Technical data

88 ServerIron ADX Administration Guide
53-1002434-01
Remapping processing for a forwarding module to a BP
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You can configure the device to forward Layer 2 and Layer 3 pass-through traffic to the CPU for
processing, instead of processing it in hardware. To do this, enter the following command.
ServerIronADX(config)# server cpu-forward
Syntax: [no] server cpu-forward
Hardware forwarding for non L4-7 traffic flows
The ServerIron ADX supports hardware forwarding of pass-through traffic in SLB and TCS modes.
The ServerIron ADX can be configured so that only Layer 4-7 traffic is processed by the CPU, and
pass-through traffic is forwarded in hardware.
Hardware forwarding is enabled by default in the following configurations:
• SLB only
• VIP SYN defense or VIP SYN proxy
• TCS only
• TCS cache-enabled
• Any combination of the above features
If any ServerIron ADX features other than those listed above are enabled on the device, then
hardware forwarding is disabled by default.
NOTES:
• If TCS is configured without source NAT and destination NAT, hardware forwarding is
disabled for the DMA to which the cache server is connected, if the ServerIron ADX
can determine this DMA. If the ServerIron ADX cannot determine this DMA, hardware
forwarding is disabled for all DMAs.
• Hardware forwarding is disabled if the TCS port is FTP, MMS, or RTSP.
• Hardware forwarding is disabled if the TCS Cache Server Spoofing feature is enabled.
• Pass-through traffic with a destination address that has the same last 13 bits as a
real server, cache server, or VIP may be treated as Layer 4-7 traffic and sent to the
CPU for processing.
• If CAM space is exhausted on the device, then hardware forwarding is disabled, and all
packets are sent to the CPU. While this situation is rare, it can occur in configurations
that have a large number of real servers or VIPs.
• Fragmented TCS packets may, in rare instances, be hardware forwarded.
• SLB DSR reverse traffic hardware forwarding is disabled if TCS cache-enable is ON.
• VIP-host-range is not supported.
Remapping processing for a forwarding module to a BP
You can remap processing for a forwarding module to a specific BP.
Brocade recommends that you change slot allocations only if Brocade technical support advises
the change or the documentation for a feature states that the change is required.
To remap processing for a forwarding module to a specific BP, enter a command such as the
following.