configure elsm ports hellotime

configure elsm ports port_list hellotime hello_time


Configures the ELSM hello timer by specifying the time between consecutive hello messages for the specified ports.

Syntax Description

port_list Specifies the port or ports for which the ELSM hello timer should be configured.
hello_time Specifies the time in seconds between consecutive hello messages. Use the same value for the hello interval on peer ports. The default value is 1 second, and the range is 1 to 128 seconds.


The default is 1 second.

Usage Guidelines

ELSM works between two connected ports, and each ELSM instance is based on a single port.

When you enable ELSM on the specified ports, the ports participate in ELSM with their peers and begin exchanging ELSM hello messages.

ELSM uses two types of hello messages to communicate the health of the network to other ELSM ports:
  • Hello+ — The ELSM-enabled port receives a hello message from its peer and no problem is detected.

  • Hello- — The ELSM-enabled port does not receive a hello message from its peer.

ELSM also has hello transmit states. The hello transmit states display the current state of transmitted ELSM hello messages. For more information about the hello transmit states, see the show elsm ports command.

A high hello timer value can increase the time it takes for the ELSM-enabled port to enter the Up state. The down timer is (2 + hold threshold) * hello timer. Assuming the default value of 2 for the hold threshold, configuring a hello timer of 128 seconds creates a down timer of (2 + 2) 128, or 512 seconds. In this scenario it would take 512 seconds for the port to transition from the Down to the Up state.

If you modify the hello timer on one port, we recommend that you use the same hello timer value on its peer port.


The following command specifies 5 seconds between consecutive ELSM hello messages for slot 2, ports 1-2 on the switch:
configure elsm ports 2:1-2:2 hellotime 5


This command was first available in ExtremeXOS 11.4.

Platform Availability

This command is available on the Summit X450-G2, X460-G2, X670-G2, X770, and ExtremeSwitching X440-G2, X620, X690, X870 series switches.