Users Guide

Switch Management Commands 2268
• default — The engineID is created automatically, based on the device
MAC address.
Default Configuration
The engineID is generated using the switch MAC address.
Command Mode
Global Configuration mode
User Guidelines
If you want to use SNMPv3, an engine ID is required for the switch. You can
specify your own ID or use the default string that is generated using the MAC
address of the device. If the SNMPv3 engine ID is changed, or the
configuration file is erased, then SNMPv3 cannot be used until the SNMPv3
users are reconfigured. Since the EngineID must be unique within an
administrative domain, the following guidelines are recommended:
1 For standalone devices use the default keyword to configure the Engine
ID.
2 For stackable systems, configure your own EngineID, and verify that is
unique within your administrative domain.
Changing the value of the snmpEngineID has important side-effects. A user's
password (entered on the command line) is converted to an MD5 or SHA
security digest. This digest is based on both the password and the local engine
ID. The command line password is then deleted and is not stored on the
switch, as required by RFC 2274. Because of this deletion, if the local value of
engineID changes, the security digests of SNMPv3 users will be invalid and
the users will have to be reconfigured.
Example
The following example configures the Engine ID automatically.
console(config)# snmp-server engineID local default