Esrp Failover Time; Esrp Election Algorithms - Extreme Networks ExtremeWare XOS Guide Manual

Extreme Standby Router Protocol
CAUTION
Configure the pre-master state timeout only with guidance from Extreme Networks personnel. Misconfiguration can
severely degrade the performance of ESRP and your switch.

ESRP Failover Time

ESRP Failover time is largely determined by the following factors:
ESRP hello timer setting.
●
ESRP neighbor timer setting.
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The routing protocol being used for interrouter connectivity if Layer 3 redundancy is used; OSPF
●
failover time is faster than RIP failover time.
The failover time associated with the ESRP protocol depends on the timer setting and the nature of the
failure. The default hello timer setting is 2 seconds; the range is 2 to 1024 seconds. The default neighbor
timer setting is 8 seconds; the range is 3*hello to 1024 seconds. The failover time depends on the type of
event that caused ESRP to failover. In most cases, a non-hardware failover is less than 1 second, and a
hardware failover is 8 seconds.
If routing is configured, the failover of the particular routing protocol (such as RIP V1, RIP V2, or OSPF)
is added to the failover time associated with ESRP.
If you use OSPF, make your OSPF configuration passive. A passive configuration acts as a stub area and
helps increase the time it takes for recalculating the network. A passive configuration also maintains a
stable OSPF core.
For more information about the ESRP timers and configuring the ESRP timers, see the ExtremeWare XOS
Command Reference Guide.

ESRP Election Algorithms

You configure the switch to use one of 16 different election algorithms to select the ESRP master. ESRP
uses the default election policy for extended mode. If you have an ESRP domain operating in standard
mode, the domain ignores the sticky and weight algorithms.
To change the election algorithm, you must first disable the ESRP domain and then configure the new
election algorithm. If you attempt to change the election algorithm without disabling the domain first,
an error message appears.
To disable the ESRP domain, use the following command:
disable esrp {<esrpDomain>}
To modify the election algorithm, use the following command:
configure esrp <esrpDomain> election-policy [ports > track > priority | ports > track
> priority > mac | priority > mac | priority > ports > track > mac | priority > track
> ports > mac | sticky > ports > track > priority | sticky > ports > track > priority
> mac | sticky > ports > weight > track > priority > mac | sticky > priority > mac |
sticky > priority > ports > track > mac | sticky > priority > track > ports > mac |
sticky > track > ports > priority > | track > ports > priority | track > ports >
priority > mac >]
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