User manual

G LOSSARY
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ES-2000 Series
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 802.3-2002)
IGMP Internet Group Management Protocol. A protocol through which hosts can
register with their local router for multicast services. If there is more than
one multicast switch/router on a given subnetwork, one of the devices is
made the “querier” and assumes responsibility for keeping track of group
membership.
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.
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.
IN-BAND MANAGEMENT Management of the network from a station attached directly to the
network.
IP MULTICAST FILTERING A process whereby this switch can pass multicast traffic along to
participating hosts.
LACP Link Aggregation Control Protocol. Allows ports to automatically negotiate
a trunked link with LACP-configured ports on another device.
LAYER 2 Data Link layer in the ISO 7-Layer Data Communications Protocol. This is
related directly to the hardware interface for network devices and passes
on traffic based on MAC addresses.
LINK AGGREGATION See Port Trunk.
LLDP Link Layer Discovery Protocol is used to discover basic information about
neighboring devices in the local broadcast domain by using periodic
broadcasts to advertise information such as device identification,
capabilities and configuration settings.