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212777-A, February 2002
247
CHAPTER 11
High Availability
Alteon Web switches support high-availability network topologies through an enhanced imple-
mentation of the Virtual Router Redundancy Protocol (VRRP).
The following topics are discussed in this chapter:
n “VRRP Overview” on page 248. This section discusses VRRP operation and Web OS
redundancy configurations.
n “Failover Methods” on page 253. This section describes the three modes of high availabil-
ity.
n “Web OS Extensions to VRRP” on page 259. This section describes VRRP enhancements
implemented in Web OS.
n “High Availability Configurations” on page 263. This section discusses a few of the more
useful and easily deployed redundant configurations.
“Active-Standby Virtual Server Router Configuration” on page 263
“Active-Active VIR and VSR Configuration” on page 265
“Active/Active Server Load Balancing Configuration” on page 267
“VRRP-Based Hot-Standby Configuration” on page 275
n “Virtual Router Deployment Considerations” on page 277. This section describes issues to
consider when deploying virtual routers.
n “Stateful Failover of Layer 4 and Layer 7 Persistent Sessions” on page 283. This section
describes how to enable stateful failover by mirroring Layer 7 and Layer 4 persistent
transactional states on the peer switch.