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42C4911, January 2007 217
CHAPTER 13
High Availability
GbE Switch Modules support high-availability network topologies through an enhanced
implementation of the Virtual Router Redundancy Protocol (VRRP).
The following topics are discussed in this chapter:
“Layer 2 Failover” on page 218. This section discusses trunk failover without using
VRRP.
“VRRP Overview” on page 224. This section discusses VRRP operation and Alteon OS
redundancy configurations.
“Failover Methods” on page 227. This section describes the three modes of high availabil-
ity.
“Alteon OS extensions to VRRP” on page 230. This section describes VRRP enhance-
ments implemented in Alteon OS.
“Virtual Router Deployment Considerations” on page 231. This section describes issues to
consider when deploying virtual routers.
“High Availability Configurations” on page 233. This section discusses the more useful
and easily deployed redundant configurations.
“Active-Active Configuration” on page 233
“Hot-Standby Configuration” on page 238