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Fabric OS Administrator’s Guide 541
53-1002745-02
EX_Port trunking
22
For additional information on configuring long distance, see “Configuring an extended ISL” on
page 553.
Table 79 summarizes support for Trunking over long-distance for the Backbones and supported
blades.
NOTE
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, the 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.
The FC router front domain has a higher node WWN—derived from the FC router—than that of the
edge fabric. Therefore, the FC router front domain initiates the trunking protocol on the EX_Port.
After initiation, the first port from the trunk group that comes online is designated as the master
port. The other ports that come online on the trunk group are considered to be the slave ports.
Adding or removing a slave port does not cause frame drop; however, removing a slave port causes
the loss of frames in transit.
The restrictions for EX_Port frame trunking are the same as for E_Ports—all the ports must be
adjacent to each other, in the clearly marked groups on the front of the product.
ATTENTION
This feature should be enabled only if the entire configuration is running Fabric OS v5.2.0 or later.
If router port cost is used with EX_Port trunking, the master port and slave ports share the router
port cost of the master port.
See Chapter 24, “Using FC-FC Routing to Connect Fabrics,” for more information about EX_Ports
and the FC router.
TABLE 79 Trunking over long-distance for the Backbones and blades
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