Extreme Networks ExtremeWare XOS 11.0, Справочник по командам

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configure esrp election-policy
ExtremeWare XOS 11.0 Command Reference Guide 557
Default
In extended mode, the default election algorithm is
sticky > ports > track > priority > mac >
weight
.
In standard mode, the default election algorithm is
ports > track > priority > mac
.
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 (
sticky
): the switch with the higher sticky value has higher priority. When an ESRP
domain claims master, its sticky value is set to 1 (available in extended mode only).
• Active Ports (
ports
): the number of active ports (the switch with the highest number takes priority)
• Tracking Information (
track
): whether the switch is using ESRP tracking. A switch using tracking
has priority.
• ESRP Priority (
priority
): a user-defined priority number between 0 and 254. A higher number has
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 (
mac
): the switch MAC address. A higher-number address has priority.
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
ports-track-priority
or
track-ports-priority
options can be used to
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.
sticky > track > ports > priority Specifies that this ESRP domain should consider election factors in the
following order: Stickiness, tracking information, active ports, ESRP priority.
sticky > track > ports > priority >
mac Specifies that this ESRP domain should consider election factors in the
following order: Stickiness, tracking information, active ports, ESRP priority,
MAC address.
track > ports > priority Specifies that this ESRP domain should consider election factors in the
following order: Tracking information, active ports, ESRP priority.
track > ports > priority > mac Specifies that this ESRP domain should consider election factors in the
following order: Tracking information, active ports, ESRP priority, MAC
address.