Specifications

184 ExtremeWare XOS 11.0 Concepts Guide
Ethernet Automatic Protection Switching
The following command example identifies this switch as a transit node for the EAPS domain named
eaps_1.
configure eaps eaps_1 mode transit
Configuring EAPS Polling Timers
To set the values of the polling timers the master node uses for the EAPS health check packet that is
circulated around the ring for an EAPS domain, use the following commands:
configure eaps <name> hellotime <seconds>
configure eaps <name> failtime <seconds>
NOTE
These commands apply only to the master node. If you configure the polling timers for a transit node,
they will be ignored. If you later reconfigure that transit node as the master node, the polling timer
values will be used as the current values.
Use the hellotime keyword and its associated seconds parameter to specify the amount of time the
master node waits between transmissions of health check packets on the control VLAN. The value for
seconds must be greater than 0 when you are configuring a master node. The default value is 1 second.
NOTE
Increasing the hellotime value keeps the processor from sending and processing too many health
check packets. Increasing the
hellotime value should not affect the network convergence time because
transit nodes are already sending “link down” notifications.
Use the failtime keyword and seconds parameters to specify the amount of time the master node
waits before the failtimer expires.
The seconds parameter must be greater than the configured value for hellotime. The default value is 3
seconds.
To configure the action taken if there is a break in the ring, use the following command:
configure eaps <name> failtime expiry-action [ open-secondary-port | send-alert]
You can configure the action taken when the failtimer expires by using the configure eaps failtime
expiry-action
command. Use the send-alert parameter to send an alert when the failtimer expires.
Instead of going into a “failed” state, the master node remains in a “Complete” or “Init” state, maintains
the secondary port blocking, and writes a critical error message to syslog warning the user that there is
a fault in the ring. An SNMP trap is also sent.
Use the open-secondary-port parameter to open the secondary port when the failtimer expires.
NOTE
Increasing the failtime value provides more protection by waiting longer to receive a health check packet
when the network is congested.