Switch 7700 Configuration Guide, v2

IS-IS 105
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 Interface is 10.
Setting the Hello Packet Broadcast Interval
The IS-IS periodically sends the Hello packets from the Interface and the routers
maintain the adjacency through the transmitting/receiving of the Hello packets
The Hello packet interval can be modified.
Usually, on the broadcast links, there exist level-1 and level-2 hello packets. For
different packets, different broadcast intervals should be set. 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 (adopt
the default values). So that the system will set the broadcast intervals of all packets
as that of the level-1 hello packet.
The other exception is if hello packets are not separated according to level-1 and
level-2 on the p2p links, the attribute of the packets need not be set either.
Perform the following configurations in VLAN interface view..
By default, Hello packets are transmitted on 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 configurations in VLAN interface view..
Restore the default routing cost of the
interface
undo isis cost [ level-1 | level-2 ]
Table 55 Set 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 56 Set 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 ]
Table 54 Set IS-IS Link State Routing Cost
Operation Command