ExtremeWare XOS 11.3 Concepts Guide
653
H
HA Host Attach. In ExtremeWare XOS software, HA is part of ESRP that
allows you to connect active hosts directly to an ESRP switch; it allows
configured ports to continue Layer 2 forwarding regardless of their
ESRP status.
half-duplex This is the communication mode in which a device can either send or
receive data, but not simultaneously. (Devices at 1 Gbps or higher do
not run in half-duplex mode; they run only in full-duplex mode.)
header This is control information (such as originating and destination
stations, priority, error checking, and so forth) added in front of the
data when encapsulating the data for network transmission.
hitless failover In the Extreme Networks implementation on modular switches, hitless
failover means that designated configurations survive a change of
primacy between the two MSMs with all details intact. Thus, those
features run seamlessly during and after control of the system changes
from one MSM to another.
I
IBGP Interior Border Gateway Protocol. IBGP is the BGP version used
within an AS.
ICMP Internet Control Message Protocol. ICMP is the part of the TCP/IP
protocol that allows generation of error messages, test packets, and
operating messages. For example, the ping command allows you to
send ICMP echo messages to a remote IP device to test for
connectivity. ICMP also supports traceroute, which identifies
intermediate hops between a given source and destination.
IEEE Institute of Electrical and Electronic Engineers. This technical
professional society fosters the development of standards that often
become national and international standards. The organization
publishes a number of journals and has many local chapters and
several large societies in special areas.
IETF Internet Engineering Task Force. The IETF is a large, open,
international community of network designers, operators, vendors,
and researchers concerned with the evolution of the Internet
architecture and the smooth operation of the Internet. The technical
work of the IETF is done in working groups, which are organized by
topic.
IGMP Internet Group Management Protocol. Hosts use IGMP to inform local
routers of their membership in multicast groups. Multicasting allows
one computer on the Internet to send content to multiple other
computers that have identified themselves as interested in receiving
the originating computer's content. When all hosts leave a group, the
router no longer forwards packets that arrive for the multicast group.
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