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The Virtual Router Redundancy Protocol
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m .
Priority Preemption
You can enable a higher priority backup virtual router to preempt the lower priority master virtual router.
If the virtual IP address is also the IP address for the interface, then preemption is implicitly applied.
Note
The VRRP preemption is not supported on IP storage Gigabit Ethernet interfaces.
Note
To enable or disable preempting, follow these steps:
Command
Step 1
switch# config t
Step 2
switch(config)# interface vsan 1
switch(config-if)#
Step 3
switch(config-if)# vrrp 250
switch(config-if-vrrp)#
Step 4
switch(config-if-vrrp)# preempt
switch(config-if-vrrp)# no preempt
Virtual Router Authentication
VRRP security provides three options, including simple text authentication, MD5 authentication, and no
authentication.
•
•
•
You can configure the key using the authentication option in the VRRP submode and distribute it using
the configuration file. The security parameter index (SPI) settings assigned in this option should be
unique for each VSAN.
Note
All VRRP configurations must be duplicated.
Cisco MDS 9000 Family Configuration Guide
36-20
Simple text authentication uses a unique, 1 to 8 character password that is used by all switches
participating in the same virtual router. This password should be different from other security
passwords.
MD5 authentication uses a unique, 16 character key that is shared by all switches participating in
the same virtual router. This secret key is shared by all switches in the same virtual router.
No authentication is the default option.
Purpose
Enters configuration mode.
Configures a VSAN interface (VSAN 1).
Creates a virtual router.
Enables the higher priority backup virtual router to preempt
the lower priority master virtual router.
This preemption does not apply to the primary IP
Note
address.
Disables (default) the preempt option and allows the master
to keep its priority level.
OL-6973-03, Cisco MDS SAN-OS Release 2.x
Chapter 36
Configuring IP Services
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