Allied Telesis AR400 SERIES Software Release 2.7.1 - Manual (Page 78)

78 AR400 Series Router User Guide
Software Release 2.7.1
C613-02021-00 REV F
Except on AR410 and AR410S models, Auto MDI/MDI-X is disabled when a switch
port is set to a specific speed and duplex mode.
On routers other than the AR410 or AR410S, 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 or AR410S, 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 routers other than the AR410 or AR410S, 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 and AR410S 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