The MPLS-OPS Archive

["MANISH SHAH" <man23ish@hotmail.com>]

 Please see my inline comments.

 ----- Original Message -----
 From: "nomit kalidhar" <nomit_kalidhar@infy.com>
 To: <mpls-ops@mplsrc.com>
 Sent: Wednesday, June 27, 2001 3:01 AM
 Subject: LDP timers


 >
 >
 > Hello,
 >
 > I had a small doubt in LDP regarding timers.
 >
 > A LSR maintains a Hold timer with each Hello djacency which it restarts
 > when it receives a hello message.
 >  When a session is established does it still have to exchange Hello
 > packets ? along with keep alive message ( if nothing is there to
 > transmit) ?
----- Yes, it is required to maintain the adjacencies, Without which the
session would come down.
 >
 > If it keeps on sending the hello message and the keep alive message,
 > then what happens if the hold timer gets over but keep alive is still
 > not over, is the connection terminated ?

 ----- Yes, the termination should be terminated because the next hop is not
reachable. Consider the following example.
                LSR1 -- LSR2 -- LSR3.
                    |------------------|

 Suppose that initially all the LSR's are adjacent to each other in a delta
topology. Suppose the link between LSR1 and LSR3 goes down. The TCP session
would re-establish itself via LSR2. But that is not the required case, we
need to have link state adjacencies in this case, which can be achieved only
through the hello hold timer. Hope i am clear...
Manish.


 > TIA
>
> Nomit
>
>
>
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