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Resource ReSerVation Protocol API (RAPI)
Copyright © 1998 The Open Group
Glossary
The reader is advised to consult
the current list of Internet Official
Protocol Standards (IETF Std 1)
for the status of the RFCs listed
below, and to review any RFCs
that supersede them.
The reader may also want to check
Internet Drafts in relevant IETF
working groups for the latest
developments.
See reference
RFC 2205
for a more extensive glossary of RSVP terms.
Adspec
A data element (object) in a
Path message that carries a package of
OPWA advertising information.
See "One Pass With Advertising ".
AH
Abbreviation for IP "Authentication Header".
See reference
RFC 1826.
API
Application Programming Interface
C-type
A sub-identifier within an object class.
A class identifier and C-type together
uniquely identify an RSVP object.
Controlled-Load service
An integrated service that provides a
quality of service that closely resembles to "best effort"
service under unloaded conditions.
See reference
RFC 2211.
Error term C
The rate-dependent error term of the flow in
a network element. It represents the
delay a datagram in the flow might incur in a
network element that can be directly attributed
to the rate parameters of the flow. The error
term C is measured in units of bytes.
Error term Csum
The cumulative sum of the error terms C of the
flow since the most recent reshaping point upstream
from the receiver. See reference
RFC 2212.
Error term Ctot
The end-to-end sum of the error terms C of the
flow. See reference
RFC 2212.
Error term D
The rate-independent term of the flow in a
network element. It represents the worst case
non-rate-based transit delay through the network element. The
error term D is measured in units of microseconds.
Error term Dsum
The cumulative sum of the error terms D of the
flow since the most recent reshaping point upstream
from the receiver. See reference
RFC 2212.
Error term Dtot
The end-to-end sum of the error terms D of the
flow. See reference
RFC 2212.
ESP
Abbreviation for IP "Encapsulation Security
Payload". See reference
RFC 1827.
Filter Spec
Together with the session information, defines
the set of data packets to receive the QoS
specified in a flowspec. The filter spec is used
to set parameters in the packet classifier function.
Flow
The set of data packets defined by a session specification
together with a Filter Spec.
Flow descriptor
The combination of a flowspec and a filter spec.
Flowspec
Defines the QoS to be provided for a flow.
The flowspec is used to set parameters in the
packet scheduling function to provide
the requested quality of service.
Guaranteed service
An integrated service that guarantees both bandwidth
and firm end-to-end delay bounds. See reference
RFC 2212.
GPI
Abbreviation for "Generalized Port Identifier".
When it is used in the context of IP Security,
it refers to the Security Parameter Index, or
SPI. See reference
RFC 2207.
IETF
Internet Engineering Task Force
INTSERV
Integrated Services
IP
Internet Protocol, version 4 (IPv4, see reference
RFC 791)
is in current use at the time of publication of
this Technical Standard.
Version 6 (IPv6) is the "new generation" Internet Protocol
being specified by the IETF to replace IPv4.
IPSEC
Abbreviation for IP Security Protocol.
See reference
RFC 1825.
ISI
Information Sciences Institute of the School of Engineering
at the University of Southern California
Minimum policed unit
The size in bytes of the smallest packet in the
flow. The packet size includes the application data
and all protocol headers at or above the IP level.
This is used by network elements to compute maximum
bandwidth overhead needed to carry a flow's packets
over a particular link technology.
One Pass With Advertising (OPWA)
Describes a reservation setup model in
which (Path) messages sent downstream
gather information that the receiver(s) can
use to predict the end-to-end service.
The information that is gathered is called
an advertisement. See also "Adspec".
OPWA
Abbreviation for "One Pass With Advertising".
Override
A flag indicating whether the general path
characterization parameters are overridden
by parameters specific to a given QoS service.
A non-zero value will indicate at least one
of the general path characterization parameters
is to be overridden.
Peak data rate
Sender's peak traffic generation rate if it is
known and controlled. It may be set to the
sender's outgoing interface link rate if it is
known, or it may be set to positive infinity if no
better value is available.
QoS
Quality of Service.
RAPI
RSVP API
RAPI Session
A RAPI session is an API session created by
a call to
rapi_session()
and terminated by a
call to
rapi_release().
Rspec
The component of a flowspec that defines a desired QoS.
RSVP
Resource ReSerVation Protocol
RSVP Session
An RSVP session defines one simplex unicast
or multicast data flow for which reservations
are required. An RSVP session is identified by
the destination address, transport-layer
protocol, and an optional (generalized)
destination port.
Session
See "RAPI Session" and "RSVP Session".
Slack term
The delay delta between the desired delay and the
delay that can be obtained by using a reservation
bandwidth level R as specified in the Rspec. The
slack term is measured in units of microseconds.
See reference
RFC 2212.
Token bucket depth
Size of an abstract linear first-in-first-out
buffer for holding a sender's data before
the data is transmitted. The token bucket
depth is one of the several parameters used
to define the traffic specification of a data
flow. See reference
RFC 2211,
and reference
RFC 2212.
Token bucket rate
The average data rate that a sender will be
sending into the flow. The token bucket rate
is measured in bytes of IP datagrams per second.
The IP header and any other upper layer protocol
header are included in this measurement.
TSpec
A traffic parameter set that describes a flow.
TTL
An abbreviation for the IP "Time to Live" field.
This one-octet field in the IP protocol header
controls the maximum distance the payload datagram
can be forwarded. The implication of time is
historical; in the current Internet, the TTL field
is simply a count of hops the datagram may travel
before being discarded.
vDstPort
Abbreviation for "Virtual Destination Port".
It is used to de-multiplex RSVP sessions beyond
the IP destination address for IPSEC flows.
See reference
RFC 2207.