272 V6100 and V7122 User GuideVLANS and Multiple IPsMultiple IPsMedia, Control and Management (OAM) traffic in the V7122 can be assigned the same ordifferent IP addresses.For separate IP addresses, the different traffic types are separated into three dedicatednetworks. Instead of a single IP address, the V7122 is assigned three IP addresses andsubnet masks, each relating to a different traffic type. This architecture enables users tointegrate the V7122 into a three-network environment that is focused on security andsegregation. Each entity in the V7122 (e.g., Web, RTP) is mapped to a single traffic type(according to according to Table 59) in which it operates.Alternatively, the V7122 can be assigned two IP addresses for the different traffic types. Forexample, a typical scenario using this mode would include one IP address assigned forControl and OAM, and another IP address assigned for Media.See the following notes: In the current version, a default gateway is only supported for the Media traffic type; forthe other two, use the IP Routing table. In the current version, dual mode supports only a single configuration which separatesthe Media address from the Control and OAM. The IP address and subnet mask used in the Single IP Network mode are carried over tothe OAM traffic type in the Multiple IP Network mode.For detailed information on integrating the V7122 into a VLAN and multiple IPs network, seeGetting Started with VLANS and Multiple IPs. For detailed information on configuring themultiple IP parameters, see Table 42.IEEE 802.1p/Q (VLANs and Priority)The Virtual Local Area Network (VLAN) mechanism enables the V7122 to be integrated intoa 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 itbelongs (media, control or management) (IEEE 802.1Q).The class-of-service mechanism can be utilized to accomplish Ethernet QoS. Packets sentby the V7122 to the Ethernet network are divided into five, different-priority classes (Network,Premium media, Premium control, Gold and Bronze). The priority of each class isdetermined by a corresponding ini file parameter.Traffic type tagging can be used to implement Layer 2 VLAN security. By discriminatingtraffic into separate and independent domains, the information is preserved within the VLAN.Incoming packets received from an incorrect VLAN are discarded.
