Edge-Core ECS4110-28T, Руководство по управлению, Страница: 1488 / 1514

G
LOSSARY
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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 802.3
AC
Defines frame extensions for VLAN tagging.
IEEE 802.3
X
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 Q
UERY
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 P
ROXY
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 S
NOOPING
Listening to IGMP Query and IGMP Report packets transferred between IP
Multicast Routers and IP Multicast host groups to identify IP Multicast
group members.
I
N
-B
AND
M
ANAGEMENT
Management of the network from a station attached directly to the
network.
IP M
ULTICAST
F
ILTERING
A process whereby this switch can pass multicast traffic along to
participating hosts.
IP P
RECEDENCE
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.