Technical data

FastIron Ethernet Switch Administration Guide 45
53-1002637-02
Basic port parameter configuration
2
Maximum Port speed advertisement is an enhancement to the auto-negotiation feature, a
mechanism for accommodating multi-speed network devices by automatically configuring the
highest performance mode of inter-operation between two connected devices.
Maximum port speed advertisement enables you to configure an auto-negotiation maximum speed
that Gbps copper ports on the Brocade device will advertise to the connected device. You can
configure a port to advertise a maximum speed of either 100 Mbps or 10 Mbps. When the
maximum port speed advertisement feature is configured on a port that is operating at 100 Mbps
maximum speed, the port will advertise 10/100 Mbps capability to the connected device.
Similarly, if a port is configured at 10 Mbps maximum speed, the port will advertise 10 Mbps
capability to the connected device.
The maximum port speed advertisement feature operates dynamically at the physical link layer
between two connected network devices. They examine the cabling conditions and the physical
capabilities of the remote link, then configure the speed of the link segment according to the
highest physical-layer technology that both devices can accommodate.
The maximum port speed advertisement feature operates dynamically at the physical link layer,
independent of logical trunk group configurations. Although Brocade recommends that you use
the same cable types and auto-negotiation configuration on all members of a trunk group, you
could utilize the auto-negotiation features conducive to your cabling environment. For example, in
certain circumstances, you could configure each port in a trunk group to have its own
auto-negotiation maximum port speed advertisement.
Maximum port speed application notes
• The maximum port speed advertisement works only when auto-negotiation is enabled (CLI
command speed-duplex auto). If auto-negotiation is OFF, the device will reject the maximum
port speed advertisement configuration.
• When the 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).
Configuring maximum port speed advertisement
NOTE
This is not supported in ICX devices.
To configure a maximum port speed advertisement of 10 Mbps 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 10m ethernet 1
To configure a maximum port speed advertisement of 100 Mbps on a port that has
auto-negotiation enabled, enter the following command at the Global CONFIG level of the CLI.
Brocade(config)# link-config gig copper autoneg-control 100m ethernet 2
Syntax: [no] link-config gig copper autoneg-control 10m | 100m ethernet port [ethernet [port]
You can enable maximum port speed advertisement on one or two ports at a time.
To disable maximum port speed advertisement after it has been enabled, enter the no form of the
command.