Extreme Networks ExtremeWare XOS Command Reference Manual page 557

sticky > track > ports > priority
sticky > track > ports > priority >
mac
track > ports > priority
track > ports > priority > mac
Default
In extended mode, the default election algorithm is
.
weight
In standard mode, the default election algorithm is
Usage Guidelines
The election algorithm determines the order of precedence of the election factors used to determine the
ESRP Master. The election factors are:
• Stickiness (
domain claims master, its sticky value is set to 1 (available in extended mode only).
• Active Ports (
• Tracking Information (
has priority.
• ESRP Priority (
higher priority. The default priority setting is 0. A priority setting of 255 makes an ESRP switch
remain in slave mode and is the recommended setting for system maintenance. A switch with a
priority setting of 255 will never become the master.
• MAC address (
The election algorithm must be the same on all switches for a particular ESRP domain. The election
algorithms that use sticky are and weight are available in extended mode only.
Factors to Consider. The
ensure that there is no failback if the original Master recovers (the Master will have the same ports,
tracks and priority, but a higher MAC).
Any of the options with sticky can also be used to ensure that there is no failback if the original master
recovers. With sticky, if an event causes the ESRP master to failover, ESRP assigns the new master with
the sticky count of 1. After sticky is set on the master, regardless of changes to its neighbor's election
algorithm, the new master retains its position. For example, adding active ports to the slave does not
cause the new master to failback to the original master, even if the slave has more active ports than the
master. Sticky algorithms provide for fewer network interruptions than non-sticky algorithms. Sticky is
set on the master switch only.
ESRP re-election can occur if sticky is set on the master and a local event occurs. During this time, if the
current master has lower election parameters, the backup can become the new master.
ExtremeWare XOS 11.0 Command Reference Guide
Specifies that this ESRP domain should consider election factors in the
following order: Stickiness, tracking information, active ports, ESRP priority.
Specifies that this ESRP domain should consider election factors in the
following order: Stickiness, tracking information, active ports, ESRP priority,
MAC address.
Specifies that this ESRP domain should consider election factors in the
following order: Tracking information, active ports, ESRP priority.
Specifies that this ESRP domain should consider election factors in the
following order: Tracking information, active ports, ESRP priority, MAC
address.
): the switch with the higher sticky value has higher priority. When an ESRP
sticky
): the number of active ports (the switch with the highest number takes priority)
ports
): whether the switch is using ESRP tracking. A switch using tracking
track
): a user-defined priority number between 0 and 254. A higher number has
priority
): the switch MAC address. A higher-number address has priority.
mac
ports-track-priority
sticky > ports > track > priority > mac >
ports > track > priority > mac
or
track-ports-priority
configure esrp election-policy
.
options can be used to
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