Quality of Service Guide QoS and QoS Policies
Edition: 01 3HE 11014 AAAC TQZZA 71
3.2.1.1 Traffic Classification Types
The various traffic classification methods used on the 7705 SAR are described in
Table 6. A list of classification rules follows the table.
Table 6 Traffic Classification Types
Traffic Classification
Based on...
Description
a channel group
(n × DS0)
Applies to 16-port T1/E1 ASAP Adapter card and 32-port T1/E1 ASAP Adapter card
ports, 2-port OC3/STM1 Channelized Adapter card ports, 12-port Serial Data
Interface card ports, 4-port T1/E1 and RS-232 Combination module ports, and 6-port
E&M Adapter card ports in structured or unstructured circuit emulation mode. In this
mode, a number of DS0s are transported within the payload of the same Circuit
Emulation over Packet Switched Networks (CESoPSN) packet, Circuit Emulation
over Ethernet (CESoETH) packet, or Structure-Agnostic TDM over Packet (SAToP)
packet. Thus the timeslots transporting the same type of traffic are classified all at
once.
an ATM VCI On ATM-configured ports, any virtual connection regardless of service category is
mapped to the configured forwarding class. One-to-one mapping is the only
supported option.
VP- or VC-based classifications are both supported. A VC with a specified VPI and
VCI is mapped to the configured forwarding class. A VP connection with a specified
VPI is mapped to the configured forwarding class.
an ATM service category Similar ATM service categories can be mapped against the same forwarding class.
Traffic from a given VC with a specified service category is mapped to the configured
forwarding class. VC selection is based on the ATM VC identifier.
an Ethernet port All the traffic from an access ingress Ethernet port is mapped to the selected
forwarding class. More granular classification can be performed based on dot1p or
DSCP bits of the incoming packets. Classification rules applied to traffic flows on
Ethernet ports behave similarly to access/filter lists. There can be multiple tiers of
classification rules associated with an Ethernet port. In this case, classification is
performed based on priority of classifier. The order of the priorities is described in
Hierarchy of Classification Rules.
an Ethernet VLAN
(dot1q or qinq)
Traffic from an access Ethernet VLAN (dot1q or qinq) interface can be mapped to a
forwarding class. Each VLAN can be mapped to one forwarding class.
IEEE 802.1p bits
(dot1p)
The dot1p bits in the Ethernet/VLAN ingress packet headers are used to map the
traffic to up to eight forwarding classes.
PPP/MLPPP,
FR (for Ipipes), and
cHDLC SAPs
Traffic from an access ingress SAP is mapped to the selected forwarding class. More
granular classification can be performed based on DSCP bits of the incoming
packets.
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