Motorola EX-3524 Cli Reference Manual page 598

Glossary
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 Proxy
Proxies multicast group membership information onto the upstream interface based on
IGMP messages monitored on downstream interfaces, and forwards multicast traffic based
on that information. There is no need for multicast routing protocols in an simple tree that
uses IGMP Proxy.
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.
IP Precedence
The Type of Service (ToS) octet in the IPv4 header includes three precedence bits defining
eight different priority levels ranging from highest priority for network control packets to
lowest priority for routine traffic. The eight values are mapped one-to-one to the Class of
Service categories by default, but may be configured differently to suit the requirements for
specific network applications.
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.
– 598 –