Policing And Shaping; Provisioning Qos Networks Using Advanced Filters - Avaya 8800 Planning And Engineering, Network Design

QoS design guidelines
5. Set the desired precedence, traffic type, and action.
The traffic type is determined when you create an ingress or egress ACL.
6. Modify the fields for the ACE.

Policing and shaping

As part of the filtering process, the administrator or service provider can police ingress traffic.
Policing is performed according to the traffic filter profile assigned to the traffic flow. For enterprise
networks, policing is required to ensure that traffic flows conform to the criteria assigned by network
managers.
Both traffic policers and traffic shapers identify traffic using a traffic policy. Traffic that conforms to
this policy is guaranteed for transmission, whereas nonconforming traffic is considered to be in
violation. Traffic policers drop packets when traffic is excessive, or remark the DSCP or 802.1p
markings by using filter actions. With the Avaya Ethernet Routing Switch 8800/8600, you can define
multiple actions in case of traffic violation.
For service providers, policing at the network edge provides different bandwidth options as part of a
Service Level Agreement (SLA). For example, in an enterprise network, you can police the traffic
rate from one department to give critical traffic unlimited access to the network. In a service provider
network, you can control the amount of traffic customers send to ensure that they comply with their
SLA. Policing ensures that users do not exceed their traffic contract for any given QoS level.
Policing (or rate metering) gives the administrator the ability to limit the amount of traffic for a
specific user in two ways:
• drop out-of-profile traffic
• remark out-of-profile traffic to a lower (or higher) QoS level when port congestion occurs
Rate metering can only be performed on a Layer 3 basis.
Traffic shapers buffer and delay violating traffic. These operations occur at the egress queue set
level. The Ethernet Routing Switch 8800/8600 supports traffic shaping at the port level and at the
per-transmit-queue level for outgoing traffic.

Provisioning QoS networks using Advanced filters

You can use Advanced filters (ACLs) to provision the network.
When you configure Access Control Templates (ACT), only define the attributes on which to match if
they are absolutely required. Use as few attributes as possible. The more attributes you configure,
the more resource-intensive the filtering action is. If too many attributes are defined, you may
receive error messages about using up memory.
June 2016 Planning and Engineering — Network Design
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