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48-25
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 48 Configuring FCIP
Using the FCIP Wizard
Active Connections
You can configure the required mode for initiating a TCP 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 rather waits for the peer to connect to it.
Note Ensure that both ends of the FCIP link are not configured as passive mode. If both ends are configured
as passive, the connection is not initiated.
Number of TCP Connections
You can specify the number of TCP connections from an FCIP link. By default, the switch tries two (2)
TCP connections for each FCIP link. You can configure one or two TCP connections. For example, the
Cisco PA-FC-1G Fibre Channel port adapter, which has only one (1) TCP connection, interoperates with
any switch in the Cisco MDS 9000 Family. One TCP connection is within the specified limit. If the peer
initiates one TCP connection, and your MDS switch is configured for two TCP connections, then the
software handles it and proceeds with just one connection.
Time Stamp Control
You can instruct the switch to discard packets that are outside the specified time. When enabled, this
feature 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, time stamp control is disabled in all switches in the Cisco MDS 9000 Family. If a packet
arrives within a 2000 millisecond interval (+ or –2000 msec) from the network time, that packet is
accepted.
Note The default value for packet acceptance is 2000 microseconds.
If the time-stamp option is enabled, be sure to configure NTP on both switches (see the “NTP
Configuration” section on page 12-4).
Tip Do not enable time stamp control on an FCIP interface that has tape acceleration or write acceleration
configured.
FCIP 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.
Figure 48-20 shows a typical SAN extension over an IP network.
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