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Posted by Merv on April 29, 2008, 5:51 pm
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> Hi,
>
> I'm having a bit of trouble in getting the full bandwith on an IPoATM
> connecion ( ADSL w/ LLC encapsulation)
>
> I've setup the ATM0 interface and bridged it to the BVI1 interface.
> So far so good.
> Got a lan configured also and NAT is doing ok.
>
> However I'm getting a much lower bandwith then with the ISP supplied
> modem.
> With the Thompson SpeedTouch modem I can transfer @ about 720KBs but
> with the 877 I can't pass the 320KBs
>
> Called the ISP support, who said that the 877 was not a supported
> equipment, but they gave me some usefull(?) info.
>
> The guy said:
>
> PCR: 4000
> SCR: 4000
> QoS type UBR
> MBS: 10
>
> I read a bit about this and I now I have minimal understanding how
> this affects speed in a link. My troube now is how to tell te 877 to
> use these values.
>
> The only way I found to specify the pcr and scr was trough the vbr-nrt
> command on the config-if-atm-vc
> this is where I got stuck
>
> #vbr-nrt 4000 4000 10 should do it, right? but the maximum value I
> can use is 747
>
> c877(config-if-atm-vc)#vbr-nrt ?
> <32-747> Peak Cell Rate(PCR) in Kbps
>
> this rate limit also apears on ubr and ubr+
>
> and can be checked on the interface
>
> c877#show int atm0
> ATM0 is up, line protocol is up
> Hardware is MPC ATMSAR (with Alcatel ADSL Module)
> Description: --- ADSL to ISP ---
> MTU 4470 bytes, sub MTU 4470, BW 747 Kbit, DLY 490 usec,
> reliability 255/255, txload 1/255, rxload 1/255
>
> Then I tried a different approach, to set-up a vc-class in global
> config and tried to apply it
> to the pvc, but this is what i got
>
> c877(config)#int atm0
> c877(config-if)#pvc 0/35
> c877(config-if-atm-vc)#class-vc vdf
> Insufficient bandwidth on interface or invalid PCR. Available
> bandwidth = 747
>
> I guess this is the way, cos when I reduce the rate to, let's say 100,
> the download speed drops to about 40KBs right away.
>
> How can solve this? How can I raise the "Available bandwidth" value?
>
> Thanks
If you search this newsgroup you will find lots of references for
similiar issue.
The frist step to verify that you have the latest ADSL firmware loaded
onto your router.
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