Coyote Point Systems Equalizer Especificações descarregar pdf (Página 371)

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If a server does not respond to an ICMP echo request and no other probes are configured, the server is marked

"DOWN", and Equalizer continues to send ICMP requests to the server’s IP address. If an ICMP echo response is

subsequently received, the server is marked "UP".

Responding to ICMP echo requests is an option on most server platforms. If ICMP echo reply is disabled on one or

more of the servers your configuration, then you may want to disable ICMP echo requests on Equalizer to reduce

traffic between Equalizer and the servers, and rely solely on the other probing mechanisms.

Note - At least one ICMP probe of a server must have succeeded since the last Equalizer reboot, or failed ICMP probes

for the server will be ignored. This is done to avoid marking down a server that is configured to ignore ICMP Echo

Requests.

Enabling/Disabling Layer 3 ICMP Probes

Enable/Disable ICMP probes in the GUI

ICMP probes are enabled by default for all servers.

1. Click on a Servers on the left navigational pane and select a configured server.

2. In the right configuration pane, enable (or disable) the Probe Layer 3 check box.

3. Click Commit.

Enable/Disable ICMP Probes in the CLI

ICMP probes are enabled by default for all servers.

1. To enable ICMP probes for a server in the CLI enter the following:

eqcli > server svname flags probe_l3

2. To disable ICMP probes for a server in the CLI:

eqcli > server svname flags !probe_l3

Configuring Layer 3 ICMP Probe Parameters

ICMP server probes are configured using the global parameters described in the table below. Each server is sent

ICMP ECHO Request packets by Equalizer and is marked up or down depending upon whether the server

responds or not.

The number of times a server is probed is determined by the ICMP Maximum Tries parameter. The ICMP Interval

parameter is a timer. When the ICMP Interval timer starts, the first ICMP probe is sent. If the value of ICMP

Maximum Tries is greater than 1, the next probe is sent a number of seconds later equal to:

(ICMP Interval) / (ICMP Maximum Tries)

For example, the default ICMP Interval is "15" and the default ICMP Maximum Tries is "3". So, by default, an

ICMP probe is sent to each server every 5 seconds.

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