Use this command to configure IS-IS authentication mode for this device.
| md5 | Specifies MD5 as the IS-IS authentication mode. |
| text | Specifies text as the IS-IS authentication mode. |
| level-1 | (Optional) Specifies that the authentication mode configuration should be restricted to level 1. |
| level-1-2 | (Optional) Specifies that the authentication mode configuration should be applied to both level 1 and level 2. |
| level-2 | (Optional) Specifies that the authentication mode configuration should be restricted to level 2. |
If no option is specified, the mode configuration is applied to both level 1 and level 2.
IS-IS router configuration.
The IS-IS MD5 mode authentication provides a cryptographic hash MD5 digest to each IS-IS PDU, preventing unauthorized routing messages to enter the IS-IS domain.
IS-IS has five packet types: link state packet (LSP), LAN Hello, Serial Hello, CSNP, and PSNP. The MD5 authentication or the clear text password authentication is applied to each IS-IS PDU type. The IS-IS level that the authentication is applied to can be specified for each level type.
The “no” form of this command removes the IS-IS authentication mode configuration.
This example shows how to configure the IS-IS authentication to MD5 for level 1:
System(rw)->configure System(rw-config)->router isis System(rw-config-isis)->authentication mode md5 level-1 System(rw-config-isis)->
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