INT-SERV-GUARANTEED-MIB
File:
INT-SERV-GUARANTEED-MIB.mib (8918 bytes)
Imported modules
Imported symbols
Defined Types
IntSrvGuaranteedIfEntry |
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SEQUENCE |
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intSrvGuaranteedIfC |
INTEGER |
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intSrvGuaranteedIfD |
INTEGER |
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intSrvGuaranteedIfSlack |
INTEGER |
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intSrvGuaranteedIfStatus |
RowStatus |
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Defined Values
intSrvGuaranteed |
1.3.6.1.2.1.52.4 |
The MIB module to describe the Guaranteed Service of
the Integrated Services Protocol |
MODULE-IDENTITY |
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intSrvGuaranteedIfEntry |
1.3.6.1.2.1.52.4.1.1.1 |
The reservable attributes of a given inter-
face. |
Status: current |
Access: not-accessible |
OBJECT-TYPE |
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IntSrvGuaranteedIfEntry |
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intSrvGuaranteedIfC |
1.3.6.1.2.1.52.4.1.1.1.1 |
The parameter C is the data backlog resulting
from the vagaries of how a specific implementa-
tion deviates from a strict bit-by-bit service.
So, for instance, for packetized weighted fair
queueing, C is set to the Maximum Packet Size.
The error term C is measured in units of bytes.
An individual element can advertise a C value
between 1 and 2**28 (a little over 250 mega-
bytes) and the total added over all elements
can range as high as (2**32)-1. Should the sum
of the different elements delay exceed
(2**32)-1, the end-to-end error term should be
(2**32)-1. |
Status: current |
Access: read-create |
OBJECT-TYPE |
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INTEGER |
0..0FFFFFFF |
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intSrvGuaranteedIfD |
1.3.6.1.2.1.52.4.1.1.1.2 |
The parameter D at each service element should
be set to the maximum packet transfer delay
(independent of bucket size) through the ser-
vice element. For instance, in a simple
router, one might compute the worst case amount
of time it make take for a datagram to get
through the input interface to the processor,
and how long it would take to get from the pro-
cessor to the outbound interface (assuming the
queueing schemes work correctly). For an Eth-
ernet, it might represent the worst case delay
if the maximum number of collisions is experi-
enced.
The error term D is measured in units of one
microsecond. An individual element can adver-
tise a delay value between 1 and 2**28 (some-
what over two minutes) and the total delay ad-
ded all elements can range as high as (2**32)-
1. Should the sum of the different elements
delay exceed (2**32)-1, the end-to-end delay
should be (2**32)-1. |
Status: current |
Access: read-create |
OBJECT-TYPE |
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INTEGER |
0..0FFFFFFF |
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intSrvGuaranteedIfSlack |
1.3.6.1.2.1.52.4.1.1.1.3 |
If a network element uses a certain amount of
slack, Si, to reduce the amount of resources
that it has reserved for a particular flow, i,
the value Si should be stored at the network
element. Subsequently, if reservation re-
freshes are received for flow i, the network
element must use the same slack Si without any
further computation. This guarantees consisten-
cy in the reservation process.
As an example for the use of the slack term,
consider the case where the required end-to-end
delay, Dreq, is larger than the maximum delay
of the fluid flow system. The latter is ob-
tained by setting R=r in the fluid delay formu-
la, and is given by
b/r + Ctot/r + Dtot.
In this case the slack term is
S = Dreq - (b/r + Ctot/r + Dtot).
The slack term may be used by the network ele-
ments to adjust their local reservations, so
that they can admit flows that would otherwise
have been rejected. A service element at an in-
termediate network element that can internally
differentiate between delay and rate guarantees
can now take advantage of this information to
lower the amount of resources allocated to this
flow. For example, by taking an amount of slack
s <= S, an RCSD scheduler [5] can increase the
local delay bound, d, assigned to the flow, to
d+s. Given an RSpec, (Rin, Sin), it would do so
by setting Rout = Rin and Sout = Sin - s.
Similarly, a network element using a WFQ
scheduler can decrease its local reservation
from Rin to Rout by using some of the slack in
the RSpec. This can be accomplished by using
the transformation rules given in the previous
section, that ensure that the reduced reserva-
tion level will not increase the overall end-
to-end delay. |
Status: current |
Access: read-create |
OBJECT-TYPE |
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INTEGER |
0..0FFFFFFF |
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intSrvGuaranteedIfStatus |
1.3.6.1.2.1.52.4.1.1.1.4 |
'valid' on interfaces that are configured for
the Guaranteed Service. |
Status: current |
Access: read-create |
OBJECT-TYPE |
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RowStatus |
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intSrvGuaranteedIfAttribGroup |
1.3.6.1.2.1.52.4.3.1.2 |
These objects are required for Systems sup-
porting the Guaranteed Service of the Integrat-
ed Services Architecture. |
Status: current |
Access: read-create |
OBJECT-GROUP |
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