Allied Telesis AT-S62 - Manual (Page 116)

Chapter 6: Port Parameters
116 Section I: Basic Operations
The options on the Back Pressure menu are described below:
1 - Back Pressure
Enables and disables backpressure on a port. Possible values are:
Disabled The port will not use backpressure. This is the default
setting.
Enabled The port will use backpressure.
2 - Back Pressure Cell Limit
Specifies the number of cells. A cell represents 64 bytes. The range is
1 to 57,344 cells. The default is 8192.
L - Rate Limit
For instructions, refer to “Setting the Rate Limit” on page 118.
U - Unknown Multicast Filtering
Discards all unknown ingress multicast packets on a port when
activated. This feature can help improve switch performance in
instances where a multicast stream arrives on a port of a switch where
there are no host nodes. Without the feature, the unknown multicast
packets would be flooded out all ports of the same VLAN as the
ingress port. With the feature, the unknown multicast packets are
discarded at the ingress port, reducing the number of packets that the
switch must forward. The default setting is disabled.
A dynamic multicast address is added to the address table only after a
host node responds with a request to join the group. Consequently, it is
possible to activate this feature on a port and have it filter the packets
even after the port has started receiving a multicast stream.
This feature does not filter multicast queries.
Possible settings are:
Enabled The port discards unknown ingress multicast packets.
Disabled The port forwards unknown ingress multicast packets. This
is the default setting.
D - Set Default Port Configuration
Resets all port settings to the default values.
F - Force Renegotiation
If the port is already operating in Auto-Negotiation, this options
prompts the port to Auto-Negotiate again with the end node. This can
be helpful if you believe that a port and end node are not operating at
the same speed and duplex mode. If the port’s speed and duplex
mode have been set manually, this option returns the port to Auto-
Negotiation.