Extreme Networks ExtremeWare 7.7, Command Reference Manual

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1642 ExtremeWare 7.7 Command Reference Guide
VRRP Commands
configure vrrp vlan vrid
configure vrrp vlan <vlan name> vrid <number> [priority <priority_number> |
advertisement-interval <ad_interval_number> | dont_preempt | preempt]
Description
Configures VRRP parameters.
Syntax Description
Default
N/A
Usage Guidelines
This command may be used to configure a VRRP router priority, advertisement interval, and preempt
mode.
The priority is used to determine which VRRP router takes over when the master fails over. A value of
255 is reserved for the router that is configured with the virtual router IP address (the IP address
owner). A value of 0 is reserved for the master router’s use to indicate it is releasing responsibility for
the virtual router.
The advertisement interval specifies the interval between advertisements sent by the master router to
inform the backup routers that it is alive. The master down interval is the interval that a backup router
waits after the last received advertisement before it determines that the master router is down.
If you have an extremely busy CPU, a short dual master situation can occur. To avoid this, increase the
advertisement interval.
The preempt mode controls whether a higher priority backup router preempts a lower priority master.
preempt
allows preemption.
dont_preempt
prohibits preemption. The default setting is
preempt
. The
router that owns the virtual router IP address always preempts, independent of the setting of this
parameter.
Example
The following commands set a priority and advertisement interval for the VRRP router on VLAN
vrrp-1, and sets the preempt mode to disallow preemption:
vlan name Specifies the name of a VRRP VLAN.
number Specifies a Virtual Router ID (VRID). Value can be in the range of 1-255.
priority_number Specifies the priority value to be used by this VRRP router in the master election process.
The range is 1 - 254. The default value is 100.
ad_interval_number Specifies the time interval between advertisements, in seconds. The range is 1 - 255. The
default value is 1 second.
dont_preempt Specifies that this router, as master, may not be preempted by a higher priority backup
router.
preempt Specifies that this router, as master, may be preempted by a higher-priority backup router.
This is the default.