VRRP Guidelines

In the ExtremeXOS User Guide, under VRRP chapter > VRRP Guidelines.

xos0056279, xos0062263

The VRRP guidelines should change to the following:

“The following guidelines apply to using VRRP:

• The maximum number of supported VRIDs per interface is seven.
• An interconnect link between VRRP routers should not be used, except when VRRP routers have hosts directly attached.
• A maximum of 128 VRID instances are supported on the router. This number can be extended up to 256 based on the license and hardware; refer to the release notes for the maximum limit.
• Up to seven unique VRIDs can be configured on the router. VRIDs can be re-used, but not on the same interface. When VRRP is configured for both IPv4 and IPv6, two unique VRIDs are consumed, though the same VRID is specified during VRRP instance creation. In other words, VRIDs used for each data protocol are counted separately.
• VRRP and other L2 redundancy protocols can be simultaneously enabled on the same switch.
• We do not recommend simultaneously enabling VRRP and ESRP on the same switch.
• When VRRP and BOOTP/DHCP relay are both enabled on the switch, the relayed BOOTP agent IP address is the actual switch IP address, not the virtual IP address. VRRP and ESRP cannot be configured on the same VLAN or port. This configuration is not allowed.
• RFC 5798 describes a situation where a master VRRP router takes on a duplicate IP address due to interaction with the duplicate address detection (DAD) feature. To prevent such duplicate addresses, the DAD feature is disabled whenever a VRRP router is configured for IPv6 or IPv4.
• A VRRP router instance can be configured with multiple IP addresses on the same subnet or on different subnets, provided that all virtual IP addresses match the subnet address of a VLAN on the switch. For example, if a host switch has VLAN IP addresses in the 1.1.1.x and 2.2.2.x subnets, then that VRRP router instance can contain virtual IP addresses in both those subnets as well. If a VRRP router instance is assigned priority 255, then the host router must own all the IP addresses assigned to the VRRP router instance. That is, each virtual IP address must match an IP address configured for a VLAN on the router.
• When a VRRPv2 instance spans routers using ExtremeXOS version 12.6 and earlier and routers using ExtremeXOS version 12.7 and later, routers using ExtremeXOS version 12.6 and earlier log packet-size warning messages.
• VRRP scaling numbers differs based on the license and hardware used; please refer the release notes for individual scaling limits.
• The maximum number of VIPs supported for a single VRRP instance is 255."