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RE: Default route FEC for LDP.

  • From: "kartik" <kartik.kashyap@estelcom.com>
  • Date: Thu, 29 Jan 2004 21:00:22 +0530
  • Importance: Normal
  • Resent-Date: Thu, 29 Jan 2004 11:20:56 -0500
  • To: "bageshri kundu" <bageshrikundu@yahoo.com>, <mpls-ops@mplsrc.com>
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Hi Kartik,
 
No, this is not LDP Discovery. The router has already formed an hello adjacency with the peer & established a TCP session. Now, it is trying to request a label for a FEC(default fec in this case) from its downstream neighbor. My question is whether the downstream router sends a Notification "No Route"(if it does not have the default route in its routing table) or it sends a Label Mapping with some label?
 
Thanks,
Bageshri

kartik <kartik.kashyap@estelcom.com> wrote:

Dear Bageshri

Dear Bageshwari

 

 

In MPLS labels are only created for a specific prefix. No label is created for a default route. As per you as there is no  route in the downstream LSR the local LSR will create a local label for that specific prefix but it will not get a remote label for that prefix from the downstream LSR.

 

Regards

Kartik

 

 

-----Original Message-----
From: bageshri kundu [mailto:bageshrikundu@yahoo.com]
Sent: Thursday, January 29, 2004 8:04 PM
To: kartik; Yongjun Im; mpls-ops@mplsrc.com
Subject: RE: [MPLS-OPS]: Default route FEC for LDP.

 

 

 

Are u talking about the LDP Discovery.

 

Regards

Kartik

 

 

-----Original Message-----
From: bageshri kundu [mailto:bageshrikundu@yahoo.com]
Sent: Thursday, January 29, 2004 6:38 PM
To: Yongjun Im; mpls-ops@mplsrc.com
Subject: Re: [MPLS-OPS]: Default route FEC for LDP.

 

Thanks for the reply. What if the router does not have the default route? In that case, does it send a Notification with status "No Route" like with any other route for which it does not have an entry in its routing table.

 

Thanks again,

Bageshri

Yongjun Im <yjim@lge.com> wrote:

<82 size=2>If the router, which received a label request with FEC for a default route, has the default route,

<82 size=2>then it is supposed to send a label mapping <82 size=2>for it. Any valid label will be allocated,

<82 size=2>because <82 size=2>in terms of label allocation, a default route makes no difference 

<82 size=2>in comparison to non-default routes.

----- Original Message -----

 

To: mpls-ops@mplsrc.com

Sent: Thursday, January 29, 2004 5:36 AM

Subject: [MPLS-OPS]: Default route FEC for LDP.

 

Hi,

 

What is a router supposed to do on receiving a Label request with the FEC tlv for a default route(0.0.0.0/0)? Is it supposed to send a Notification back with status "No route" or send a Label mapping for the same? If the latter is true, what is the label?

 

Thanks,

Bageshri

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