F3726, F3211, F3174, R5135, R3816-HP Firewalls and UTM Devices Network Management Command Reference-6PW100

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You can configure keywords level-1 and level-2 only on broadcast interfaces. Before you do that, enable
IS-IS on the interface.
As the shorter the interval is, the more system resources are occupied, you should configure a proper
interval as needed.
If no level is specified, the hello interval applies to both Level-1 and Level-2.
Examples
# Configure Level-2 hello packets to be sent every 20 seconds over GigabitEthernet 1/1.
<Sysname> system-view
[Sysname] interface GigabitEthernet 1/1
[Sysname-GigabitEthernet1/1] isis timer hello 20 level-2
Related commands
isis timer holding-multiplier
isis timer holding-multiplier
NOTE:
This command is not available in loopback interface view.
Use isis timer holding-multiplier to specify the IS-IS hello multiplier.
Use undo isis timer holding-multiplier to restore the default.
Syntax
isis timer holding-multiplier value [ level-1 | level-2 ]
undo isis timer holding-multiplier [ value ] [ level-1 | level-2 ]
Default
The default IS-IS hello multiplier is 3.
Views
Interface view
Default command level
2: System level
Parameters
value: Number of hello intervals, in the range of 3 to 1000.
level-1: Applies the number to the Level-1 IS-IS neighbor.
level-2: Applies the number to the Level-2 IS-IS neighbor.
Usage guidelines
With the IS-IS hello multiplier configured, a router can uses hello packets to notify its neighbor router of
the adjacency hold time (hello multiplier times hello interval). If the neighbor router receives no hello
packets from this router within the hold time, it declares the adjacency down. You can adjust the
adjacency hold time by changing the hello multiplier or the hello interval on an interface.