Trusted, Untrusted, And Unrestricted Interfaces - Nortel 4524GT Configuration

A meter applied to a policy has that metering criteria applied to each port
of the interface group (role combination). In other words, the specified
bandwidth is allocated on each port, not distributed across all ports.
Using meters, a Committed Rate in Kb/s (1000 b/s in each Kb/s) can
be set. All traffic within this Committed Rate is In-Profile. Additionally, a
Maximum Burst Rate can be set that specifies an allowed data burst larger
than the Committed Rate for a brief period. After this is set, the system
offers suggestions in choosing the Duration for this burst. Combined, these
parameters define the In-Profile traffic.
The range for the committed rate is 64 to 32000000 Kb/s.
An example of traffic policing is limiting traffic entering a port to a specified
bandwidth, such as 5000 Kb/s (Committed Rate). Instead of dropping all
traffic that exceeds this threshold, a Maximum Burst Rate can be configured
to exceed the threshold (Committed Rate), for a brief period of time
(Duration), without being dropped.
The range for the committed rate is 64 to 32000000 Kb/s.
Meter definitions where the committed burst size is too small, based on the
requested committed rate, are rejected. The committed burst size can be
only one of the following discrete values (in bytes): 4096 (4K), 8192 (8K),
16384 (16K), 32768 (32K), 65536 (64K), 131072 (128K), 262144 (256K),
524288 (512K), 1048576 (1024K), 16777216 (16384K), 2097152 (2048K),
4194304 (4096K), 8388608 (8192K).

Trusted, untrusted, and unrestricted interfaces

Nortel Ethernet Routing Switch 4500 Series ports are classified into three
categories:
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The classifications of trusted, untrusted, and unrestricted actually apply to
groups of ports (interface groups). These three categories are also referred
to as interface classes. In your network, trusted ports are usually connected
to the core of the DiffServ network, and untrusted ports are typically access
links that are connected to end stations. Unrestricted ports can be either
access links or connected to the core network.
Copyright © 2007, Nortel Networks
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trusted
untrusted
unrestricted
Nortel Ethernet Routing Switch 4500 Series
Configuration — Quality of Service
NN47205-504 (322816-B)
5.1 23 November 2007
Trusted, untrusted, and unrestricted interfaces 29
ATTENTION
ATTENTION
03.01 Standard