From: Connary, Julie Ann (jconnary@xxxxxxxxx)
Date: Tue Dec 26 2000 - 18:40:55 GMT-3
Hi All,
I am working on a lab that calls for frame-relay traffic shaping and rsvp.
My question is that when fair queing is enabled, the solution says:
fair-queue 64 256 1000
Does this not set up 1000 rsvp queues ( fair-queue
[congestive-discard-threshold[dynamic-queues[reservable-queues]]]] and why
would I need that many? Or am I misenterpreting the 1000?
Also what experience do people have using frame-relay traffic shaping with
map-classes vs. using the
traffic-shape rate command directly under the interface ( (From the command
reference for 12.0)?
------------------------------------------------
traffic-shape rate
To enable traffic shaping for outbound traffic on an interface, use the
traffic-shape rate interface configuration command. To disable traffic
shaping on the interface,
use the no form of this command.
traffic-shape rate bit-rate [burst-size [excess-burst-size]]
no traffic-shape rate
Syntax Description
bit-rate
Bit rate that traffic is shaped to in bits per second. This
is the access bit rate that you contract with your service provider, or the
service levels you intend to
maintain.
burst-size
(Optional) Sustained number of bits that can be transmitted
per interval. On Frame Relay interfaces, this is the committed burst size
contracted with your service
provider.
excess-burst-size
(Optional) Maximum number of bits that can exceed the burst
size in the first interval in a congestion event. On Frame Relay
interfaces, this is the excess burst size
contracted with your service provider. The default is equal
to the burst-size.
Default
Traffic shaping is disabled.
Command Mode
Interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.2.
Note Traffic shaping is not supported with optimum, distributed, or flow
switching. If you enable this command, all interfaces will revert to fast
switching:
Traffic shaping uses queues to limit surges that can congest a network.
Data is buffered and then sent into the network in regulated amounts to
ensure that traffic will
fit within the promised traffic envelope for the particular connection.
Use traffic shaping if you have a network with differing access rates or if
you are offering a subrate service. You can configure the values according
to your contract
with your service provider or the service levels you intend to maintain.
An interval is calculated as follows:
If the burst-size is not equal to zero, the interval is the
burst-size divided by the bit-rate.
If the burst-size is zero, the interval is the excess-burst-size
divided by the bit-rate.
Traffic shaping is supported on all media and encapsulation types on the
router. To perform traffic shaping on Frame Relay virtual circuits, you can
also use the
frame-relay traffic-shaping command. For more information on Frame Relay
traffic shaping, refer to the "Configuring Frame Relay" chapter in the
Wide-Area
Network Configuration Guide.
------------------------------------------------------------
Thanks,
Julie Ann
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Julie Ann Connary
| | Network Consulting Engineer
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Herndon VA 20171
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c i s c o S y s t e m s Email: jconnary@cisco.com
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