Installation manual

CHAPTER 4. Functions of OfficeServ 7400

4-10

Multicast Routing

y Internet Group Management Protocol (IGMP)

Internet Group Management Protocol (IGMP) is a protocol that manages the multicast

group operating at one Ethernet segment. It controls the segment so that a user can

subscribe or secede as a member of the specific multicast group.

y Distance Vector Multicast Routing Protocol (DVMRP)

Distance Vector Multicast Routing Protocol (DVMRP) is a protocol for supporting the

transmission of the multicast data in a network. This protocol sends the multicast data in

a format of unicast packet, and the packets are reassembled into multicast data at the

destination. DVMRP can be operated in various formats of networks including Ethernet,

and even can be operated via the routers that the multicast is not supported with.

y Protocol Independent Multicast-Sparse Mode (PIM-SM)

PIM-SM is designed in order to route multicast packets into multicast groups and in

order to construct the allocation tree efficiently at WAN, by which is optimized in the

environment where the data stream occur in many places.

Routing between VLAN Groups

The communication between the VLAN groups through the routing between the VLAN

groups.

HTBQ/Bandwidth on Demand (BoD)

The queuing process is differentially performed according to the level table where the

routing process priority for a data server is defined.

RTP Priority

The RTP (Real-Time Transport Protocol) packet is a VoIP media packet. The queuing

process for the RTP packet is prior to that for other data pack, which helps to maintain the

tone quality. This function is useful when using the VoIP function in the network where the

VoIP packet that should be processed in real time and other packets for the general office

work are mixed processed.

IP-ToS Process

This function checks the ToS (Type of Service) field of the IP header and processes it

according to priority of the corresponding routing in the data server.

This function reproduces the ToS field flowing into the data server, performs the routing

process first of all, and heightens the process priority in the next HOP.