System Features - SMC Networks 7824M/VSW - annexe 1 Manual

Management Guide
TigerAccess™ EE
2.1
SMC7824M/VSW

System Features

The following introduces the main features of the VDSL2 system which provides Layer 2
switching, Ethernet switching and related functions.
Virtual Local Area Network (VLAN)
Virtual local area network (VLAN) is made by dividing one network into several logical
networks. Packet cannot be transmitted and received between different VLANs. There-
fore, it can prevent needless packets accumulating and strengthen security. The switch
recognizes 802.1Q tagged frame and supports maximum 4096 VLANs. Port based, Pro-
tocol based, MAC based and Subnet based VLANs are supported in the switch.
Quality of Service (QoS)
For the switch, QoS-based forwarding sorts traffic into a number of classes and marks the
packets accordingly. Thus, different quality of service is provided to each class, which the
packets belong to. The rich QoS capabilities enable network managers to protect mission-
critical applications and support differentiated level of bandwidth for managing traffic con-
gestion. The switch supports ingress and egress (shaping) rate limiting, and different
scheduling type such as SP (Strict Priority) and DWRR (Weighted Deficit Round Robin).
IP Multicast
Because broadcasting in a LAN is restricted if possible, multicasting could be used in-
stead of broadcasting by forwarding multicast packets only to the member hosts who
joined multicast group. The switch provides IGMPv2 and IGMP snooping for host mem-
bership management.
SNMP
Simple network management protocol (SNMP) is to manage Network Elements using
TCP/IP protocol. The switch supports SNMP version 1, 2, 3 and Remote Monitoring
(RMON). Network operator can use MIB also to monitor and manage the switch.
Dynamic Host Configuration Protocol (DHCP)
The switch supports Dynamic Host Configuration Protocol (DHCP) server that automati-
cally assigns IP address to clients accessed to network. That means it has IP address
pool, and operator can effectively utilize limited IP source by leasing temporary IP ad-
dress. In layer 3 network, DHCP request packet can be sent to DHCP server via DHCP
relay and option 82.
Spanning Tree Protocol (STP)
To prevent loop and preserve backup route in Layer 2 network, the switch supports span-
ning tree protocol (STP) defined in IEEE 802.1D. Between STP enabled switches, a root
bridge is automatically selected and the network remains in tree topology. But the recov-
ery time in STP is very slow (about 30 seconds), rapid spanning tree protocol (RSTP) is
also provided. IEEE 802.1w defines the recovery time as 2 seconds. If there is only one
CLI
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