Users Guide

VRRP:
● Provides a virtual default routing platform
● Provides load balancing
● Supports multiple logical IP subnets on a single LAN segment
● Enables simple traffic routing without the single point of failure of a static default route
● Avoids issues with dynamic routing and discovery protocols
● Takes over a failed default router:
○ Within a few seconds
○ With a minimum of VRRP traffic
○ Without any interaction from hosts
NOTE:
● The default behavior of VRRP is active-active. If you do not want the VRRP backup gateway to forward traffic on behalf
of the active VRRP gateway in a non-VLT deployment, use the no vrrp mode active-active command to disable
the VRRP active-active feature.
● In a VLT deployment, OS10 supports VRRP in an active-standby mode as well. However, it is recommended that you use
the default VRRP active-active mode in a VLT deployment.
NOTE: When an IPv6 VRRP group and OSPFv3 are configured on the same interface, OSPFv3 does not converge on
that interface. For OSPFv3 convergence to happen on that interface, configure a static IPv6 neighbor entry on the VLAN
interface with the peer link-local IPv6 address and MAC address. To configure a static IPv6 neighbor entry with the peer
link-local IPv6 address and MAC address, use the ipv6 neighbor command.
VRRP provides interoperability for VRRPv3 IPv4 groups between OS10 and any other VRRP solutions that do not include a
pseudo header in the VRRP checksum calculation. The OS10 VRRP solution automatically detects whether a pseudo header is
used or not, and adjusts the checksum algorithm to match the peer. This allows full interoperability with any other router or
switch that uses the checksum approach.
NOTE: VRRP works only when all the other VRRP peers in the VRRP group are using the same checksum algorithm.
Configuration notes
All Dell EMC PowerSwitches except MX-Series, S4200-Series, S5200 Series, and Z9332F-ON:
Priority 255 is not supported.
Configuration
VRRP specifies a master, or active, router that owns the next-hop IP and MAC address for end stations on a LAN. The master
router is chosen from the virtual routers by an election process and forwards packets sent to the next-hop IP address. If the
master router fails, VRRP begins the election process to choose a new master router which continues routing traffic.
VRRP packets transmit with the virtual router MAC address as the source MAC address. The virtual router MAC address
associated with a virtual router is in 00:00:5E:00:01:{VRID} format for IPv4 and 00:00:5E:00:02:{VRID} format for IPv6. The
VRID is the virtual router identifier that allows up to 255 IPv4 and IPv6 VRRP routers on a network. The first four octets are
unquenchable, the last two octets are 01:{VRID} for IPv4 and 02:{VRID} for IPv6. The final octet changes depending on the
VRRP virtual router identifier.
Basic VRRP Configuration
Layer 3
1011