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Dimension
5.3 IGMP Snooping
Traditionally, IP packets are transmitted in one of either two ways - Unicast (1 sender to 1 recipient) or Broadcast (1 sender to everybody on the network). Multicast delivers IP packets to just a group of hosts on the network.
IGMP (Internet Group Multicast Protocol) is a
A
Without IGMP snooping, multicast traffic is treated in the same manner as broadcast traffic, that is, it is forwarded to all ports. With IGMP snooping, group multicast traffic is only forwarded to ports that are members of that group. IGMP Snooping generates no additional network traffic, allowing you to significantly reduce multicast traffic passing through your switch.
5.4 Introduction to VLANs
A VLAN (Virtual Local Area Network) allows a physical network to be partitioned into multiple logical networks. Stations on a logical network belong to one group. A station can belong to more than one group. With VLAN, a station cannot directly talk to or hear from stations that are not in the same group(s); the traffic must first go through a router.
In MTU
VLAN also increases network performance by limiting broadcasts to a smaller and more manageable logical broadcast domain. In traditional switched environments, all broadcast packets go to each and every individual port. With VLAN, all broadcasts are confined to a specific broadcast domain.
Note that VLAN is unidirectional; it only governs outgoing traffic.
See the VLAN Setup chapter for information on
5.5 Introduction to Spanning Tree Protocol (STP)
STP detects and breaks network loops and provides backup links between switches, bridges or routers. It allows a switch to interact with other
5.5.1STP Terminology
The root bridge is the base of the spanning tree; it is the bridge with the lowest identifier value (MAC address).
General, Switch and IP Setup |