Working with SNMP Traps

Using SNMP

 

 

 

 

Authentication Trap

The authentication trap is sent when an SNMP authentication failure is detected. This trap is a signal to the management station that the switch received a message from an unauthorized protocol entity. This normally means that a network entity attempted an operation on the switch for which it had insufficient authorization. When the SNMP authentication trap is enabled, the switch will forward a trap to the management station. The following command will enable the authentication trap:

-> snmp authentication trap enable

The trap will be suppressed if the SNMP authentication trap is disabled.

Trap Management

Several CLI commands allow you to control trap forwarding from the agent in the switch to the SNMP management station.

Replaying Traps

The switch normally stores all traps that have been sent out to the SNMP management stations. You can list the last stored traps by using the show snmp trap replay command. This command lists the traps along with their sequence number. The sequence number is a record of the order in which the traps were previously sent out.

You may want to replay traps that have been stored on the switch for testing or troubleshooting purposes. This is useful in the event that any traps are lost in the network. To replay stored traps, use the snmp trap replay command followed by the IP address for an SNMP management station. This command replays (or re-sends) all stored traps from the switch to the specified management station on demand.

If you do not want to replay all of the stored traps, you can specify the sequence number from which the trap replay will start. The switch will start the replay with a trap sequence number greater than or equal to the sequence number given in the CLI command. The number of traps replayed depends on the number of traps stored for this station.

Absorbing Traps

The switch may send the same traps to the management station many, many times. You can suppress the transmission of identical repetitive traps by issuing the snmp trap absorption command. When trap absorption is enabled, traps that are identical to traps previously sent will be suppressed and therefore not forwarded to the SNMP management station. The following command will enable SNMP trap absorption.

-> snmp trap absorption enable

To view or verify the status of the Trap Absorption service, use the show snmp trap config command.

Sending Traps to WebView

When WebView forwarding is enabled, all traps sent by switch applications are also forwarded to WebView. The following command allows a WebView session to retrieve the trap history log.

-> snmp trap to webview enable

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Alcatel Carrier Internetworking Solutions omniswitch manual Authentication Trap, Trap Management, Replaying Traps
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omniswitch specifications

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