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120 CHAPTER 5: IP ROUTING PROTOCOL OPERATION
Perform the following configurations in IS-IS view..
By default, the CPU is released after 5000 routes are processed by the SPF of IS-IS.
Setting the SPF Computing Interval
When the IS-IS LSDB changes, the router will compute the shortest path again.
However, an immediate calculation upon every change will occupy too many
resources and affect the efficiency of the router. If the SPF computing interval is
set, and the LSDB changes, the SPF algorithm will be run after the SPF interval
times out.
Perform the following configurations in IS-IS view..
If the level is not specified, it defaults to setting the SPF computing interval for
Level-1.
By default, the SPF calculation runs every 5 seconds.
Enabling or Disabling the Interface to Send Packets
Use the silent-interface command to prevent an interface from sending IS-IS
routing information to a router in a network.
Perform the following configurations in IS-IS view..
By default, the interface is allowed to receive and send IS-IS packets.
The silent-interface command is only used to prevent the IS-IS packets from
being sent on the interface, but interface routes can still be sent from other
interfaces.
Table 79 Setting SPF to Release CPU Resources
Operation Command
Set the number of routes to process before
releasing the CPU
spf-delay-interval number
Restore the default configuration undo spf-delay-interval
Table 80 Setting SPF Computing Interval
Operation Command
Set SPF computing interval timer spf second [ level-1 | level-2 ]
Restore default SPF computing interval undo timer spf [ level-1 | level-2 ]
Table 81 Enabling/Disabling the Interface to Send IS-IS Packets
Operation Command
Prevent the interface from sending IS-IS
packets
silent-interface silent-interface-type
silent-interface-number
Allow the interface to send IS-IS packets undo silent-interface silent-interface-type
silent-interface-number