From: ChrisH (chrish@xxxxxxxx)
Date: Tue Dec 26 2000 - 23:30:31 GMT-3
Julie Ann was correct. These configurable parameters are congestive discard
threshold, the number of conversation or flow queues available, and the
number of queues which may be reserved by RSVP. Therefore, the 64 means that
64 packets may be queued in each flow's queue. The default is 64. The number
of conversation queues available, which is 256 also is the default here,
controls how many different conversations the router will monitor. The
number of queues available for RSVP, 1000 here, places a limit on how many
reservations the WFQ engine will support. The default value for WFQ is 0.
However, enabling RSVP automatically configures WFQ to reserve 1000 queues
for RSVP. These values are more than adequate for almost all applications.
Hope this helps!
Chris
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
D. J. Jones
Sent: Tuesday, December 26, 2000 6:10 PM
To: Connary, Julie Ann; ccielab@groupstudy.com
Subject: Re: frame relay traffic shaping and rsvp
Julie Ann,
I think what the fair-queue 64 256 1000 statement is saying is that you will
have 64 allowed messages in each queue, 256 dynamic queues to be used for
best effort conversations and a maximum buffer size of 1000 bytes.
The number of reserved queues which you may be thinking of only has a range
from 0 to 100 and a default value of 2. If you were to use all of the
optional parms, then your statement would read:
fair-queue 64 16 2 600
If someone else reads this differently, please let me know..dj
Here is a reference URL
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/wan_
r/wrdfrely.htm#37411
----- Original Message -----
From: "Connary, Julie Ann" <jconnary@cisco.com>
To: <ccielab@groupstudy.com>
Sent: Tuesday, December 26, 2000 1:40 PM
Subject: frame relay traffic shaping and rsvp
> 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
> ------------------------------------------------------------------------
> Julie Ann Connary
> | | Network Consulting Engineer
> ||| ||| Federal Support Program
> .|||||. .|||||. 13635 Dulles Technology Drive,
> Herndon VA 20171
> .:|||||||||:.:|||||||||:. Pager: 1-888-642-0551
> c i s c o S y s t e m s Email: jconnary@cisco.com
>
> ------------------------------------------------------------------------
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 08:26:10 GMT-3