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Asymmetric mode
This mode lets the link partner send flow control pause frames to the
GBIC port. When a pause frame is received, the receiving port suspends
transmission of frames for a number of slot times specified in the control
frame or until a pause-release control frame is received.
In this mode, the GBIC port is disabled from transmitting pause frames to its
link partner. Use this mode when the GBIC port is connected to a buffered
repeater device.
You can choose a high speed flow control mode using CLI commands. For
more information about the commands see "Enabling flow control" (page
240).
Rate Limiting Configuration
The Rate Limiting feature lets you configure the threshold limits for broadcast
and multicast packets ingressing on a port for a given time interval. The
Ethernet Routing Switch 2500 Series drops any packets received above the
threshold value if the traffic ingressing on the port exceeds the threshold.
The hardware restrictions on this platform do not allow you to determine if
the traffic from a port is the cause of excess broadcast or multicast traffic.
Consequently you cannot perform port specific actions such as disabling
a port. You can generate a trap to detect the excess traffic or you can
configure the switch to store a message in the system log when the traffic
on the port exceeds the threshold value. This message in the system log
conveys that some traffic to the switch is dropped.
When the volume of either packet type is high, placing severe strain on
the network (often referred to as a "storm"), you can set the forwarding
rate of those packet types to not exceed a specified percentage of the total
available bandwidth. The pps (Packets Per Second) value you set is a small
amount of the maximum value of pps for the maximum available bandwidth
that is 262143 pps.
ATTENTION
All Rate Limiting configuration settings are applied across the entire unit. You
cannot set some ports in the unit to limit broadcast traffic with a value of X pps
and some other ports in the same to limit multicast traffic with a value of Y pps.
Other features
RFCs
For more information about networking concepts, protocols, and topologies,
consult the following RFCs:
•
RFC 1213 (MIB-II)
Nortel Ethernet Routing Switch 2500 Series
Overview — System Configuration
NN47215-500 (323162-B) 02.02 Standard
4.1 19 November 2007
Copyright © 2007, Nortel Networks
.