Technical data

11-8 Fabric OS Administrator’s Guide
Publication Number: 53-0000518-09
Trunking Over Distance
11
4. Repeat step 3 for the remote extended ISL port. Both the local and remote extended ISL ports must
be configured to the same distance level. When the connection is initiated, the fabric will
reconfigure.
The following example configures slot 1, port 1 for the LD link distance mode, enables the extended
link initialization sequence, and sets the desired distance to 50 kilometers:
Trunking Over Distance
Refer to “Trunking Over Extended Fabrics” on page 12-9.
vc_translation_link_init This extended link initialization sequence, which is an enhanced link
reset protocol, avoids excessive resetting of ports.
By default this option is set to 1 (enabled).
To prevent fabric segmentation, this option must be set to 0 (disabled)
when connecting to switches running Fabric OS versions earlier than
v3.0.2c or v4.0.2.
It must be set to 1 (enabled) when configuring a trunk over extended
fabrics.
desired_distance Required for a port configured for LD mode. Specify the desired
distance, in kilometers, for the link. The specified value is the upper
limit for calculating buffer availability for the port. If the measured
distance is more than the specified desired_distance, the port is
allocated the number of buffers required by the specified desired
distance. (Fabric OS versions earlier than v4.4.0 do not support this
parameter.)
Note: For SilkWorm 48000 with FC4-16 or FC4-32 port blades, ports
will be shown as buffer limited.
switch:admin> portcfglongdistance 1/1 LD 1 50
switch:admin>