Alcatel Carrier Internetworking Solutions 6800 User Manual
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.
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.
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.
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.