Technical data

Brocade ServerIron ADX Advanced Server Load Balancing Guide 71
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Other transparent cache switching options
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High availability support
Because sessions are synced between ServerIron ADX devices, passive FTP for TCS also supports
the high availability (HA) topology. The most common HA setup is Symmetric Active-Active HA mode.
Figure 15 shows an example of a Layer 2 Symmetric Active-Active HA setup.
FIGURE 15 Layer 2 Symmetric Active-Active high availability setup
Asymmetric flow
The control and data traffic between a client and cache server or between a cache server and a
real server can be asymmetric, as described in Figure 16.
FIGURE 16 Asymmetric flow example
ServerIron ADX failover
Failover of the router or ServerIron ADX device is supported.
Configure VRRP on routers R1 and R2. Where R1 is the master or default gateway for both the
client and cache server, the flow will be as shown in Figure 17.
FIGURE 17 Normal flow before failover