Glossary
ExtremeWare XOS 11.3 Concepts Guide
660
OSI reference model
The 7-layer standard model for network architecture is the basis for
defining network protocol standards and the way that data passes
through the network. Each layer specifies particular network
functions; the highest layer is closest to the user, and the lowest layer
is closest to the media carrying the information. So, in a given message
between users, there will be a flow of data through each layer at one
end down through the layers in that computer and, at the other end,
when the message arrives, another flow of data up through the layers
in the receiving computer and ultimately to the end user or program.
This model is used worldwide for teaching and implementing
networking protocols.
OSPF
Open Shortest Path First. This is an IGP. OSPF, a routing protocol for
TCP/IP networks, uses a link state routing algorithm that calculates
routes for packets based on a number of factors, including least hops,
speed of transmission lines, and congestion delays. You can also
configure certain cost metrics for the algorithm. This protocol is more
efficient and scalable than vector-distance routing protocols. OSPF
features include least-cost routing, ECMP routing, and load balancing.
Although OSPF requires CPU power and memory space, it results in
smaller, less frequent router table updates throughout the network.
This protocol is more efficient and scalable than vector-distance
routing protocols.
OSPFv3
OSPFv3 is one of the routing protocols used with IPV6 and is similar
to OSPF.
P
packet
This is the unit of data sent across a network. Packet is a generic term
used to describe units of data at all levels of the protocol stack, but it
is most correctly used to describe application data units. The packet is
a group of bits, including data and control signals, arranged in a
specific format. It usually includes a header, with source and
destination data, and user data. The specific structure of the packet
depends on the protocol used.
partner node
In EAPS, the partner node is that end of the common link that is
not
a
controller node; the partner node does not participate in any form of
blocking.
PD
Powered device. In PoE, the PD is the powered device that plugs into
the PoE switch.
PDU
Protocol data unit. A PDU is a message of a given protocol comprising
payload and protocol-specific control information, typically contained
in a header.
PIM-DM
Protocol-Independent Multicast - Dense mode. PIM-DM is a multicast
protocol that uses Reverse Path Forwarding but does not require any
particular unicast protocol. It is used when recipients are in a
concentrated area.
O (Continued)
Содержание ExtremeWare XOS 11.3
Страница 20: ...Contents ExtremeWare XOS 11 3 Concepts Guide 20...
Страница 25: ...1 Using ExtremeWare XOS...
Страница 26: ......
Страница 38: ...ExtremeWare XOS Overview ExtremeWare XOS 11 3 Concepts Guide 38...
Страница 58: ...Accessing the Switch ExtremeWare XOS 11 3 Concepts Guide 58...
Страница 146: ...Configuring Slots and Ports on a Switch ExtremeWare XOS 11 3 Concepts Guide 146...
Страница 218: ...Status Monitoring and Statistics ExtremeWare XOS 11 3 Concepts Guide 218...
Страница 240: ...Virtual LANs ExtremeWare XOS 11 3 Concepts Guide 240...
Страница 248: ...Virtual Routers ExtremeWare XOS 11 3 Concepts Guide 248...
Страница 278: ...Access Lists ACLs ExtremeWare XOS 11 3 Concepts Guide 278...
Страница 288: ...Routing Policies ExtremeWare XOS 11 3 Concepts Guide 288 entry deny_rest if then deny...
Страница 344: ...Security ExtremeWare XOS 11 3 Concepts Guide 344...
Страница 393: ...2 Using Switching and Routing Protocols...
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Страница 454: ...Spanning Tree Protocol ExtremeWare XOS 11 3 Concepts Guide 454...
Страница 484: ...Extreme Standby Router Protocol ExtremeWare XOS 11 3 Concepts Guide 484...
Страница 514: ...IPv4 Unicast Routing ExtremeWare XOS 11 3 Concepts Guide 514...
Страница 530: ...IPv6 Unicast Routing ExtremeWare XOS 11 3 Concepts Guide 530...
Страница 538: ...RIP ExtremeWare XOS 11 3 Concepts Guide 538...
Страница 556: ...OSPF ExtremeWare XOS 11 3 Concepts Guide 556...
Страница 566: ...OSPFv3 ExtremeWare XOS 11 3 Concepts Guide 566...
Страница 589: ...3 Appendixes...
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Страница 640: ...CNA Agent ExtremeWare XOS 11 3 Concepts Guide 640...
Страница 670: ...Glossary ExtremeWare XOS 11 3 Concepts Guide 670...
Страница 698: ...Index ExtremeWare XOS 11 3 Concepts Guide 698...