ATM QoS Traffic Descriptor Profiles
398
Quality of Service Guide
3HE 11014 AAAC TQZZA Edition: 01
traffic
Syntax traffic [sir sir-val [pir pir-val] [mir mir-val] [mbs mbs-val] [cdvt cdvt-val]
no traffic
Context config>qos>atm-td-profile
Description This command is used to configure traffic attributes of an ATM traffic profile as per ATM
Forum Traffic Management Specification Version 4.1.
The traffic parameters of a traffic descriptor that are configurable depend on the service
category of this traffic descriptor profile. (See the service-category command.)
Table 58 defines which traffic descriptor parameters are applicable for what service category
and what the configuration rules are between the parameters. “Y” indicates that the
parameter can be configured for a given service category and will be defaulted if not provided,
and an “N/A” indicates that the parameter cannot be configured for a given service category
(an error will be returned). If an applicable parameter is not specified, the current value will
be preserved.
When a traffic descriptor profile is used to define egress scheduling, the following describes
how traffic rates are used to derive scheduling weight:
The scheduling weight applies only to unshaped nrt-VBR and UBR. The scheduling weight is
a value from 1 to 8. The scheduling weight is determined by the SIR value for nrt-VBR, and
by the MIR value for UBR. The conversion from SIR/MIR to weight is as follows:
• Rate < 64K weight = 1
• Rate < 128K weight = 2
• Rate < 256K weight = 3
• Rate < 512K weight = 4
• Rate < 1024K weight = 5
• Rate < 1536K weight = 6
Table 58 Service Category Traffic Descriptor Parameters
Service
Category
SIR PIR MBS MIR CDVT
CBR N/A Y N/A N/A Y
rt-VBR Y Y (must be ≥ SIR) Y N/A Y
nrt-VBR Y Y (must be ≥ SIR) Y N/A Y
UBR N/A Y N/A N/A Y
UBR with MIR N/A Y (must be ≥ MIR N/A Y (non-zero
MIR specified)
Y
To Next Page
Loading...
