Specifications

Chapter 5. IBM System Networking RackSwitch implementation 223
5.4.1 Virtual Router Redundancy Protocol
The RackSwitch G8264 and RackSwitch G8124 switches support IPv4 high-availability
network topologies through an enhanced implementation of VRRP.
VRRP enables redundant router configurations within a LAN, providing alternative router
paths for a host to eliminate single points of failure within a network. Each participating
VRRP-capable routing device is configured with the same virtual router IPv4 address and ID
number. One of the virtual routers is selected as the master, based on a number of priority
criteria, and assumes control of the shared virtual router IPv4 address. If the master fails, one
of the backup virtual routers takes control of the virtual router IPv4 address and actively
processes traffic addressed to it.
For detailed information about VRRP concepts and components, see 2.7.6, “Virtual Router
Redundancy Protocol” on page 82.
VRRP is configured on ACC-1 and ACC-2 G8124 access switches only, to provide gateway
redundancy for SRV-1.
Complete the following steps to enable, configure, and verify VRRP in IBM Networking
OS switches:
1. Enable VRRP.
Run router vrrp to enter the VRRP configuration mode and enable to activate the
protocol on both ACC-1 and ACC-2 switches (Example 5-66).
Example 5-66 Enable VRRP
ACC-1#configure terminal
Enter configuration commands, one per line. End with Ctrl/Z.
ACC-1(config)#router vrrp
ACC-1(config-vrrp)#enable
ACC-2#configure terminal
Enter configuration commands, one per line. End with Ctrl/Z.
ACC-2(config)#router vrrp
ACC-2(config-vrrp)#enable
2. Configure the virtual router.
Complete the following steps to configure the virtual router:
a. Configure the virtual router ID (Example 5-67).
Up to 15 virtual router instances can be defined in IBM Networking OS 6.8.
Run virtual-router <1-15> virtual-router-id <1-255> in VRRP configuration
mode to define the the virtual router ID (VRID). To create a pool of VRRP-enabled
routing devices that can provide redundancy to each other, each participating VRRP
device must be configured with the same virtual router.
The VRID for standard virtual routers (where the virtual router IP address is not the
same as any virtual server) can be any integer 1 - 255. The default value is 1. All VRID
values must be unique within the VLAN to which the virtual router’s IP
interface belongs.
Example 5-67 Virtual router ID configuration
ACC-1#configure terminal
Enter configuration commands, one per line. End with Ctrl/Z.