AudioCodes Mediapack mp-11x, User Manual

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Version 5.2 373 August 2007
SIP User's Manual 8. Networking Capabilities
In Dual IP mode, thegateway is assigned two IP addresses for the different traffic
types. One IP address is assigned with a combination of two traffic types (Media and
Control, OAM and Control, or OAM and Media), while the other IP address is assigned
to whichever traffic type not included in this combination. For example, a typical
scenario using this mode would include one IP address assigned for Control and
OAM, and another IP address assigned for Media.
Notes:
•
A default Gateway is supported only for the Media traffic type; for the
other two, use the IP Routing table.
•
The IP address and subnet mask used in the Single IP Network mode
are carried over to the OAM traffic type in the Multiple IP Network mode.
For detailed information on integrating the gateway into a VLAN and multiple IPs network,
refer to 'Getting Started with VLANS and Multiple IPs' on page
375 . For detailed
information on configuring the multiple IP parameters, refer to 'Networking Parameters' on
page
256 .
8.9.2 IEEE 802.1p/Q (VLANs and Priority)
The Virtual Local Area Network (VLAN) mechanism enables the gateway to be integrated
into a VLAN-aware environment that includes switches, routers and endpoints.
When in VLAN-enabled mode, each packet is tagged with values that specify its priority
(class-of-service) (IEEE 802.1p) and the identifier (traffic type) of the VLAN to which it
belongs (media, control, or management) (IEEE 802.1Q).
The class-of-service mechanism can be utilized to accomplish Ethernet QoS. Packets sent
by the gateway to the Ethernet network are divided into five, different-priority classes
(Network, Premium media, Premium control, Gold, and Bronze). The priority of each class
is determined by a corresponding
ini
file parameter.
Traffic type tagging can be used to implement Layer 2 VLAN security. By discriminating
traffic into separate and independent domains, the information is preserved within the
VLAN. Incoming packets received from an incorrect VLAN are discarded.
Media traffic type is assigned ‘Premium media’ class of service, Management traffic type is
assigned ‘Bronze’ class of service, and Control traffic type is assigned ‘Premium control’
class of service. For example, RTP/RTCP traffic is assigned the Media VLAN ID and
‘Premium media’ class of service, whereas Web traffic is assigned the Management VLAN
ID and ‘Bronze’ class of service. Each of these parameters can be configured with a
802.1p/q value: traffic type to VLAN ID, and class of service to 802.1p priority.
Notes:
•
As a safety measure, the VLAN mechanism is activated only when the
gateway is loaded from the flash memory. Therefore, when using BootP:
Load an
ini
file with VlanMode set to 1 and SaveConfiguration set to 1.
Then (after the gateway is active) reset the gateway with TFTP disabled
or by using any method except for BootP.
•
The gateway must be connected to a VLAN-aware switch, and the
switch’s PVID must be equal to the gateway’s native VLAN ID.