Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) - Manual (Page 2203)

Appendix B: Glossary
Software Reference for x310 Series Switches
C613-50046-01 REV A AlliedWare Plus TM Operating System - Version 5.4.4C B.13
ICMPv6
Internet Control Message Protocol Version 6. ICMPv6 is an implementation of ICMP for
IPv6.
For more information see “The Internet Control Message Protocol (ICMPv6)” on
page 26.7 .
IGMP
Internet Group Management Protocol. IGMP is a communications protocol that hosts use
to indicate that they are interested in receiving a particular multicast stream.
IGMP querier or router
A device in a subnetwork that is the coordinator for all multicast streams and IGMP
membership information. Each subnet only has one active querier.
IGMP snooper
A device that spies on IGMP messages to create flow efficiencies by ensuring that
multicast data streams are only sent to interested ports. A snooper can decide on the best
path to send multicast packets at Layer 2 but does not initiate any IGMP communications.
For a configuration example see “IGMP Snooping and Querier configuration example”
on page 30.5 .
Ingress
Incoming packet process.
IP directed broadcast
An IP directed broadcast is an IP packet whose destination address is a broadcast address
for some IP subnet, but originates from a node that is not itself part of that destination
subnet. When a directed broadcast packet reaches a switch that is directly connected to
its destination subnet, the packet is flooded as a broadcast on the destination subnet. IP
directed broadcast is enabled and disabled per VLAN interface. When enabled a directed
broadcast packet is forwarded to an enabled VLAN interface if received on another
subnet.
IP Helper
The IP Helper feature allows the switch to receive UDP broadcasts on one subnet, and
forward them as broadcasts or unicasts into another subnet, so a client can use an
application which uses UDP broadcast (such as Net-BIOS) when the client and server are
located in different subnets. The IP Helper feature forwards UDP broadcast network traffic
to specific hosts on another subnet and/or to the broadcast address of another subnet.
When the IP Helper feature is enabled on a VLAN interface, the UDP broadcast packets
received on the interface are processed for forwarding out through another interface into
another subnet.
I-SID
Extended Service ID.
ISP
Internet Service Provider. An organization that offers its customers access to the Internet.
The ISP connects its customers using a data transmission technology, such as dial-up or
DSL etc.