Chapter 34. Virtual Router Redundancy Protocol; Vrrp Overview - Lenovo CN4093 Application Manual

Chapter 34. Virtual Router Redundancy Protocol

VRRP Overview

© Copyright Lenovo 2015
The CN4093 10Gb Converged Scalable Switch (CN4093) supports IPv4
high-availability network topologies through an enhanced implementation of the
Virtual Router Redundancy Protocol (VRRP).
Note: Lenovo N/OS 8.3 does not support IPv6 for VRRP.
The following topics are discussed in this chapter:
"VRRP Overview" on page

Lenovo N/OS redundancy configurations.
 "Failover Methods" on page
availability.
 "Lenovo N/OS Extensions to VRRP" on page
enhancements implemented in Lenovo N/OS.
 "Virtual Router Deployment Considerations" on page
describes issues to consider when deploying virtual routers.
 "High Availability Configurations" on page
useful and easily deployed redundant configurations.
"Active-Active Configuration" on page 511

"Hot-Standby Configuration" on page 515

In a high-availability network topology, no device can create a single
point-of-failure for the network or force a single point-of-failure to any other part
of the network. This means that your network will remain in service despite the
failure of any single device. To achieve this usually requires redundancy for all
vital network components.
VRRP enables redundant router configurations within a LAN, providing alternate
router paths for a host to eliminate single points-of-failure within a network. Each
participating VRRP-capable routing device is configured with the same virtual
router IPv4 address and ID number. One of the virtual routers is elected as the
master, based on a number of priority criteria, and assumes control of the shared
virtual router IPv4 address. If the master fails, one of the backup virtual routers
will take control of the virtual router IPv4 address and actively process traffic
addressed to it.
With VRRP, Virtual Interface Routers (VIR) allow two VRRP routers to share an IP
interface across the routers. VIRs provide a single Destination IPv4 (DIP) address
for upstream routers to reach various servers, and provide a virtual default
Gateway for the server blades.
503. This section discusses VRRP operation and
506. This section describes the three modes of high
509. This section describes VRRP
511. This section discusses the more
510. This section
503