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Troubleshooting Virtual Router Redundancy Protocol (VRRP) Protocol Information
OmniSwitch Troubleshooting Guide September 2005 page 13-3
Protocol Information
This next section describes how VRRP routers exchange information.
IP Field Descriptions
Source Address The primary address of the interface the packet is being sent from.
Destination Address The IP Multicast address 224.0.0.18
TTL Must be 255 or packet is dropped.
Protocol 112 decimal.
VRRP Field Descriptions
Version Specifies the VRRP version of the packet. Currently this is version 2.
Type There is only one type. 1-Advertisement. A packet set to anything other
than 1 is discarded.
VRID The virtual Router Identifier.
Priority Priority field can be 1-255 decimal. Higher Priorities have preference.
255 is always used by a VRRP router that uses the Virtual IP address as
a real address on an interface. Default is 100.
Count IP Address The number of IP addresses in this advertisement.
Authentication Type Indicates the method of authentication. As mentioned before, there are 3
types: No Authentication, Simple Text Password, IP authentications.
VRRP States
There are only 3 states that a VRRP Router can be in. They are initialize, Master, and Back-up.