Allied Telesis AT-S97 - Manual (Page 93)

AT-S85 and AT-S97 Management Software Command Line Interface User’s Guide
93
connected to the ports, should be using the same duplex mode. A media
converter channel may have to discard packets if its two ports are
operating in different modes, one half-duplex and the other full-duplex.
This could result in a decrease of network performance if the network
devices have to frequently retransmit packets.
For example, if the network device connected to the twisted pair port of a
media converter channel is only capable of half-duplex mode, then both
ports of the channel and the network device connected to the fiber optic
port in the channel should be configured to operate in half-duplex mode as
well.
Also featured on the twisted pair ports of a media converter module is
auto-MDI/MDI-X, which automatically adjusts the wiring configuration of a
twisted pair port to either MDI or MDI-X, depending on the wiring
configuration of the end node. This feature allows the use of a straight-
through twisted pair cable regardless of the wiring configuration of the port
on the network device.
The auto-MDI/MDI-X feature is only available when a twisted pair port is
using Auto-Negotiation, the default setting. Disabling Auto-Negotiation and
manually configuring a port’s speed and duplex mode also disables this
feature. The wiring configuration of a port defaults to the MDI-X setting.
Disabling Auto-Negotiation may require the manual configuration of the
MDI/MDI-X setting on a port or the use a crossover cable, depending on
the wiring configuration of the network device connected to the port on the
module.
The INGRESS-RATE-LIMIT and EGRESS-RATE-LIMIT parameters
control the flow of network traffic to and from a port in a channel to its
network device. The rate limits, which are in kilobits and megabits per
second, can be applied separately to the two ports of a channel. The rate
limits can be used for storm prevention and to protect against the
formation of bottlenecks in a network topology,
The INGRESS-RATE-LIMIT feature controls the number of bits per
second a port accepts from the device connected to it. The port discards
frames after the limit is exceeded. For example, an ingress rate limit of
128k limits a port to no more than 128 kilobits per second in traffic flow
from its network device.
The EGRESS-RATE-LIMIT controls the number of bits per second a port
transmits to the network device connected to it.
The INGRESS-RATE-LIMIT and EGRESS-RATE-LIMIT parameters are
not supported on the 10/100/100Base-T Management port on the
management module.