TMS zl Management and Configuration Guide ST.1.2.100916

8-8

High Availability

Configuring High Availability

Before you configure HA, review this summary of HA behavior and

functionality:

■ Only one HA cluster (two modules) is supported in a single switch chassis.

■ You cannot install HA cluster members that are members of different

clusters in the same switch chassis.

■ All cluster members must be running the same software version. Modules

that are configured for the same HA cluster but that have different

software versions will ignore each other.

■ All cluster members must be operating in the TMS routing mode.

■ The order in which you configure the HA cluster members is important.

The first member that is booted and comes online is the cluster master.

■ If you use IDS/IPS signatures, HP strongly recommends that you have an

IDS/IPS subscription for each module. (See “IDS/IPS and HA” on page 8-7.)

■ If cluster members are in different switch chassis, follow these guidelines

(See “Linking Inter-Chassis Clusters” on page 8-5):

• You must ensure that the same TMS VLANs are configured on both

host switches; otherwise, the configuration will not properly fail over.

• You should have redundant connections between the host switches,

and MSTP or RSTP should be implemented to prevent loops.

• The switch ports that connect the host switches should be tagged

members of the HA VLAN.

• Other network devices should not be placed between the switch

chassis that contain the cluster members to reduce the risk of link

failure.

■ Not all connections fail over from master to participant. (See Table 8-1 on

page 8-7.)

■ HP strongly recommends that:

• You back up the configuration of the master before you begin config-

uring the HA cluster.

• You change the default HA VLAN (VLAN 1) to a dedicated VLAN that

does not carry general data traffic.

• You do not associate the HA VLAN with a zone or give the host switch

an IP address on the HA VLAN.