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[mpls] LDP newbie question

  • From: "Yu Yi" <yuyi@nortel.com>
  • Date: Tue, 26 Dec 2006 12:58:42 +1100
  • Thread-Index: AccmMVYwmgsiPvFfQG+Ob5rRVk+/8ACXsxZw
  • Thread-Topic: [mpls] LDP newbie question
  • X-MIME-Autoconverted: from quoted-printable to 8bit by cell.onecall.net id kBQ1vqs12165

Hi Abhishek,

   It is because that LDP2 think it is possible that LDP1 will want LDP2 send a lable if the next hop is change to LDP2 on LDP1.   But in your case it is impossible. Because the fec(1.1.1.1) is a loopback IP address on LDP1.  There is no chance for LDP1 to select LDP2 as the nexthop for 1.1.1.1.  In this case LDP1 should release the label which LDP2 send.
   Please consider another case:
     |------------------------------|
  LDP1 -----  LDP2 ----- LDP3

    1.1.1.1 is a loopback IP address on LDP1.  So LDP3 will receive a mapping from LDP2 for fec 1.1.1.1(Suppose the metric of link between LDP1/LDP3 is very large).  LDP3 will send a mapping to LDP2. This label will be used if the link between LDP1/LDP2 is down.

Thanks,
Yu

-----Original Message-----
From: Abhishek Verma [mailto:abhishekv.verma@gmail.com] 
Sent: 2006Äê12ÔÂ23ÈÕ 9:23 AM
To: mpls@lists.ietf.org
Subject: [mpls] LDP newbie question

Hi,

LDP1 -- LDP2

I have two LDP peers 1 and 2. LDP1 advertises its loopback IP address (say 1.1.1.1) to LDP2 with a label of 3. Is there a reason for LDP2 too also advertise 1.1.1.1 back to LDP1 with some label?

Thanks,
Abhishek

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