The various traffic classification methods used on the 7705 SAR are described in Table: Traffic Classification Types . A list of classification rules follows the table.
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 function in the same way as 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. |
FR (for Fpipes) and HDLC SAPs |
Traffic from an access ingress SAP is mapped to the selected (default) forwarding class. |
DSCP bits |
When the Ethernet payload is IP, ingress traffic can be mapped to a maximum of eight forwarding classes based on DSCP bit values. DSCP-based classification supports untagged, single-tagged, double-tagged, and triple-tagged Ethernet frames. If an ingress frame has more than three VLAN tags, then dot1q or qinq dot1p-based classification must be used. |
Multi-field classifiers |
Traffic is classified based on any IP criteria currently supported by the 7705 SAR filter policies; for example, source and destination IP address, source and destination port, whether or not the packet is fragmented, ICMP code, and TCP state. For information on multi-field classification, refer to the 7705 SAR Router Configuration Guide, ‟Multi-field Classification (MFC)” and ‟IP, MAC, and VLAN Filter Entry Commands”. |