ISIS LSP purge

Studying IS-IS , I came across this statment and wonder now how this could
be configured
and why it could make sense to not to purge an invalid LSP ?

"...If a router receives an LSP with an incorrect checksum, the router will
cause a purge of the LSP by setting the remaining lifetime value to 0,
removing the body and reflooding it. This triggers the LSP originator to
send a new LSP. This behavior is different from that of OSPF, where only the
originating router can purge an LSP.
*IS-IS can be configured so that LSPs with incorrect checksums are not
purged*, but the router that originated the LSP will not know that the LSP
was not received*. *
..."

http://www.cisco.com/en/US/products/ps6599/products_white_paper09186a00800a3e6f.shtml

thanks, keti

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Received on Tue Sep 14 2010 - 22:23:00 ART