I have a client with an ADSL connection using Cisco 1720 IOS V:12.3.5a with the WIC-1ADSL card. They have normal traffic requirements for a small business site; mail server in, web traffic out, FTP server in & out. My questions is how to implement QoS so the FTP server does starve the upstream pipe.
The FTP server that is causing problems. According to MRTG, there are continuous upstream traffic (client site to the Internet) of approx 60 kbytes/s that fill up the pipe going out. I see max traffic outbound steady for 24 hours at a time. I'm also seeing a steadily increasing number of output drops on the ATM0 interface.
The DSL connection is PPPoE with an ATM interface. Here's a snapshot of the interfaces with load. These loads are typical.
DSL# sho int | include is up|xload
ATM0 is up, line protocol is up
reliability 255/255, txload 219/255, rxload 41/255
ATM0.1 is up, line protocol is up
reliability 255/255, txload 219/255, rxload 41/255
Dialer0 is up, line protocol is up (spoofing)
reliability 255/255, txload 1/255, rxload 1/255
Virtual-Access1 is up, line protocol is up
reliability 255/255, txload 247/255, rxload 126/255
FastEthernet0 is up, line protocol is up
reliability 255/255, txload 1/255, rxload 1/255
I enabled RED on the ATM0 PVC interface. I only have one PVC so it must be the DSL. Here's the queueing:
DSL# sho queueing
Current fair queue configuration:
Interface Discard Dynamic Reserved Link Priority
threshold queues queues queues queues
Dialer0 64 16 0 8 1
Current DLCI priority queue configuration:
Current priority queue configuration:
Current custom queue configuration:
Current random-detect configuration:
VC 0/35 -
random-detect group default:
exponential weight 9
class min-threshold max-threshold mark-probablity
----------------------------------------------------------
0 - - 1/10
1 - - 1/10
2 - - 1/10
3 - - 1/10
4 - - 1/10
5 - - 1/10
6 - - 1/10
7 - - 1/10
rsvp - - 1/10
Current per-SID queue configuration:
I thought I would be seeing drops if RED is working properly. I can't put fair-queue on an ATM interface. Don't know why fair-queue is showing up for the Dialer0.
Any suggestions on what QoS strategy to use?
