ZyXEL VLC1324G Manual do Utilizador descarregar pdf (Página 18)

Chapter 1 VLC Overview

VLC1324G User’s Guide

Static Multicast

Use static multicast to allow incoming frames based on multicast MAC address(es) that you

specify. This feature can be used in conjunction with IGMP snooping to allow multicast MAC

address(es) that are not learned by IGMP snooping. You can use static multicast to pass

routing protocols, such as RIP and OSPF.

Multicast VLAN

Multicast VLAN is designed for applications (such as Media-on-Demand (MoD)) using

multicast traffic across an Ethernet ring-based service provider network. Multicast VLAN

allows one single multicast VLAN to be shared among different subscriber VLANs on the

network. This improves bandwidth utilization by reducing multicast traffic in the subscriber

VLANs and simplifies multicast group management.

Multicast Bandwidth Control

The VLC supports static bandwidth control for multicast traffic. Bandwidth limits can be

assigned to multicast channels. During IGMP snooping, the system checks the total bandwidth

usage to see if it exceeds the specified limit. If the specified limits are reached, the system

restricts the joining of multicast groups on a per port basis.

DHCP Relay

DHCP (Dynamic Host Configuration Protocol RFC 2131 and RFC 2132) allows individual

computers to obtain TCP/IP configuration at start-up from a server. You can configure the

system as a DHCP relay agent to have another DHCP server provide TCP/IP configuration for

the clients. In addition, you can set the system to forward client DHCP requests to specific

DHCP servers based on the VLAN ID. You can also specify up to two DHCP servers for each

VLAN to provide failover protection.

Rate Limiting

Rate limiting on the subscriber ports allows service providers to offer tiered service in

increments of 64 Kbps. This service differentiation is not only to fulfill the needs of different

customers, but also to provide a network infrastructure that combines guaranteed performance

and flexibility in service provisioning.

DHCP Relay Option 82

The system supports DHCP relay agent82 (RFC 3046) that adds additional information to

client DHCP requests that the MSC relays to a DHCP server. It also supports adding the sub-

option 2 (Remote ID) with additional information.

PPPoE Intermediate Agent Information

Similar to DHCP relay option82, you can set the system to insert line information into client

PPPoE Active Discovery Initialization (PADI), PPPoE Active Discovery Request (PADR),

and upstream PPPoE Active Discovery Terminate (PADT) packets. This allows a PPPoE

termination server to identify and authenticate a PPPoE client.

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