Configuring The Vrrpv3 Advertisement Interval; Configuring The Vrrpv3 Virtual Router Priority - Alcatel-Lucent OmniSwitch 6850-48 Network Configuration Manual

Configuring VRRP
In the above example, the vrrp3 address command specifies that VRRPv3 virtual router 6 on VLAN 4
will be used to backup IPv6 address
the vrrp3 command.
If a virtual router is to be the IP address owner, then all addresses on the virtual router must match an
address on the switch interface. This includes the virtual router's link local address. In other words, a
virtual router can not be the IP address owner if its link local address does not match the interface link
local address.
To remove an IPv6 address from a virtual router, use the no form of the vrrp3 address command. For
example:
-> vrrp3 6 4 disable
-> vrrp3 6 4 no address fe80::200:5eff:fe00:20a
In this example, VRRPv3 virtual router 6 is disabled. (A VRRPv3 virtual router must be disabled before
IPv6 addresses may be added/removed from the router.) IP address
removed from the virtual router with the no form of the vrrp3 address command.

Configuring the VRRPv3 Advertisement Interval

The advertisement interval is configurable, but all virtual routers with the same VRID must be configured
with the same value. If the advertisement interval is set differently for a master router and a backup router,
VRRPv3 packets may be dropped because the newly configured interval does not match the interval indi-
cated in the packet. The backup router will then take over and send a neighbor advertisement
includes the virtual router IP address and the virtual router MAC address. In addition to creating duplicate
IP/MAC address messages, both routers will begin forwarding packets sent to the virtual router MAC
address. This will result in forwarding duplicate packets.
To avoid duplicate addresses and packets, make sure the advertisement interval is configured the same on
both the master and the backup router.
To configure the advertisement interval, use the
-> vrrp3 6 4 disable
-> vrrp3 6 4 interval 500
In this example, VRRPv3 virtual router 6 is disabled. (If you are modifying an existing virtual router, the
virtual router must be disabled before it may be modified.) The vrrp3 command is then used to set the
advertising interval for virtual router 6 to 500 centiseconds.

Configuring the VRRPv3 Virtual Router Priority

VRRPv3 functions with one master virtual router and at least one backup virtual router. A priority value
determines the role each router plays. It also decides the selection of backup routers for taking over as the
master router, if the master router is unavailable.
Priority values range from 1 to 254. A value of 255 indicates that the virtual router owns the IPv6 address;
that is, the router contains the real physical interface to which the IPv6 address is assigned. The default
priority value is 100; however the switch sets this value to 255 if it detects that this router is the IPv6
address owner. The value cannot be set to 255 if the router is not the IPv6 address owner.
The IPv6 address owner will always be the master router if it is available. If more than one backup router
is configured, their priority values should be configured with different values, so that the backup with the
higher value will take over for the master. The priority parameter may be used to control the order in
OmniSwitch AOS Release 6 Network Configuration Guide
fe80::200:5eff:fe00:20a
vrrp3 command with the interval keyword. For example:
September 2009
VRRPv3 Configuration Overview
. The virtual router is then enabled with
fe80::200:5eff:fe00:20a
is then
which
,
page 32-21