24-17
Cisco MDS 9000 Fabric Manager Switch Configuration Guide
OL-7753-01
Chapter 24 Configuring IP Storage
Configuring FCIP
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.