Extreme Networks ExtremeWare 7.7 Command Reference Manual Download

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ExtremeWare 7.7 Command Reference Guide

ESRP Commands

ELSM uses two types of hello packets to communicate the health of the network to other ELSM ports.

•

Hello+ — The device receives a hello from the neighbor device, and no problem is detected

•

Hello- — The device does not receive a hello from the neighbor device, or the device has
experienced a critical event.

Use the following command to specify the time, in seconds, between consecutive ELSM hellos:

configure elsm hellotime <1-128> ports <portlist>

Table 28 describes the ELSM timers that are derived from other timers and are not user-configurable.

The ELSM receive port receives hello messages from its peer. The ELSM receive states are:

•

Down—Port is down.

When you enable ELSM, the starting state is Up. If it does not receive a Hello message from its
neighbor before the Up timeout, it transitions to the Down state. When ELSM is down, data packets
are neither received nor transmitted out of that port.

•

Down-Wait—Transitional state.

When the port enters the Down-Wait state, the Down timer begins. After the timer expires, the port
checks the number of Hello+ packets received against the configured down threshold. If the Hello+
packets are greater than or equal to the threshold, the port transitions to the Up state. If the Hello+
packets are less than the threshold, the port returns to the Down state and begins the process again.

•

Up—Beginning state, port is up.

If ELSM is enabled and the port enters the Up state, the Up timer begins. Each time the port receives
a Hello+ packet, the timer restarts and remains in the Up state.

If the port no longer receives hello packets for Up-timer seconds, or receives a hello- packet, the port
transitions to either the Down or Down-Stuck state.

Table 28: Derived timers

Timer

Description

Down

Specifies the time it takes for the ELSM receive port to cycle through the following states:

•

Down

•

Down-Wait

•

If the Hello timer is set to 1 seconds, it takes 4 seconds for the ELSM receive port to cycle through
the states.

After the timer expires, the port checks the number of Hello+ packets against the hold threshold. If
the number of Hello+ packets received is greater than or equal to the configured hold threshold, the
ELSM receive port moves from the Down-Wait state to the Up state.

If the number of Hello(+) packets received is less than the configured hold threshold, the ELSM
receive port moves from the Down-Wait state to the Down state.

The down timer is 4 times the Hello timer.

When an ELSM-enabled port enters the Up state, the Up timer begins. The timer restarts each time
the port receives a Hello+ packet. The Up timer is 6 times the Hello timer.

HelloRx

Specifies the time in which a Hello packet is expected, otherwise the ELSM transmit state changes
from to HelloRx-. The HelloRx timer is 6 times the Hello timer.

Extreme Networks ExtremeWare 7.7, Command Reference Manual

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