Concept Guide

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 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 the system 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.
Configuring a Virtual IP Address
To configure a virtual IP address, use the following commands.
1. Configure a VRRP group.
INTERFACE mode
vrrp-group vrrp-id
The VRID range is from 1 to 255.
2. Configure virtual IP addresses for this VRID.
INTERFACE -VRID mode
virtual-address ip-address1 [...ip-address12]
The range is up to 12 addresses.
The following example shows how to configure a virtual IP address.
Dell(conf-if-te-1/1/1-vrid-111)#virtual-address 10.10.10.1
Dell(conf-if-te-1/1/1-vrid-111)#virtual-address 10.10.10.2
Dell(conf-if-te-1/1/1-vrid-111)#virtual-address 10.10.10.3
The following example shows how to verify a virtual IP address configuration.
NOTE: In the following example, the primary IP address and the virtual IP addresses are on the same subnet.
Dell(conf-if-te-1/1/1)#show conf
!
interface TenGigabitEthernet 1/1/1
ip address 10.10.10.1/24
!
vrrp-group 111
priority 255
virtual-address 10.10.10.1
virtual-address 10.10.10.2
virtual-address 10.10.10.3
!
vrrp-group 222
no shutdown
The following example shows the same VRRP group (VRID 111) configured on multiple interfaces on different subnets.
Dell#show vrrp
------------------
TenGigabitEthernet 1/1/1, VRID: 111, Net: 10.10.10.1
State: Master, Priority: 255, Master: 10.10.10.1 (local)
Hold Down: 0 sec, Preempt: TRUE, AdvInt: 1 sec
Adv rcvd: 0, Bad pkts rcvd: 0, Adv sent: 1768, Gratuitous ARP sent: 5
Virtual MAC address:
00:00:5e:00:01:6f
Virtual IP address:
10.10.10.1 10.10.10.2 10.10.10.3 10.10.10.10
Authentication: (none)
------------------
Virtual Router Redundancy Protocol (VRRP)
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