Allied Telesis AR400 Series Router - Manual (Page 77)

Physical and Layer 2 Interfaces 77
Software Release 2.6.1
C613-02021-00 REV D
On the AR450 only, Auto MDI/MDI-X is disabled when a switch port is set to a specific
speed and duplex mode.
On the AR450 only, it is also possible to require a switch port to operate at a
single speed without disabling autonegotiation by allowing the port to
autonegotiate, but constrain the speed/duplex options to the desired
combination. For example, if one end of a link is set to AUTO and other to
100MFULL then the AUTO end will select 100MHALF operation because
without the other end autonegotiating the AUTO end has no way of knowing
that the fixed end is full duplex capable. If a particular speed is required it is
usually preferable to fix the speed/duplex combination using one of the
autonegotiating speed values. Therefore, using 100MFAUTO at one end of a
link and will allow the AUTO end to autonegotiate 100MFULL.
On the AR410 only, to change this setting use the command:
SET SWITCH PORT={port-list|ALL}
SPEED={AUTONEGOTIATE|10MHALF|10MFULL|100MHALF|100MFULL}
The SPEED parameter specifies the configured line speed and duplex mode of
the port(s). If AUTONEGOTIATE is specified, the port(s) autonegotiate the line
speed and duplex mode with the device attached to the port. If any other
option is specified, the port(s) are forced to the speed and duplex mode given.
The default is AUTONEGOTIATE.
On the AR450 only, to change this setting use the command:
SET SWITCH PORT={port-list|ALL}
SPEED={AUTONEGOTIATE|10MHALF|10MFULL|10MHAUTO|10MFAUTO|10
0MHALF|100MFULL|100MHAUTO|100MFAUTO} [other-options...]
The SPEED parameter specifies the configured line speed and duplex mode of
the port(s). If AUTONEGOTIATE is specified, the port(s) will autonegotiate the
highest mutually possible line speed and duplex mode with the link partner. If
one of 10MFAUTO, 10MHAUTO, 100MFAUTO, or 100MHAUTO is specified,
the port will autonegotiate with the link partner, but only accept operation at
the specified speed and duplex mode. If one of 10MHALF, 10MFULL,
100MHALF, or 100MFULL is specified, then autonegotiation is disabled and
the interface is forced to operate at the specified speed and duplex mode,
regardless of whether the link partner is capable of working at that speed. The
default is AUTONEGOTIATE.
Limiting Switch Traffic (AR410 only)
You can make some choices about how switch ports respond when there is
more traffic than the network or the switch ports can handle easily. Any choices
you make affect all switch ports on the base router unit.
The default settings for commands that limit traffic are adequate for most
situations.
By default, back pressure for flow control for half duplex ports is turned on:
SET SWITCH BACKPRESSURE=ON
By default, flow control using pause frames for full duplex ports is turned on:
SET SWITCH FLOWCONTROL=ON