Accessing The Switch Using Telnet - HP StorageWorks 8B - FC Entry Switch User Manual

3
Using Remote Switch

Accessing the Switch Using Telnet

3-2
In addition to normal switch configuration options, the following parameters must be
configured:
• Timeout values
The Resource Allocation Timeout Value (R_A_TOV) and Error Detect Timeout
Value (E_D_TOV) must be increased, as appropriate, for all switches participating in
the Remote Switch fabric. This provides for the possible increase in transit time
caused by the introduction of WAN links into the fabric. For more information about
timeout values, refer to Fabric OS Reference Manual.
• Data field size
All switches participating in the Remote Switch fabric must have the data field size
configured to a maximum of 2048 bytes to accommodate the maximum field size
supported by the ATM gateway. Data field sizes smaller than 2048 bytes can be set,
but they may cause significant performance degradation.
• Class F frame suppression
All switches participating in the Remote Switch fabric must have the Class F frame
suppression flag set. Class F frames are automatically converted to Class 2 frames.
• BB credit
The setting for BB credit must be the same on both switches.
To set the BB_Credit on a switch that is running with a Remote Fabric license:
1. Use the configure command. This will select the BB_Credit that will be used.
2. Say "Y" to the fabric parameters, and the second option is BB_credit. You may
then set the parameters to any allowed value.
Note: Currently the parameter values are set at 1-16, but the values will soon be changed
to allow any value from 1-27. The parameters will then become the BB_Credit that
is offered to all F_Ports, and any E_Ports that are using the Remote Fabric feature.
E_ports that are not remote fabric E_Ports will not be affected.
Note: You must set the same BB_Credit value to all switches in the fabric. Switches with
a different value will segment.
The telnet command configure is used to set the following:
• R_A_TOV and E_D_TOV values.
• Data field size.
• Class F frame suppression flag.
The switch must be disabled prior to entering the configure command.
Example:
switch:admin> configure
Configure. . .
Fabric parameters (yes, y, no, n): [no] yes
Brocade Distributed Fabrics User's Guide