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Dell EMC SmartFabric OS10 User Guide Release 10.5.2

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Virtual Router Redundancy Protocol

VRRP allows you to form virtual routers from groups of physical routers on your local area network (LAN). These virtual routing platforms—master and backup pairs—provide redundancy during hardware failure. VRRP also allows you to easily configure a virtual router as the default gateway to all your hosts. It also avoids the single point of failure of a physical router.

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.

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