Foundry Configuration Guide for the FESX, FSX, and FWSX
3 - 14 © Foundry Networks, Inc. December 2005
Configuration Syntax
To change the port speed of interface 8 from the default of 10/100/1000 auto-sense, to 10 Mbps operating at full-
duplex, enter the following:
FESX424 Router(config)# interface e 8
FESX424 Router(config-if-e1000-8)# speed-duplex 10-full
Syntax: speed-duplex <value>
The <value> can be one of the following:
• 10-full
• 10-half
• 100-full
• 100-half
• auto
The default is auto.
Enabling Auto-negotiation Maximum Port Speed Advertisement and
Port Speed Down-shift
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 Gigabit copper ports on the Foundry device to establish a link at 1000 Mbps
over a 4-pair wire when possible, or to down-shift (reduce the speed) 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
Gigabit copper ports on the Foundry 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 enabled 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 operating 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. It examines the cabling conditions and the physical
capabilities of the remote link, then configures 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 Foundry 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.
Application Notes
• This feature is available in software release 02.3.01 and later.
• 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
To Next Page
Loading...
Need help?
General
