3Com 3C13636 Configuration Manual page 649

3Com Router 3000 Ethernet Family
Configuration Guide
I. Configuring the Hello packet broadcast interval
IS-IS sends hello packets on an interface periodically. Routers maintain their
neighboring relationship through the sending/receiving of Hello packets. The
transmission interval of hello packets can be changed through configuration.
Table 5-7 Configure the hello packet broadcast interval
Set the transmission interval of hello
packets on an interface, with the time
unit being second
Restore the default transmission interval
of hello packets on an interface
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 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). The
system will set the broadcast intervals of all packets as that of the level-1 hello packet.
The other 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.
By default, Hello packets are transmitted on interface every 10 seconds.
II. Configuring the CSNP packet broadcast interval
The CSNP packet is transmitted by the DIS (Designated IS) 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.
Table 5-8 Configure the CSNP packet broadcast interval
Set the CSNP packet broadcast interval,
measured in seconds
Restore the default CSNP packet
broadcast interval on the interface
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 second.
III. Configuring the LSP packet transmission interval
LSP carries the link state records for propagation throughout the area.
Operation
Operation
3Com Corporation
5-10
Chapter 5 Integrated IS-IS Configuration
Command
isis timer hello seconds [ level-1 |
level-2 ]
undo isis timer hello [ level-1 |
level-2 ]
Command
isis timer csnp seconds [ level-1 |
level-2 ]
undo isis timer csnp [ level-1 |
level-2 ]