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Glossary
IEEE 802.1D
Specifies a general method for the operation of MAC bridges, including the
Spanning Tree Protocol.
IEEE 802.1Q
VLAN Tagging—Defines Ethernet frame tags which carry VLAN information. It
allows switches to assign endstations to different virtual LANs, and defines a
standard way for VLANs to communicate across switched networks.
IEEE 802.1p
An IEEE standard for providing quality of service (QoS) in Ethernet networks. The
standard uses packet tags that define up to eight traffic classes and allows switches
to transmit packets based on the tagged priority value.
IEEE 802.1s
An IEEE standard for the Multiple Spanning Tree Protocol (MSTP) which provides
independent spanning trees for VLAN groups. (Now incorporated in
IEEE 802.1D-2004)
IEEE 802.1w
An IEEE standard for the Rapid Spanning Tree Protocol (RSTP) which reduces the
convergence time for network topology changes to about 10% of that required by the
older IEEE 802.1D STP standard. (Now incorporated in IEEE 802.1D-2004)
IEEE 802.1X
Port Authentication controls access to the switch ports by requiring users to first
enter a user ID and password for authentication.
IEEE 802.3ac
Defines frame extensions for VLAN tagging.
IEEE 802.3x
Defines Ethernet frame start/stop requests and timers used for flow control on
full-duplex links. (Now incorporated in IEEE 802.3-2005)
IGMP Snooping
Listening to IGMP Query and IGMP Report packets transferred between IP Multicast
Routers and IP Multicast host groups to identify IP Multicast group members.
IGMP Query
On each subnetwork, one IGMP-capable device will act as the querier — that is, the
device that asks all hosts to report on the IP multicast groups they wish to join or to
which they already belong. The elected querier will be the device with the lowest IP
address in the subnetwork.
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