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LDP unsolicited

  • From: "Igor Achkinazi" <achkinazi@hotmail.com>
  • Date: Tue, 05 Feb 2002 19:09:52 +0000
  • X-OriginalArrivalTime: 05 Feb 2002 19:09:54.0734 (UTC) FILETIME=[B1EAACE0:01C1AE78]
  • X-Originating-IP: [12.125.43.134]

Hi,

How does LDP spec/rfc3036 address race condition of simultaneous Label 
Request and Label Mapping being sent for the same prefix in unsolicited 
label advertisement mode?

Section "A.1.6. Recognize New FEC" says we need to send label request to 
downstream peer regardless of configured label advertisement mode. New FEC 
was detected immediately after LDP was configured, so we have not got label 
yet at this moment.

At the same time peer sends us Label Mapping with label for the same prefix 
according to configured unsolicited advertisement mode.

This scenario ends up with two labels for the same prefix, which can be 
quite a waste of label space for big number of routes.

I know, LDP spec is stable for big period of time, and may be I just missed 
something.

Thanks for help,
Igor Achkinazi


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