245
depending on the capabilities of the attached device. Up to 30 Watts
can be delivered through each port when using all four pairs.
IEEE 802.3u Defines CSMA/CD access method and physical layer specifications for
100BASE-TX and 100BASE-FX Fast Ethernet. (Now incorporated in IEEE
802.3-2005.)
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 can 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 is the device with the lowest IP address in the
subnetwork.
Internet Control
Message Protocol
(ICMP)
A network layer protocol that reports errors in processing IP packets.
ICMP is also used by routers to feed back information about better
routing choices.
Internet Group
Management
Protocol (IGMP)
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.
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.
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