Subject: PIM-SM Hello Hold Time

From: "Subrata Sa" <[email-masked]>
Date: Thu, 20 Sep 2001 00:28:17 -0800

Hi,

I want some clarification on "Hold Time" option and Hello Hold Time.

Section 4.6.2 says:
------------------
Router uses a timer(NLT) to time out the neighbor state 
when it becomes stale.This is reset to Hello Holdtime 
whenever a Hello message is received, or to the value 
specified in the message, if the hold time option is used.

>> Indicates that Hello message without "Hold Time" option 
is valid. (?)

Section 4.9.2 says:
------------------
The "Hold Time" option MUST be implemented. 

>> This contradicts previous indication. (?)

Section 4.11 says:
-----------------
The Holdtime in a Hello Message should be set to (3.5 * Hello_Period),
giving a default value of 105 seconds.

Now consider the two inferences given below:

A. Neighbor Liveness Timer for neighbor X is set to (3.5 * 
Hello_Period)
if Hold Time option is not included in the incoming Hello message from 

neighbor X.

B. Router has to set HoldTime to (3.5 * Hello_Period) in an outgoing 
Hello message.

Please let me know if A, B, or both are correct.

Thanks,

-Subrata
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