BLADE OS™ Application Guide HP GbE2c Ethernet Blade Switch for c-Class BladeSystem Version 5.1 Advanced Functionality Software

BLADE OS 5.1 Application Guide
246  Chapter 14: High Availability BMD00113, September 2009
High Availability Configurations
Figure 33 shows an example configuration where two GbE2c modules are used as VRRP routers in
an active-active configuration. In this configuration, both switches respond to packets.
Figure 33 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 Figure 33, 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, which
forwards it to Switch A through the crosslink port. 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.
Internet
Internet
Enterprise
Routing Switch
Server 1
VIR 1: 192.168.1.200 (Master)
VIR 2: 192.168.2.200 (Backup)
VIR 1: 192.168.1.200 (Backup)
VIR 2: 192.168.2.200 (Master)
NIC 1: 10.0.1.1/24
NIC 2: 10.0.2.1/24
NIC 1: 10.0.1.2/24
NIC 2: 10.0.2.2/24
NIC 1: 10.0.1.3/24
NIC 2: 10.0.2.3/24
NIC 1: 10.0.1.4/24
NIC 2: 10.0.2.4/24
Server 2
Server 3
Server 4
L2 Switch
L2 Switch
20
21
20
21
Switch A
Switch B