ELSM Link States

The state of the ELSM logical link is known as the ELSM link state. The ELSM link state can be one of the following:

View the current state of ELSM on the switch using the commands:

show elsm ports all | port_list

show ports {port_list} information {detail}

If you use the show elsm commands, the following terms display the ELSM link state:

Up—Indicates that ELSM is enabled and the ELSM peer ports are up and communicating; the ELSM link state is up. In the up state, the ELSM-enabled port sends and receives hello messages from its peer.
Down—Indicates that ELSM is enabled, but the ELSM peers are not communicating; the ELSM link state is down. In the down state, ELSM transitions the peer port on this device to the down state. ELSM blocks all incoming and outgoing switching traffic and all control traffic except ELSM PDUs.

If ELSM is disabled, the switch does not display any information.

If you use the show ports {port_list} information {detail} command, the following columns display the current state of ELSM on the switch:

Flags
- L—Indicates that ELSM is enabled on the switch
- - —Indicates that ELSM is disabled on the switch

ELSM
- up—Indicates that ELSM is enabled and the ELSM peer ports are up and communicating; the ELSM link state is up. In the up state, the ELSM-enabled port sends and receives hello messages from its peer.
- dn—Indicates that ELSM is enabled, but the ELSM peers are not communicating; the ELSM link state is down. In the down state, ELSM transitions the peer port on this device to the down state. ELSM blocks all incoming and outgoing switching traffic and all control traffic except ELSM PDUs.
- - —Indicates that ELSM is disabled on the switch.

If you specify the optional detail parameter, the following ELSM output is called out in written explanations versus displayed in a tabular format:

ELSM Link State (displayed only if ELSM is enabled on the switch)
- Up—Indicates that ELSM is enabled and the ELSM peer ports are up and communicating; the ELSM link state is up. In the up state, the ELSM-enabled port sends and receives hello messages from its peer.
- Down—Indicates that ELSM is enabled, but the ELSM peers are not communicating; the ELSM link state is down. In the down state, ELSM transitions the peer port on this device to the down state. ELSM blocks all incoming and outgoing switching traffic and all control traffic except ELSM PDUs.

ELSM
- Enabled—Indicates that ELSM is enabled on the switch
- Disabled—Indicates that ELSM is disabled on the switch

For more information about these show commands, see Displaying ELSM Information.

Published March 2020prev | next