3Com Switch 7750 Series
Command Reference Guide – Routing Protocol Chapter 4 Integrated IS-IS Configuration Commands
4-24
4.1.26 isis timer holding-multiplier
Syntax
isis timer holding-multiplier value [ level-1 | level-2 ]
undo isis timer holding-multiplier [ level-1 | level-2 ]
View
Interface view
Parameter
value: Number of invalid Hello packets of an IS-IS neighbor, in the range of 3 to 1,000.
level-1: Specifies the number of invalid Hello packets of a Level-1 IS-IS neighbor.
level-2: Specifies the number of invalid Hello packets of a Level-2 IS-IS neighbor.
If neither the level-1 keyword nor the level-2 keyword is specified, the command
takes effect on both level-1 and level-2 IS-IS neighbors.
Description
Use the isis timer holding-multiplier command to configure the number of invalid
Hello packets for an IS-IS neighbor. When a specified number of Hello packets are not
received from a neighbor, the neighbor will be considered as invalid.
Use the undo isis timer holding-multiplier command to resume the default
configuration.
The number of invalid Hello packets is three by default.
You can configure the time intervals of Hello packets separately for Level-1 and
Level-2 peers. But for point-to-point link, as there is only one kind of Hello packet, so
you need not specify Level-1 or Level-2.
In fact, the number of invalid Hello packets is used to configure Holddown time. If a
router receives no Hello packet from peer router within Holddown time, it will take the
peer router as invalid. Depending on the interface configuration, the Holddown time
can be configured differently for different routers within an area. You can adjust the
Holddown time by changing either the time interval for sending Hello packets or the
number of invalid Hello packets.
Related command: isis timer hello.
Example
# Configure the number of Level-2 Hello packets signifying peer invalid as 5 for
Vlan-interface, that is, if no Hello packet is received from the interface within 5 Hello
packet time intervals, the IS-IS peer is considered as invalid.
<3Com> system-view
System View: return to User View with Ctrl+Z.