3Com S7906E - Switch, Configuration Manual

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1-15
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When VRRP works in the load balancing mode, the virtual IP address cannot be the same with IP
address of any interface in the VRRP group, that is, in the load balancing mode, the VRRP group
does not have an IP address owner.
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For the S7900E series, the maximum number of VRRP groups on a switch is 128; and the
maximum number of virtual IP addresses for a VRRP group is 16.
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A VRRP group is removed after you remove all the virtual IP addresses in it. In addition,
configurations on that VRRP group no longer take effect.
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The virtual IP address of the virtual router can be either an unused IP address on the segment
where the VRRP group resides or the IP address of an interface on a router in the VRRP group. In
the latter case, the router is called the IP address owner.
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Removal of the VRRP group on the IP address owner will cause IP address collision. In such a
case, it is recommended to modify the IP address of the interface on the IP address owner to
resolve the collision.
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The virtual IP address of the VRRP group cannot be 0.0.0.0, 255.255.255.255, loopback
addresses, non class A/B/C addresses or other illegal IP addresses such as 0.0.0.1.
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Only when the configured virtual IP address and the interface IP address belong to the same
segment and are legal host addresses can the VRRP group operate normally. If the configured
virtual IP address and the interface IP address do not belong to the same network segment, or the
configured IP address is the network address or network broadcast address of the network
segment that the interface IP address belongs to, the state of the VRRP group is always initialize
though you can perform the configuration successfully, that is, VRRP does not take effect in this
case.
Configuring Router Priority, Preemptive Mode and Tracking Function
Configuration prerequisites
Before you configure these features, you should first create a VRRP group on the interface and
configure a virtual IP address for it.
Configuration procedure
By configuring router priority, preemptive mode, interface tracking, or a Track object, you can decide
which router in the VRRP group serves as the Master.
Follow these steps to configure router priority, preemptive mode and the Track object tracking function:
To do… Use the command… Remarks
Enter system view
system-view
—
Enter interface view
interface interface-type
interface-number
—
Configure router priority in the
VRRP group vrrp vrid virtual-router-id
priority
priority-value
Optional
100 by default.