protocol fcip rule

src-ip <ip-address>	Specifies the connection source IP address of the FCIP gateway tunnel endpoints. Use the format XXX.XXX.XXX.XXX. The source IP address cannot be the same as the destination IP address.
dst-ip <ip-address>	Specifies the connection destination IP address of the FCIP gateway tunnel endpoints. Use the format XXX.XXX.XXX.XXX.
dif <enable \| disable>	Enables or disables this option to isolate and optimize the DIFs embedded within the FCIP data workload.
dif-blocksize <bytes>	Specifies the size of a standard block of storage data, in bytes, after which a DIF header begins. The valid range is from 1 - 2048 bytes. The default value is 512, which is a standard block size for Open System environments. When you enable DIF, RiOS FCIP optimization looks for a DIF header after every 512 bytes of storage data unless you change the default setting. Open System environments (such as Windows, UNIX, and Linux) inject the DIF header into the data stream after every 512 bytes of storage data. IBM iSeries (AS/400) host environments inject the DIF header into the data stream after every 520 bytes. This parameter is required when you enable DIF.

Environments with RF-originated SRDF traffic between VMAX arrays need additional configuration beyond enabling FCIP optimization. You need to add FCIP rules to isolate the Data Integrity Field (DIF) headers within the FCIP data stream. These DIF headers further interrupt the data stream. You can add or remove FCIP rules by defining a match for source or destination IP traffic.

The FCIP default rule optimizes all remaining traffic that has not been selected by another rule. It always appears as the last in the list. You cannot remove the default rule; however, you can change its DIF setting. The default rule uses 0.0.0.0 in the source and destination IP address fields, specifying all IP addresses. You cannot specify 0.0.0.0 as the source or destination IP address for any other rule.