Vrrp Vrid Preempt-Mode - HP 6125XLG Command Reference Manual

key: Sets the authentication key. This argument is case sensitive. It must be a ciphertext string of 1 to 41
characters if the cipher keyword is specified or a plaintext string of 1 to 8 characters if the plain keyword
is specified.
Usage guidelines
To avoid attacks from unauthorized users, VRRP member routers add authentication keys in VRRP packets
to authenticate one another. VRRP provides the following authentication modes:
• simple—Simple text authentication.
The sender fills an authentication key into the VRRP packet, and the receiver compares the received
authentication key with its local authentication key. If the two authentication keys are the same, the
received VRRP packet is legitimate. Otherwise, the received packet is illegitimate.
• md5—MD5 authentication.
The sender computes a digest for the packet to be sent by using the authentication key and MD5
algorithm, and it saves the result in the authentication header. The receiver performs the same
operation by using the authentication key and MD5 algorithm, and it compares the result with the
content in the authentication header. If the results are the same, the received VRRP packet is
legitimate. Otherwise, the received packet is illegitimate.
The MD5 authentication is more secure than the simple text authentication, but it costs more resources.
For security purposes, all keys, including keys configured in plain text, are saved in cipher text.
IMPORTANT:
You can configure different authentication modes and authentication keys for the VRRP groups on an
•
interface. However, members of the same VRRP group must use the same authentication mode and
authentication key.
For VRRPv3, this command does not take effect.
•
Examples
# Set the authentication mode to simple and the authentication key to Sysname for VRRP group 1 on
VLAN-interface 2.
<Sysname> system-view
[Sysname] interface vlan-interface 2
[Sysname-Vlan-interface2] vrrp vrid 1 authentication-mode simple plain Sysname
Related commands
• display vrrp
vrrp version
•

vrrp vrid preempt-mode

Use vrrp vrid preempt-mode to enable the preemptive mode for the device in an IPv4 VRRP group and
configure the preemption delay.
Use undo vrrp vrid preempt-mode to disable the preemptive mode for the device in an IPv4 VRRP group.
Use undo vrrp vrid preempt-mode delay to restore the default preemption delay.
Syntax
vrrp vrid virtual-router-id preempt-mode [ delay delay-value ]
74