Vrrp Configurations - 3Com 3C13636 Configuration Manual

3Com Router 3000 Ethernet Family
Configuration Guide
10.100.10.2 10.100.10.2
Router A Router A
Master Master
10.100.10.1 10.100.10.1
Figure 3-2 Virtual router
This virtual router has its own IP address: 10.100.10.1 (it can be the interface address
on a router in the standby group). The routers in the standby group also have their own
IP addresses: 10.100.10.2 for the master and 10.100.10.3 for a backup router for
example.
The hosts on the LAN, however only know the IP address of this virtual router or
10.100.10.1 and as such, use this IP address as the address of the default next-hop
router when communicating with the external network.
When the master in the standby group fails, the backup routers in the standby group
elects a new master to take over, allowing the hosts on the network to communicate
with the external network without interruption.
For more information about VRRP, refer to RFC 2338.

3.2 VRRP Configurations

The basic VRRP configuration tasks are described in the following sections:
Enabling/Disabling Virtual IP Address Pinging
Adding or Deleting a Virtual IP Address
Configuring Router Priority in a Standby Group
Configuring Preemption Mode and Preemption Delay
The advanced VRRP configuration tasks are described in the following sections:
Configuring Authentication Mode and Authentication Key
Configuring the Adver_Timer of VRRP
Configuring Interface Tracking
Configuring TTL Check on VRRP Packets
Network Network
Virtual IP address Virtual IP address
10.100.10.1 10.100.10.1
Ethernet Ethernet
10.100.10.1 10.100.10.1
10.100.10.1 10.100.10.1
Host 2 Host 2
Host 1 Host 1
3Com Corporation
Chapter 3 VRRP Configurations
10.100.10.3 10.100.10.3
Router B Router B
Backup Backup
LAN 1 LAN 1
Host 3 Host 3
3-2