Re: DIS Identification in ISIS

Hi Malik,

It's very easy to identify the DIS using the command "show clns
is-neighbor". The router under the column circuit-id is the DIS.

You can also identify the DIS with the command you mentioned: "show isis
database". In the output you pasted, you got two routers with an LSP-ID
different than 00-00, so one of them is the DIS. But if you look carefully,
R9.03-00 has an LSP HoldTime of 0 (94). Because of that, we can conclude
that R9 was DIS in some moment, but now it's R6.

I dont really know why sometimes the DIS takes the ID 01-00, and sometimes
other number. I will get deeper on it. Anyone can make it clear?

Regards,

www.initialdraft.com

On Fri, Mar 11, 2011 at 12:24 AM, Malik Nouman Ahmad <djmalik_at_gmail.com>wrote:

> Hi,
>
> It is said that "show isis database" can be used to identify DIS. Following
> is the output:
>
> IS-IS Level-1 Link State Database:
> LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
> R6.00-00 0x0000000C 0x5962 922 0/0/0
> R6.01-00 0x00000001 0x092A 923 0/0/0
> R9.00-00 * 0x0000000D 0xFCAC 929 0/0/0
> R9.03-00 * 0x00000001 0xA150 0 (94) 0/0/0
>
> Now now is 01-00 always DIS or is it the highest non-zero value (i.e. 03-00
> in this case)?
>
> Also to disable DIS election on a link is "isis network point-to-point"
> enough?
>
> Thanks,
> Malik
>
>
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Received on Tue Apr 26 2011 - 12:57:38 ART