Cisco Nexus 3548

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Cisco Nexus 3548 Switch NX-OS Unicast Routing Command Reference
OL-27852-01
Chapter Unicast Routing Commands
authentication (HSRP)
authentication (HSRP)
To configure authentication for the Hot Standby Router Protocol (HSRP), use the authentication
command. To disable authentication, use the no form of this command.
authentication {string | md5 {key-chain key-chain | key-string {0 | 7} text [timeout seconds]} |
text string}
no authentication {string | md5 {key-chain key-chain | key-string {0 | 7} text [timeout seconds]}
| text string}
Syntax Description
Command Default Disabled
Command Modes HSRP configuration or HSRP template mode
Command History
Usage Guidelines Use the authentication text command to prevent misconfigured routers from participating in HSRP
groups that they are not intended to participate in. The authentication string is sent unencrypted in all
HSRP messages. The same authentication string must be configured on all routers in the same group to
ensure interoperation. HSRP protocol packets that do not authenticate are ignored.
Caution If you configure two routers with identical HSRP IP addresses but with different authentication strings,
then neither router is aware of the duplication.
This command does not require a license.
md5 Specifies the Message Digest 5 (MD5) authentication.
key-chain key-chain Identifies a group of authentication keys.
key-string Specifies the secret key for MD5 authentication.
0 Specifies a clear text string.
7 Specifies an encrypted string.
text Secret key for MD5 authentication. The range is from 1 to 255 characters.
We recommend that you use at least 16 characters.
timeout seconds (Optional) Specifies the authentication timeout value. The range is from 0
to 32767.
text string Specifies an authentication string. The range is from 1 to 255 characters. The
default string is “cisco”.
Release Modification
5.0(3)A1(1) This command was introduced.