[c-nsp] VRF question

Yasser Aly yasser.aly at noorgroup.net
Mon Oct 11 10:35:01 EDT 2004


  Just to make things more clear to me I would like to confirm something. I
would like to confirm the usage of the command " mpls ip default-route ".

 Is this command to be applied on the router providing a gateway for other
routers ?

 Does this command act as a replacement for using a default route in the LSR
(P router) pointing to a certain destination as your gateway ?

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Marko Milivojevic
Sent: Monday, October 11, 2004 4:14 PM
To: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] VRF question

>>    I think you are wrong about the above statement. Think about PHP here.

>> Packets destined for the next LSR will not be tagged, while the 
>> packets that are passing through the next node will be labeled.
> Yes, you are right. But I was referering to run plain IPv4 and MPLS 
> simultaneously on the same interface. Without PHP the the packets 
> would be labeled, but PHP optimizes the label lookup at the receiver.

    Rodney already gave you another example, but I will give you another. 
Even without PHP, say you have LSR that has only default route to a certain
destination. Unless you specifically instruct LSR to do so (mpls ip
default-route), packets destined for this destination will not be labelled. 
Packets destined for "known destination" out the same interface will be
labelled as usual.


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