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(?) 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 ? 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?