ohhh no.... the bandwidth statement in the interface is *manually* entered
(defaulted at 1544 Kbit for a serial interface), and is used to calculate:
1. metrics for routing protocols, and
2. bandwidth utilization in the "show interfaces" display
so it's important to have it set correctly.
Some frame relay carriers (Sprint and PacBell come to mind) do not transmit
their CIR, so 'show frame-relay map' doesn't display their CIR.
The frame relay provider does need to be contacted to increase CIR. Higher
CIR usually translates into a cost increase for the circuit.
Here's an explanation of EIR - also see
http://www.nwfusion.com/newsletters/frame/1108fr2.html and
http://www.nwfusion.com/newsletters/frame/1206fr1.html
EIR is the difference between the port speed of the frame relay service and
the CIR. The port speed is set by the frame relay service provider, and may
be lower than the maximum interface speed - for example, on a T-1 circuit,
the provider could provide a 384kbps port and a 128k CIR. In this case, the
EIR = 256k, and it would be wise to set the interface bandwidth to 384k
(bandwidth 384 on the serial interface) to match the port speed. And the
port speed is usually the maximum rate at which one can oversubscribe the
PVC (that is, it is usually the frame relay burst rate)
The moral of the story - just because there is an *access circuit* at a
particular transmission rate does not assure you that you burst at that
rate. The interface is rate-limited to the port speed that was ordered from
the frame relay carrier.
-e-
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: Greg Owens <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Monday, April 09, 2001 6:55 AM
Subject: Re: RE: How to determine CIR and increase CIR of FR?
> Are you sure that information isn't just taken from the "bandwidth"
statements on the subinterfaces?
>
>
> Greg Owens <[EMAIL PROTECTED]> wrote:
> > Sh frame map will show u the CIR
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> Stephen Skinner
> Sent: Monday, April 09, 2001 7:45 AM
> To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
> Subject: Re: How to determine CIR and increase CIR of FR?
>
> your CIR (Committed information rate) is supplied by your SP ...you and
him
> agree how much you can have( depending on how much you pay)
> usually ....the person setting up your router sets the "BANDWIDTH" command
> to the CIR+ BR (burst rate) I.E how high you CAN go up to for a limited
> amount of time ......again your service provider has set this for you
.....
>
> HTH
>
> steve
>
>
> >From: "David Gollop"
> >Reply-To: "David Gollop"
> >To: [EMAIL PROTECTED]
> >Subject: How to determine CIR and increase CIR of FR?
> >Date: Mon, 09 Apr 2001 10:29:40 -0000
> >
> >Hi.. How to determine the CIR of a frame relay line? Like Result shown
> >below, what is the CIR? How do I increase the CIR? Do we have to
contact
> >the Frame relay provider? What is the difference between CIR and EIR??
> >
> >
> >SIN01#sh int s1/1.19
> >Serial1/1.19 is up, line protocol is up
> > Hardware is M4T
> > Description: --- Connects to JKT01 Ser0.2 ---
> > Internet address is 50.200.243.25/30
> > MTU 1500 bytes, BW 2048 Kbit, DLY 20000 usec,
> > reliability 255/255, txload 2/255, rxload 2/255
> > Encapsulation FRAME-RELAY IETF
> >_________________________________________________________________________
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> _________________________________________________________________________
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