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User Manual - Configuration Guide (Volume 3)
Versatile Routing Platform
Chapter 2
Configuration of HSRP
2-3
Note:
1) Please note that if some Ethernet interface configured with HSRP has its IP address changed, its HSRP
will become disabled.
2) If a route is configured with several HSRP Hot Standby Group, then there can be at most one Hot
Standby Group without specified virtual IP address.
2.2.3 Setting Router’s Priority in HSRP Hot Standby Group
HSRP determines the state of every router in Hot Standby group according to their
priority parameters, i.e., a router with both the highest priority and a virtual IP address
will be an active router, leaving others in the standby or listen state.
Please use the following command in the Ethernet interface configuration mode.
Table LC-2-2 Set router’s priority in HSRP Hot Standby group
Operation Command
Set router’s priority in HSRP Hot Standby group. standby [group-number] priority [priority-value]
Priority-value is its priority, the larger the value, the higher the priority, and it has a value
range of 0~255 and a default value of 100.
2.2.4 Setting Router’s Preemption Mode in HSRP Standby Group
Once a Router in the Standby group becomes an active Router, as long as the active
Router does not break down, other Routers will not become active even if they have a
higher priority level later on, except that they are set in a preemption working mode. If a
router is set in a preemption mode in an HSRP hot standby group, once it finds out that
it has a higher priority than the present active router, it will ‘preempt ’ to become an
active router. The previous active router will therefore exit its active state to become a
‘standby’ or ‘listen’ router.
Please use the following commands in Ethernet interface configuration mode.
Table LC-2-3 Set router’s priority in HSRP hot standby group
Operation Command
Set router’s preemption working mode in HSRP hot standby group. standby [group-number] preempt
Forbid router’s preemption working mode in HSRP hot standby group. no standby [group-number] preempt
By default it means no router is set in a preemption mode in any HSRP hot standby
group.
2.2.5 Setting HSRP Authorization Word
HSRP authorization word is used to check other routers’ validity in the same hot
standby group.
Please use the following commands in the Ethernet interface configuration mode.