Configuring Active Connection; Configuring The Number Of Tcp Connections; Enabling Time Stamps; B Port Interoperability Mode - Cisco DS-C9216I-K9 Configuration Manual

Chapter 24 Configuring IP Storage

Configuring Active Connection

Use the passive-mode option to configure the required mode for initiating an IP connection. By default,
active mode is enabled to actively attempt an IP connection.
If you enable the passive mode, the switch does not initiate a TCP connection and merely waits for the
peer to connect to it.
Ensure that both ends of the FCIP link are not configured as passive mode. If both ends are configured
as passive, the connection will not be initiated.

Configuring the Number of TCP Connections

Use the tcp-connection option to specify the number of TCP connections from a FCIP link. By default,
the switch tries two (2) TCP connections for each FCIP link. You can configure 1 or 2 TCP connections.
For example, the Cisco PA-FC-1G Fibre Channel port adapter which has only 1 (one) TCP connection
interoperates with any switch in the Cisco MDS 9000 Family. One TCP connection is within the
specified limit and you can change the configuration on the switch using the tcp-connection 1 command.
If the peer initiates one TCP connection, and your MDS switch is configured for two TCP connections,
the software handles it gracefully and moves on with just one connection.

Enabling Time Stamps

Use the time-stamp option to enable or disable FCIP time stamps on a packet. The time stamp option
instructs the switch to discard packets that are outside the specified time. By default, the time-stamp
option is disabled.
The acceptable-diff option specifies the time range within which packets can be accepted. If the packet
arrived within the range specified by this option, the packet is accepted. Otherwise, it is dropped. By
default if a packet arrives within a 1000 millisecond interval (+ or -1000 milliseconds), that packet is
accepted.
If the time-stamp option is enabled, be sure to configure NTP on both switches.

B Port Interoperability Mode

While E ports typically interconnect Fibre Channel switches, some SAN extender devices, such as
Cisco's PA-FC-1G Fibre Channel port adapter and the SN 5428-2 storage router, implement a bridge port
model to connect geographically dispersed fabrics. This model uses B port as described in the T11
Standard FC-BB-2. depicts a typical SAN extension over an IP network.
OL-7753-01
Cisco MDS 9000 Fabric Manager Switch Configuration Guide
Configuring FCIP
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