Extreme Networks ExtremeWare Command Reference Manual page 1060

ESRP Commands
• Down-Stuck —Port stays down and requires manual intervention.
If you have ELSM automatic restart enabled and the port goes down, ELSM automatically brings up
the port if it receives the Hello packets from its neighbor.
If you do not have automatic restart enabled, the port goes through the Up, Down, Down-Wait
process once. When you first enable ELSM or if you reboot the switch, it goes through the process
twice. After it is done with the cycle (or cycles), the port enters the Down-Stuck state.
To enable automatic restart, use the following command:
enable elsm auto-restart ports <portlist>
To disable automatic restart, use the following command:
disable elsm auto-restart ports <portlist>
To get out of the Down-Stuck state and enter the Down state, you can use one of the following
commands:
clear elsm auto-restart ports <portlist>
enable elsm auto-restart ports <portlist>
The ELSM transmit port sends hello messages to its peer. The ELSM transmit states are.
• Init—No ELSM activity, the initial transmit state. The port remains in this state until ELSM is
enabled on the port.
• HelloRx- —Transitions from Init when ELSM is enabled.
When you enable ELSM, the port transitions from the Init state to the HelloRx- state. During the
HelloRx- state, the port waits to receive neighbor hello messages. Depending on what happens to the
port, the following occurs:
— Hello+ packet received: The port actively receives hello messages from its neighbor and the
network is healthy. The port transitions to the Hello Rx+ state.
— Hello- packet received: The neighbor has not received the Hello packet sent by this switch. The
switch transitions to HelloRx+ state.
• HelloRx+ —Up and receives hello messages.
In this state, the port receives hello messages from its neighbor and the following occurs:
— Hello+ packet received: The port actively receives hello messages from its neighbor and the
network is healthy. The port remains in the Hello Rx+ state and the HelloRx timer is restarted.
— Hello- packet received: The neighbor has not received the Hello sent by this switch. The switch
stays in the HelloRx+ state.
— HelloRX timer: If the HelloRx timer expires, the port returns to the HelloRx- state.
• CriticalEvent—A critical event occurs in the software.
A critical event occurs when a critical task crash occurs in the software. When the critical event
clears, the port returns to the HelloRx- state. As long as the port is in the CriticalEvent state, Hello -
packets are sent to the neighboring device.
Example
The following command specifies that 2 packets are required to transition out of the Down-Wait receive
state to the Up receive state for ports 1-4 on the switch:
configure elsm hold-threshold 2 ports 1-4
1060 ExtremeWare Software 7.3.0 Command Reference Guide