Roman Rodichev
Sent: Tuesday, November 25, 2008 10:20 PM
To: 'mreiks'
Cc: 'Cisco certification'; 'Cisco certification'
Subject: RE: MPLS TE + RSVP+LDP
You are doing MDT?
under router ospf or router isis in the core put:
mpls traffic-eng multicast-intact
Roman Rodichev
5xCCIE #7927 (R&S, Security, Voice, Storage, Service Provider)
Instructor, Content Developer
ieMentor Corporation http://www.iementor.com
Y!M: roman7927
From: mreiks [mailto:marakalas.molefe@gmail.com]
Sent: Tuesday, November 25, 2008 9:15 PM
To: Roman Rodichev
Cc: Cisco certification; Cisco certification
Subject: Re: MPLS TE + RSVP+LDP
Hmm, my excitement was short-lived there. Now my multicast tunnel
between the two PE routers is broken after disabling "mpls ip" on the
interfaces.
Any idea?
On Wed, Nov 26, 2008 at 5:12 AM, mreiks <marakalas.molefe@gmail.com>
wrote:
Wow, tx a lot Roman, it's working now without "mpls ip" on the SP
interfaces. I only had the TE tunnel configured only on the one PE. Much
appreciated.
On Wed, Nov 26, 2008 at 4:38 AM, Roman Rodichev <roman@iementor.com>
wrote:
Hello,
You don't need LDP in order to run MPLS VPN over TE tunnels. When you
say you "disable LDP on the interfaces", I assume you are disabling
"mpls ip" on the physical interfaces. In a simple CE1 - PE1 - P - PE2 -
CE2 network, make sure you have a TE tunnel from PE1 to PE2 and from PE2
to PE1. Make sure you are using "tunnel mpls traff autoroute announce"
so that PE1 and PE2 loopbacks are reachable via TE tunnels instead of
the IGP path. You can remove LDP between PE1, P and PE2 router, and your
MPLS L3VPN will work.
By the way, you don't need "mpls ip" on the TE tunnel interfaces if
their headends and tailends are on PE routers (not on P routers).
If you have a specific scenario, please present.
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
mreiks
Sent: Tuesday, November 25, 2008 2:37 PM
To: Cisco certification; Cisco certification
Subject: MPLS TE + RSVP+LDP
Hi
I am finding it diffucult to understand whether RSVP TE can be run
instead of LDP/TDP. I am able to establish the tunnel with TE but when I
disable LDP on the interfaces, my VPN sites cannot ping each other,
until such time I enable LDP. Is this normal? With MPLS VPNs do we
always have to run either LDP/TDP and have RSVP also if we want TE?
Tx.
Blogs and organic groups at http://www.ccie.net
This archive was generated by hypermail 2.1.4 : Mon Dec 01 2008 - 08:18:32 ARST