HP 445946-001 - Manual (Page 178)

High availability
178
High availability configurations
The HP 10GbE switches offer flexibility in implementing redundant configurations. This section discusses
the Active-Active configuration.
Active-Active configuration
The following figure shows an example configuration, where two switches are used as VRRP routers in an
active-active configuration. In this configuration, both switches respond to packets.
Figure 27 Active-Active high availability configuration
Although this example shows only two switches, there is no limit on the number of switches used in a
redundant configuration. It is possible to implement an active-active configuration across all the
VRRP-capable switches in a LAN.
Each VRRP-capable switch in an active-active configuration is autonomous. Switches in a virtual router
need not be identically configured.
In the scenario illustrated in the figure, traffic destined for IP address 10.0.1.1 is forwarded through the
Layer 2 switch at the top of the drawing, and ingresses Switch A on port 20. Return traffic uses default
gateway 1 (192.168.1.1). If the link between Switch A and the Layer 2 switch fails, Switch B becomes
the Master because it has a higher priority. Traffic is forwarded to Switch B. Return traffic uses default
gateway 2 (192.168.2.1), and is forwarded through the Layer 2 switch at the bottom of the drawing.
To implement the active-active example, perform the following switch configuration.
Task 1: Configure Switch A
1. Configure ports.
/cfg/l2/vlan 10 (Select VLAN 10)
>> VLAN 10# ena (Enable VLAN 10)
>> VLAN 10# add 20 (Add port 20 to VLAN 10)
>> VLAN 10# ..
>> Layer 2# vlan 20 (Select VLAN 20)
>> VLAN 20# ena (Enable VLAN 20)
>> VLAN 20# add 21 (Add port 21 to VLAN 20)