Displaying ELSM Information

Display summary information for all of the ELSM-enabled ports on the switch with the command:
show elsm
This command displays in a tabular format the operational state of ELSM on the configured ports.

If ports are configured for ELSM (ELSM is enabled), the switch displays the following information:
- Port—The port number of the ELSM-enabled port.
- ELSM State—The current state of ELSM on the port. For information about the port states, see ELSM Port States.
- Hello time—The current value of the hello timer, which by default is 1 second. For information about configuring the hello timer, see Configuring the ELSM Hello Timer.
If no ports are configured for ELSM (ELSM is disabled), the switch does not display any information.
Display detailed information for one or more ELSM-enabled ports on the switch.
show elsm ports all | port_list
In addition to the port, ELSM state, and hello timer information, this command displays in a tabular format the following:
- Link State—The state of the link between ELSM-enabled ports. For information about the link states, see Link States.
- ELSM Link State—The current state of the ELSM logical link on the switch. For more information, see ELSM Link States.
- Hello Transmit State—The current state of ELSM hello messages being transmitted.
- Hold Threshold—The number of Hello+ messages required by the ELSM-enabled port to transition from the Down-Wait state to the Up state within the hold threshold.
- UpTimer Threshold—The number of hello times that span without receiving Hello+ packets before a port changes its ELSM state from Up to Down.
- Auto Restart—The current state of ELSM automatic restart on the port.
- Sticky Threshold—The number of times a port can transition between the Up and Down states. The sticky threshold is not user-configurable and has a default value of 1.
- Sticky Threshold Counter—The number of times the port transitions from the Up state to the Down state.
- Down Timeout—The actual waiting time (msecs or secs) before a port changes its ELSM state from Down to Up after receiving the first Hello+ packet. It is equal to [Hello Time * (Hold Threshold+2)].
- Up Timeout—The actual waiting time (msecs or secs) before a port changes its ELSM state from Up to Down after receiving the last Hello+ packets. It is equal to [Hello Time * UpTimer Threshold].
The remaining output displays counter information.
Use the counter information to determine the health of the ELSM peers and how often ELSM has gone up or down.
The counters are cumulative.
- Rx Hello+—The number of Hello+ messages received by the port.
- Rx Hello- —The number of Hello- messages received by the port.
- Tx Hello+—The number of Hello+ messages sent by the port.
- Tx Hello- —The number of Hello- messages sent by the port.
- ELSM Up/Down Count—The number of times ELSM has been up or down.
Display summary port information in a tabular format for one or more ELSM-enabled ports with the command:
show ports {port_list} information {detail}
This command displays the following ELSM information:
- Flags
  - L—ELSM is enabled on the switch
  - - —ELSM is disabled on the switch
- ELSM (For more information, see ELSM Link States.)
  - up—ELSM is enabled and the ELSM link state is up.
  - dn—ELSM is enabled and the ELSM link state is down.
  - - —ELSM is disabled on the switch.
Display summary port information called out in written explanations versus displayed in a tabular format, use the detail parameter.
show ports {port_list} information {detail}
This command displays the following ELSM information:
- ELSM Link State (displayed only if ELSM is enabled on the switch). For more information, see ELSM Link States.
  - Up—ELSM is enabled and the ELSM link state is up.
  - Down—ELSM is enabled and the ELSM link state is down.
- Link State—The state of the link between ELSM-enabled ports. For information about the link states, see Link States.
- ELSM
  - Enabled—ELSM is enabled on the switch.
  - Disabled—ELSM is disabled on the switch.