440 Fabric OS Administrator’s Guide
53-1002446-01
ISL trunking over long distance fabrics
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Tx: Bandwidth 16.00Gbps, Throughput 1.67Gbps (12.12%)
Rx: Bandwidth 16.00Gbps, Throughput 1.66Gbps (12.11%)
Tx+Rx: Bandwidth 32.00Gbps, Throughput 3.33Gbps (12.11%)
ISL trunking over long distance fabrics
In long-distance fabrics, if a port speed is set to autonegotiate, then the maximum speed, which is
16 Gbps, is assumed for reserving buffers for the port. If the port is only running at 2 Gbps, this
wastes buffers. For long-distance ports, you should specify the port speed instead of setting it to
autonegotiate.
In addition to the criteria listed in “Supported configurations for trunking” on page 436, observe
the following criteria for trunking over extended fabrics:
• It is supported only on switches running Fabric OS v6.1.0 and later.
• Extended Fabrics and Trunking licenses are required on all participating switches.
• When configuring long distance, the portCfgLongDistance --vc_translation_link_init
parameter must be set the same on all ports in an extended fabric.
For additional information on configuring long distance, see “Configuring an extended ISL” on
page 453.
Table 75 describes Trunking over long distance support for the Backbones and supported blades.
The L0 mode supports up to 5 km at 2 Gbps, up to 2 km at 4 Gbps, and up to 1 km at 8 Gbps.
The distance for the LS mode is static. You can specify any distance greater than 10 km.
The distance supported depends on the available buffers, number of back-end ports, and the
number of ports that are offline. For more information on setting port speeds, refer to Chapter 3,
“Performing Advanced Configuration Tasks”.
EX_Port trunking
You can configure EX_Ports to use trunking just as you do regular E_Ports. EX_Port trunking
support is designed to provide the best utilization and balance of frames transmitted on each link
between the FC router and the edge fabric. You should trunk all ports connected to the same edge
fabrics.
TABLE 75 Trunking over distance for the Backbones
Long distance mode Distance Number of 2 Gbps ports Number of 4 Gbps ports
LE 10 km 48 (six 8-port trunks) 48 (six 8-port trunks)
L0 Normal See note below 48 (six 8-port trunks)
LD 200 km 4 (one 2-port trunk per switch) 0
LD 250 km 4 (one 2-port trunk per switch) 0
LD 500 km 0 0
LS Static See note below
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