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112 CHAPTER 5: IP ROUTING PROTOCOL OPERATION
Perform the following configuration in VLAN interface view..
If the level is not specified, the default setting is, Level-1 routing cost.
The value parameter is configured according to the link state of the Interface.
By default, the routing cost of IS-IS on an interface is 10.
Setting the Hello Packet Broadcast Interval
The IS-IS periodically sends Hello packets from the Interface, and the routers
maintain adjacency through the transmission and receipt of Hello packets The
Hello packet interval can be modified.
Usually, on broadcast links, there exist level-1 and level-2 hello packets. If you
want a different hello interval for Level-1 and Level-2, you must set the intervals
separately. However, there are two exceptions. One exception is when there is no
level separation in the link, parameters of level-1 and level-2 need not be specified
in the command.
The other exception is that attributes of the packets do not need to be set if hello
packets are not separated according to level-1 and level-2 on the p2p links.
Perform the following configurations in VLAN interface view..
By default, Hello packets are transmitted on an interface every 10 seconds.
Setting the CSNP Packet Broadcast Interval
The CSNP packet is transmitted by the DIS over the broadcast network to
synchronize the link state database (LSDB). The CSNP packet is regularly broadcast
over the broadcast network at an interval, which can be set by users.
Perform the following configuration in VLAN interface view.
Table 58 Setting IS-IS Link State Routing Cost
Operation Command
Set the routing cost of the interface isis cost value [ level-1 | level-2 ]
Restore the default routing cost of the
interface
undo isis cost [ level-1 | level-2 ]
Table 59 Setting the Hello Packet Broadcast Interval
Operation Command
Set Hello packet interval, measured in
seconds.
isis timer hello seconds [ level-1 | level-2 ]
Restore the default Hello packet interval on
the interface
undo isis timer hello [ level-1 | level-2 ]
Table 60 Setting the CSNP Packet Broadcast Interval
Operation Command
Set the CSNP packet broadcast interval,
measured in seconds
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 ]