Subject: RE: [Isis-wg] Pseudonode

From: Jeff Parker <[email-masked]>
Date: Mon, 13 Aug 2001 10:37:21 -0400

> The DR is selected from the number of ISs on the LAN and all 
> the ISs convey the info that they are connected to the 
> pseudonode to the DR only. All manual adjacencies are 
> advertised by the individual ISs only .. i.e this
> information is multicasted on the LAN. 

So far so good...

> The DR knows which all ISs are there
> on the lan and its only this information which is included in 
> its CSNP .. 
 
There are two distinct things that the LAN DIS (DR) does

1) Sending periodic CSNPs to keep members of the LAN in sync

2) Acts as representative of the LAN to reduce the amount
   of adjacencies advertised in LSPs.  

The CSNP is merely a description of what the sender has
in it's LSP database, and has no relation to which
IS's are on the LAN.  

> PSNPs are issued by the individual ISs as an 
> acknowledgment or when they see
> that their database differs from that of the DR.

Right.  You can use these to "pull" an LSP that
you have learned about through a CSNP.

- jeff parker
- axiowave networks
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