Install Guide

Configuring the VRRP Version for an IPv4 Group
For IPv4, you can configure a VRRP group to use one of the following VRRP versions:
● VRRPv2 as defined in RFC 3768, Virtual Router Redundancy Protocol (VRRP)
● VRRPv3 as defined in RFC 5798, Virtual Router Redundancy Protocol (VRRP) Version 3 for IPv4 and IPv6
You can also migrate a IPv4 group from VRRPv2 to VRRP3.
To configure the VRRP version for IPv4, use the version command in INTERFACE mode.
Example: Configuring VRRP to Use Version 3
The following example configures the IPv4 VRRP 100 group to use VRRP protocol version 3.
You can use the version both command in INTERFACE mode to migrate from VRRPv2 to VRRPv3. When you set the VRRP
version to both, the switch sends only VRRPv3 advertisements but can receive VRRPv2 or VRRPv3 packets.
To migrate an IPv4 VRRP group from VRRPv2 to VRRPv3:
1. Set the switches with the lowest priority to “both”.
2. Set the switch with the highest priority to version to 3.
3. Set all the switches from both to version 3.
NOTE: Do not run VRRP version 2 and version 3 in the same group for an extended period of time
Example: Migrating an IPv4 VRRP Group from VRRPv2 to VRRPv3
NOTE: Carefully following this procedure, otherwise you might introduce dual master switches issues.
To migrate an IPv4 VRRP Group from VRRPv2 to VRRPv3:
1. Set the backup switches to VRRP version to both.
2. Set the master switch to VRRP protocol version 3.
3. Set the backup switches to version 3.
Assign Virtual IP addresses
Virtual routers contain virtual IP addresses configured for that VRRP group (VRID). A VRRP group does not transmit VRRP
packets until you assign the Virtual IP address to the VRRP group.
To activate a VRRP group on an interface (so that VRRP group starts transmitting VRRP packets), configure at least one virtual
IP address in a VRRP group. The virtual IP address is the IP address of the virtual router and does not require the IP address
mask.
You can configure up to 12 virtual IP addresses on a single VRRP group (VRID).
The following rules apply to virtual IP addresses:
● The virtual IP addresses must be in the same subnet as the primary or secondary IP addresses configured on the interface.
Though a single VRRP group can contain virtual IP addresses belonging to multiple IP subnets configured on the interface,
Dell EMC Networking recommends configuring virtual IP addresses belonging to the same IP subnet for any one VRRP
group.
○ For example, an interface (on which you enable VRRP) contains a primary IP address of 50.1.1.1/24 and a secondary IP
address of 60.1.1.1/24. The VRRP group (VRID 1) must contain virtual addresses belonging to either subnet 50.1.1.0/24 or
subnet 60.1.1.0/24, but not from both subnets (though Dell EMC Networking OS allows the same).
● If the virtual IP address and the interface’s primary/secondary IP address are the same, the priority on that VRRP group
MUST be set to 255. The interface then becomes the OWNER router of the VRRP group and the interface’s physical MAC
address is changed to that of the owner VRRP group’s MAC address.
● If you configure multiple VRRP groups on an interface, only one of the VRRP Groups can contain the interface primary or
secondary IP address.
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Virtual Router Redundancy Protocol (VRRP)