Huawei Quidway S7700 Configuration Manual - Qos page 12

Quidway S7700 Smart Routing Switch
Configuration Guide - QoS
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Issue 01 (2011-07-15)
Deny/Permit
The permit/deny action is the simplest traffic control action. The S7700 controls network
traffic by forwarding or discarding packets.
Re-marking
This traffic control action is used to set the precedence field in a packet. Packets carry
different precedence fields on various networks. For example, packets carry the 802.1p
field in a VLANthe ToS field on an IP network, and the EXP field on an MPLS network.
Therefore, the S7700 is required to mark precedence fields of packets based on the network
type.
Generally, a device at the border of a network needs to mark the precedence fields of
incoming packets; the device at the core of a network provides corresponding QoS services
based on precedence fields marked by the border device, or re-marks the precedence fields
based on its configuration rule.
Redirection
This traffic control action is used to redirect packets to the CPU, the specified interface,
the specified next hop address, or the Label Switching Path (LSP). The S7700 does not
forward packets based on the destination IP address. The S7700 can specify a maximum
of four next hops.
By using redirection, you can implement policy-based routing (PBR). The policy-based
route is a static route. When the next hop is unavailable, the S7700 forwards packets based
on the original forwarding path.
The S7700 can redirect only incoming packets.
Traffic policing
This traffic control action is used to limit the volume of traffic and the resources used by
the traffic by monitoring the rate of the traffic. By using traffic policing, the S7700 can
discard, and re-mark the colors and CoS of packets whose rate exceeds the rate limit.
Here, traffic policing based on traffic classification is implemented. For details about traffic
policing, see 2 Traffic Policing and Traffic Shaping
Flow mirroring
This traffic control action is used to copy the specified data packets to a specified destination
to detect and troubleshoot faults on a network.
For details about flow mirroring, see Mirroring Configuration in the Quidway S7700 Smart
Routing Switch Configuration Guide - Device Management.
Traffic statistics
This traffic control action is used to collect data packets of specified service flows, that is,
data packets matching defined complex traffic classification rules on the S7700.
You can dynamically add, modify, or delete the actions of a traffic behavior on the
S7700.
Disabling Unicast Reverse Path Forward (URPF)
This traffic control action is used to disable URPF check for the flows matching traffic
classification on the S7700
For details about URPF, see Configuring URPF in the Quidway S7700 Smart Routing
Switch Configuration Guide - Security.
Disabling MAC address learning
After MAC address learning is disabled, the S7700 does not learn source MAC addresses
of the packets matching traffic classification rules.
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1 Class-based QoS Configuration
Configuration.
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