HP 3500YL - Manual (Page 347)

Virtual Router Redundancy Protocol (VRRP)
Steps for Provisioning VRRP Operation
Associating More Than One Virtual IP Address
With a VR
This need arises if a VLAN is configured with more than 32 subnets and it is
necessary to apply VRRP to all of these subnets.
Because a VLAN on the routers covered by this Guide supports up to 32 VRs,
applying VRRP to a higher number of subnets in the VLAN requires multiple
virtual IP addresses in one or more VRs.
If the Owner of a VR is associated with multiple virtual IP addresses, then the
Backup router(s) belonging to the same VR must also be associated with the
same set of virtual IP addresses. If the virtual IP addresses on the Owner are
not also on the Backup(s), a misconfiguration exists. VRRP advertisement
packets sent by the VR Master will be dropped by the VR Backup(s) on account
of a mismatch among virtual IP addresses.
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