TMS zl Management and Configuration Guide ST.1.2.100916

8-3
High Availability
Overview
Figure 8-1 shows the logical relationship between modules in active-standby
mode.
Figure 8-1. Active-Standby Mode
In active-standby mode, the master handles all network traffic, so the partic-
ipant does not have any IP addresses on the TMS VLANs; therefore, you cannot
access the Web browser interface for the participant. Any configuration
changes must be made to the master and then synchronized to the participant.
Failover
Because the TMS zl Module acts as peer router to its host switch, connections
can fail over to another member that is in the same switch chassis or another
member that is in a different switch chassis. When the master fails, the
participant takes over as the new master.
To see which traffic types fail over, refer to Table 8-1 on page 8-7.
If the cluster members are in different host switches, you must ensure the
following:
■ The same VLANs are configured on both host switches.
■ There are redundant Layer 2 connections between the host switches. See
“Configuration and Boot Order for HA Members” on page 8-4 for more
information.