Configuration Guide User guide

42 FastIron Configuration Guide
53-1002494-02
Basic port parameter configuration
NOTE
Auto negotiated FESX combo ports may flap for a few seconds before the link is up.
NOTE
On Brocade ICX 6610 and Series devices, after you remove 10 Gbps speed from the running
configuration, plugging in a 1G optic SFP transceiver into a 10 Gbps port causes the software to fail
to revert the ports back from the default 10G LRM mode to 1 Gbps speed. Remove the 1G SFP
transceiver and plug in the 10G optic SFP+transceiver so that the Brocade ICX 6610 devices go into
default 10 Gbps LRM mode..
Enabling auto-negotiation maximum port speed
advertisement and down-shift
NOTE
For optimal link operation, link ports on devices that do not support 803.3u must be configured with
like parameters, such as speed (10,100,1000), duplex (half, full), MDI/MDIX, and Flow Control.
NOTE
Auto negotiated FESX combo ports may flap for a few seconds before the link is up.
Maximum Port speed advertisement and Port speed down-shift are enhancements 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.
Port speed down-shift enables Gbps copper ports on the Brocade device to establish a link at 1000
Mbps over a 4-pair wire when possible, or to down-shift to 100 Mbps if the medium is a 2-pair wire.
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 port speed down-shift and maximum port speed advertisement features operate 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 port speed down-shift and maximum port speed advertisement features operate 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 or port speed
down-shift configuration.