Configuration Guide User guide

FastIron Configuration Guide 43
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Basic port parameter configuration
Maximum port speed application notes
Port speed down-shift and maximum port speed advertisement work only when
auto-negotiation is enabled (CLI command speed-duplex auto). If auto-negotiation is OFF, the
device will reject the port speed down-shift and maximum port speed advertisement
configuration.
When port speed down-shift or maximum port speed advertisement is enabled on a port, the
device will reject any configuration attempts to set the port to a forced speed mode (100 Mbps
or 1000 Mbps).
When the port speed down-shift feature is enabled on a combo port, the port will not support
true media automatic detection, meaning the device will not be able to detect and select the
fiber or copper connector based on link availability.
Enabling port speed down-shift
To enable port speed down-shift on a port that has auto-negotiation enabled, enter a command
such as the following at the Global CONFIG level of the CLI.
Brocade(config)# link-config gig copper autoneg-control down-shift ethernet 1
ethernet 2
The above command configures Gbps copper ports 1 and 2 to establish a link at 1000 Mbps over a
4-pair wire when possible, or to down-shift (reduce the speed) to 100 Mbps when the medium is a
2-pair wire.
Syntax: [no] link-config gig copper autoneg-control down-shift ethernet <port> [ethernet <port>] |
to <port>...
Specify the port variable in one of the following formats:
FWS, FCX, and ICX stackable switches – stack-unit/slotnum/portnum
FSX 800 and FSX 1600 chassis devices – slotnum/portnum
FESX compact switches – portnum
You can list all of the ports individually, use the keyword to to specify ranges of ports, or a
combination of both.
You can enable port speed down-shift on one or two ports at a time.
To disable port speed down-shift after it has been enabled, enter the no form of the command.
Configuring port speed down-shift and auto-negotiation for a range of ports
Port speed down-shift and auto-negotiation can be configured for an entire range of ports with a
single command.
For example, to configure down-shift on ports 0/1/1 to 0/1/10 and 0/1/15 to 0/1/20 on the
device, enter the following.
Brocade(config)# link-config gig copper autoneg-control down-shift ethernet 0/1/1
to 0/1/10 ethernet 0/1/15 to 0/1/20
To configure down-shift on ports 5 to 13 and 17 to 19 on a compact switch, enter the following.
Brocade(config)# link-config gig copper autoneg-control down-shift ethernet 5 to
13 ethernet 17 to 19