Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual download pdf (Page 49)

ServerIron ADX Advanced Server Load Balancing Guide 37

53-1002435-01

Sample Deployment Topologies

The following table lists the entries that need to be programmed in the CAM for hardware

forwarding of pass-through traffic.

TCS with spoofing

In the following example configuration, the cache server is spoofing the client’s IP address instead

of using its own IP address when accessing the real server.

In flow 2a, the cache server is using the client’s IP address as the source address instead of using

its own IP address. There is no difference in the CAM programming for spoofing and non-spoofing

cases. Refer to Table 1 for CAM programming details.

TCS with destination NAT

If the cache server is operating in the promiscuous or transparent mode, it can receive packets for

any IP address. But, if the cache server requires that the client traffic arrive at the IP address of the

cache server, destination NAT must be enabled on the ServerIron. The following diagram illustrates

this.

TABLE 1 Required CAM programming for simple TCS configurations

Level Match Hash

1 Destination port Source IP address

2 Source port Destination IP address

Client

CIP

1a(CIP-RIP)

4b(RIP-CIP)

4a(RIP-CIP)

1b(CIP-RIP)

3a(RIP-CIP)

3b(RIP-CIP)

2b(CIP-RIP)

2aSpoofing (CIP-RIP)

CIP-Client IP Address

RIP-Real Server IP Address

VIP-Virtual IP Address

TIP-Cache Server IP Address

ServerIron

VIP

Real Server

RIP

Transparent

Cache Server

TIP

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 135 136

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Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual Page 49