- Enterasys Security Router User's Guide

IP Routing Protocols
5-28 Configuring IP
Figure 5-8 Simple VRRP Topology
Because the VR uses the IP address of the physical Ethernet interface of XSR1, XSR1 becomes the
master VR, also known as the IP address owner. XSR1, as the master VR, assumes the IP address of
the VR and is responsible for forwarding packets sent to this IP address.
Clients A, B, and C are configured with the default gateway IP address of 10.10.10.1.
XSR2 is a backup VR. If the master VR fails, XSR2 will take over as the master VR and support the
connected LAN hosts. When XSR1 comes back on line, it assumes the role of master VR again.
Figure 5-9 illustrates a topology where VRs XSR1 and XSR2 split outgoing traffic between them
and provide full system redundancy. ClientA and ClientB install a default route to XSR1’s VR IP
address and ClientC and ClientD install a default route to XSR2’s VR IP address. Both XSRs serve
dual master/backup roles.
Figure 5-9 Load Balanced, Redundant VRRP Topology
VRRP Definitions
The XSR defines VRRP terms as follows:
• VRRP Router - A router running the Virtual Router Redundancy Protocol. It may participate in
one or more VRs.
XSR1
VR Master VR Backup
XSR2
VR IP address: 10.10.10.1
ClientA ClientB ClientC
10.10.10.1
10.10.10.2
XSR1
VR Master1/Backup2
10.10.10.1
ClientA ClientB
ClientC
10.10.10.2
VR (Group 1)
XSR2
VR Master2/Backup1
ClientD
VR (Group 2)
IP address: 10.10.10.1
IP address: 10.10.10.2