From: Victor Cappuccio (victor@ccbootcamp.com)
Date: Thu Jun 21 2007 - 02:15:46 ART
Hi
"Traffic Engineering with MPLS
By Eric Osborne CCIE #4122, Ajay Simha CCIE #2970"
TE tunnels that must start and end in the same area (or level, rather than
area This meant that not only could you not have a TE tunnel that spanned
multiple areas, you couldn't have a router that was connected to multiple
areas and had TE tunnels in each area independently. However, this restriction
can be overcome using interarea tunnels.
if you want to build interarea tunnels, there's a bit of headend work to be
done. You have to specify an explicit path for the tunnel to take. This
explicit path must use the loose ERO "EXPLICIT_ROUTE (often called the ERO or
Explicit Route Object)"
When you configure an explicit path, each hop in that path is implicitly known
as a strict hop.
When a tunnel has an explicit route starting with strict hops, all the strict
hops are checked against the TE database to make sure that they're valid.
Because enabling interarea tunnels doesn't change the information flooding
scheme, Using the next-address loose command is a way of telling the next
node in the ERO (the ABR, the one that has more than one TE database) that it
needs to figure out what to do next.
More about this
http://www.cisco.com/en/US/tech/tk436/tk832/tech_brief09186a00801f0b2d.html
http://www.nanog.org/mtg-0002/ppt/raszuk.ppt
HTH
thanks,
Victor Cappuccio.-
- CCSI# 31452
Network Learning Inc - A Cisco Sponsored Organization (SO) YES! We take
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-----Original Message-----
From: nobody@groupstudy.com on behalf of Ramya S
Sent: Thu 6/21/2007 4:20
To: ccielab@groupstudy.com
Subject: next hop
Hi all,
In MPLS Traffic-engineering when we are specifying the explicit path what is
the difference between next-address w.x.y.z and next-address loose
w.x.y.z. As I know the "next- address loose" helps in creating interarea
tunnels.
Ramya Sen
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