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RE: [Isis-wg] Question about Purge LSP in RFC 1142

"Les Ginsberg (ginsberg)" <ginsberg@cisco.com> Mon, 22 October 2007 20:02 UTC

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Subject: RE: [Isis-wg] Question about Purge LSP in RFC 1142
Date: Mon, 22 Oct 2007 13:00:59 -0700
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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Hannes Gredler <hannes@juniper.net>, "Theodore.Wang" <theodore.wang@gmail.com>
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> -----Original Message-----
> From: Hannes Gredler [mailto:hannes@juniper.net]
> Sent: Monday, October 22, 2007 12:32 PM
> To: Theodore.Wang
> Cc: isis-wg@ietf.org
> Subject: Re: [Isis-wg] Question about Purge LSP in RFC 1142
> 
> On Sun, Oct 14, 2007 at 07:14:16PM +0800, Theodore.Wang wrote:
> |    Therefore, is it possible to attach a new TLV in Purge LSP that
> defines
> |    the originator?
> 
> that would not help you to fix all pathologic cases -
> think of a misconfiguration where you have non-unique
> system-ids somewhere in the network ...

Hmmm...this is a different case entirely.

Now you will be receiving valid LSPs (i.e. no syntax errors, no checksum
errors) but they will look like they are self-generated when they have
actually be generated by your "evil-twin". This will force you to
regenerate or purge depending upon whether that particular LSP number is
part of your current self-generated set or not.

Throttling is important in this case to at least control the rate of
flapping, but ignoring the received LSPs is out of the question. The
network will churn until the misconfiguration is fixed.

   Les

> 
> all you can do is to ignore this LSP and throttle
> your own LSP re-origination.
> 
> /hannes
> 
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