3Com SuperStack II 3300 User Manual page 155

Layer 3
Layer 3 switch
link-state routing
link-state
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MAC address
multicast
multicast routing
multicast tunnel
neighbor
nonvolatile data
OSI 7-layer model
The network layer in the OSI 7-layer model. This layer controls
communication links and data routing across one or more links. It
receives data that has been framed by the Data Link layer below it,
converts this data into packets, and passes the result to the Transport
layer that directs the packets to their destination.
A high-performance router that operates at Layer 3 of the OSI 7-layer
model.
In link-state routing, each device maintains a part of a replicated,
distributed database of routing information. Each device monitors the
state of each active link to its local IP networks. All connected devices
collect this local link-state information from all other devices, which
allows them to run a shortest path calculation to determine the best
routes to any given destination network.
The mechanism by which OSPF routing information is exchanged.
The hardware address of a device connected to a shared network
medium.
A message sent to a specific group of nodes on a network
simultaneously.
Multicast routing allows packets to be routed between specific groups
of hosts on different VLANs.
A mechanism by which multicast traffic may be routed through a non-
multicast routing domain. The tunnel is defined by two endpoints
which reside within multicast routing domains, but which connect
through a non-multicast routing domain.
A router's neighbors (or peers) are those routers with which the router
will directly exchange routing information.
Data which is persistent even when the device where the data is stored
is not switched on.
The Open Systems Interconnection model is a 7-layer framework within
which communications protocols and standards have been defined.
G 155
LOSSARY