Virtual Service Redundancy Protocol (VSRP) Overview
This section describes the commands for
configuring the Virtual Services Redundancy Protocol (VSRP) on a Sun Secure
Application Switch. VSRP is a protocol that provides redundancy support for
Layer 4 through 7 services. When you configure VSRP on the Sun Secure
Application Switch, two systems can exchange state and health information
about each other and their redundant vSwitches. An election occurs, and one
switch becomes the master system. If the master system has a failure,
failover can occur and service traffic switches to the backup, or peer node.
For additional information about configuring VSRP and how it works with the
Virtual Router Redundancy Protocol (VRRP), see the Sun Secure Application Switch - Configuration and Implementation Guide for v3.0 .
VSRP elections
VSRP uses an election preference to
determine which node should be the master node. The node with the higher
election preference becomes the master node. If the local node and the peer
node have the same election preference value, VSRP uses the node identifier
as a tie breaker. In this situation, the node with the higher node
identifier becomes the master system. If the master node is no longer
available, VSRP elects a new master from one of the configured VSRP peers.
VSRP sessions
At startup, a VSRP node tries to
connect to its peer. Once they establish this session, the nodes exchange
messages about their state and the services registered with VSRP. You can
configure multiple VSRP sessions for redundancy purposes, so failure of a
single VSRP session does not result in service failover.