Extreme Networks ExtremeWare 7.7, Command Reference Manual

Page: 1550 / 2620

1550 ExtremeWare 7.7 Command Reference Guide
ESRP Commands
configure vlan esrp timer
configure vlan <vlan name> esrp timer <timervalue> {esrp-nbr-timeout
<timeoutvalue>}
Description
Configures the ESRP timer values.
Syntax Description
Default
The default
timervalue
is 2 seconds.
The default neighbor timeout is 3 times the
timervalue
.
Usage Guidelines
The timer specifies the interval, in seconds, for exchanging keep-alive packets between the ESRP
switches for this VLAN. A lower value specifies a more frequent exchange of keep-alive messages,
resulting in the faster detection of a failover condition. The timer setting must be configured identically
for the VLAN across all participating switches. If your configuration contains more than 2,500 ESRP
VLANs and 256,000 FDB entries, we recommend a timer setting greater than 3 seconds.
The neighbor timeout specifies the amount of time that ESRP waits before considering the neighbor
down. The timeout value must be at least 3 times, but not more than 30 times the timervalue. Entering a
value outside of that range generates an error message.
In a large ESRP configuration, the slave ESRP VLAN might inadvertently become the master ESRP
VLAN. This can occur when FDB entries are flushed during a master-slave transition. To avoid this we
recommend the general neighbor timeout guidelines listed in Table 29.
Example
The following command configures the ESRP timer to 3 seconds and the ESRP neighbor timeout to 12
seconds:
configure vlan esrp-1 esrp timer 3 esrp-nbr-timeout 12
vlan name Specifies a VLAN name.
timervalue Specifies the number of seconds between keep-alive packets. The range is 1
to 255 seconds.
esrp-nbr-timeout Specifies the number of seconds after which an ESRP neighbor times out.
The range is 3 to 7650 seconds.
Table 29: General neighbor timeout
Number of Domains Number of VLANs Number of Active ports Suggested Neighbor Timeout
64 1000 6 or more > 8
48 or more 1500 4 or more > 10
48 or more 2000 4 or more > 11