Enabling Time Stamp Control; B Port Interoperability Mode - Cisco MDS 9000 series Configuration Manual

Chapter 2 Configuring FCIP
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m
To enable the passive mode, follow these steps:
Command
Step 1
switch(config-if)# passive-mode
switch(config-if)# no passive-mode
Step 2
switch(config-if)# no shutdown

Enabling 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.
The default value for packet acceptance is 2000 microseconds.If the time-stamp option is enabled, be
Note
sure to configure NTP on both switches (see the Cisco NX-OS Fundamentals Configuration Guide for
more information).
Tip Do not enable time stamp control on an FCIP interface that has tape acceleration or write acceleration
configured.
To enable or disable the time stamp control, follow these steps:
Command
Step 1
switch(config-if)# time-stamp
Please enable NTP with a common time
source on both MDS Switches that are
on either side of the FCIP link
switch(config-if)# no time-stamp
Step 2
switch(config-if)# time-stamp
acceptable-diff 4000
switch(config-if)# no time-stamp
acceptable-diff 500
Step 3
switch(config-if)# no shutdown

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.
OL-19525-01,Cisco MDS NX-OS Release 4.2(1)
Purpose
Enables passive mode while attempting a TCP connection.
Reverts to the factory set default of using the active mode
while attempting the TCP connection.
Enables the interface.
Purpose
Enables time stamp checking for received packets with a
default acceptable time difference of 2000 msec.
Disables (default) time stamps.
Configures the packet acceptance time. The valid range is
from 500 to 10,000 msec.
Deletes the configured time difference and reverts the
difference to factory defaults. The default difference is a
2000-millisecond interval from the network time.
Enables the interface.
Figure 2-11 shows a typical SAN extension over an IP network.
Cisco MDS 9000 Family NX-OS IP Services Configuration Guide
Configuring FCIP
2-19