Configuring Diffserv-To-Vlan Priority Mapping - AudioCodes Mediant 800B User Manual

Parameter
Gold QoS
gold-qos
[GoldServiceClassDiffServ]
Bronze QoS
bronze-qos
[BronzeServiceClassDiffServ]

12.9.2 Configuring DiffServ-to-VLAN Priority Mapping

The QoS Mapping table lets you configure up to 64 DiffServ-to-VLAN priority mapping for
Layer 3 and Layer-2 Quality of Service (QoS). For each packet sent to the LAN, the VLAN
Priority of the packet is set according to the DiffServ value in the IP header of the packet.
Layer-2 802.1Q frames have a 2-byte field called Tag Control Information. The three most
significant bits of this 2-byte field represents the Class of Service (CoS) value. Layer-2 QoS
is represented by this CoS value which is from 0 to 7 (thus 8 values). Layer-2 QoS
parameters define the values for the 3 priority bits in the VLAN tag according to the value
of the DiffServ field in the packet IP header (according to the IEEE 802.1p standard).
Differentiated Services (DiffServ) is an architecture providing different types or levels of
service for IP traffic. DiffServ (according to RFC 2474), prioritizes certain traffic types
based on priority, accomplishing a higher-level QoS at the expense of other traffic types.
By prioritizing packets, DiffServ routers can minimize transmission delays for time-sensitive
packets such as VoIP packets.
The following procedure describes how to configure DiffServ-to-VLAN priority mapping
through the Web interface. You can also configure it through ini file (DiffServToVlanPriority)
or CLI (configure network > qos vlan-mapping).

To configure DiffServ-to-VLAN priority mapping:
1. Open the QoS Mapping table (Setup menu > IP Network tab > Quality folder > QoS
Mapping).
2. Click New; the following dialog box appears:
3. Configure a DiffServ-to-VLAN priority mapping rule according to the parameters
described in the table below.
4. Click Apply, and then save your settings to flash memory.
User's Manual
Profile (IpProfile_SigIPDiffServ) or Tel Profile
(TelProfile_SigIPDiffServ).
Defines the DiffServ value for Gold CoS content (streaming
applications).
The valid range is 0 to 63. The default is 26.
Defines the DiffServ value for Bronze CoS content (OAMP
applications).
The valid range is 0 to 63. The default is 10.
Figure 12-12: QoS Mapping Table - Add Dialog Box
Mediant 800B Gateway & E-SBC
Description
168 Document #: LTRT-10632