3Com Switch 8800 Family Configuration Guide

Configuring Integrated IS-IS 351
If the level is not specified, it defaults to setting CSNP packet broadcast interval for
Level-1.
By default, the CSNP packet is transmitted via interface every 10 seconds.
Setting LSP packet generation interval
As specified in the IS-IS protocol, when an event takes place, the related LSP
packet should be generated again. If LSP packets are generated frequently, a large
amount of resources will be occupied and the route’s efficiency will be affected.
The exponent digression method can improve the efficiency to a certain degree.
The LSP packet generation interval can you be configured as per the actual
requirement.
Perform the following configuration in IS-IS view.
Setting the LSP packet transmission interval
LSP carries the link state records for propagation throughout the area.
Perform the following configuration in interface view.
By default, the LSP packet is transmitted via the interface every 33 milliseconds.
Setting LSP packet retransmission interval
Over a p2p link, if the local end does not receive the response within a period of
time after it sends an LSP packet, it considers that the originally transmitted LSP
packet has been lost or dropped. In order to guarantee the transmission reliability,
the local router will retransmit the original LSP packet.
Perform the following configuration in interface view.
Tab le 325 Set the CSNP packet broadcast interval
Operation Command
Set the CSNP packet broadcast interval isis timer csnp seconds [ level-1 | level-2 ]
Restore the default CSNP packet broadcast
interval on the interface
undo isis timer csnp [ level-1 | level-2 ]
Tab le 326 Set LSP packet generation interval
Operation Command
Set LSP packet generation interval timer lsp-generation x y z [ level-1 | level-2 ]
Restore the default value of LSP packet
generation interval
undo timer lsp-generation x y z [ level-1 |
level-2 ]
Tab le 327 Set the LSP packet transmission interval
Operation Command
Set LSP packet interval on the interface. isis timer lsp time
Restore the default LSP packet interval on the interface undo isis timer lsp