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C
HAPTER
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
redundancy configurations.
n
"Failover Methods" on page
ity.
n
"Web OS Extensions to VRRP" on page
implemented in Web OS.
n
"High Availability Configurations" on page
useful and easily deployed redundant configurations.
o
o
o
o
n
"Virtual Router Deployment Considerations" on page
consider when deploying virtual routers.
n
"Stateful Failover of Layer 4 and Layer 7 Persistent Sessions" on page
describes how to enable stateful failover by mirroring Layer 7 and Layer 4 persistent
transactional states on the peer switch.
212777-A, February 2002
11
"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
248. This section discusses VRRP operation and Web OS
253. This section describes the three modes of high availabil-
259. This section describes VRRP enhancements
263. This section discusses a few of the more
277. This section describes issues to
283. This section
247
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