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smeegs
join:2008-06-28
| [Config] CBWFQ for PPPoA connection
Hi guys,
I'm stuck on a bit of config for my home router at the moment. I have a 1721 with an ADSL WIC running 12.4(19) and I am trying to apply CBWFQ for the internet bound queue.
I have successfully applied the same policies to a lab using serial interfaces, so my class and policy maps are fine.
From reading around, I think the problem is with the Virtual-Access interface not picking up the CBWFQ strategy from the Dialer interface (the VA according to Cisco is where the queueing will occur), and it's still reading 'fifo'. I can't figure out how to apply the queueing strategy to the VA. I got the feeling from one post that for PPPoA I may need to use a multilink interface, and from another that a simple shut/no shut fixed the problem... I even tried a reboot just for kicks.
I don't know if this is related or not either, but I'm also getting zero conversation count for a 'sh qu d1' which I'm pretty sure shouldn't be zero.
Relevant output is included below;
A snapshot of 'sh policy-map int d1'
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ciscoiphead
join:2007-07-03
Ashland, VA
| The best place is on the physical ATM interface:
interface ATM0/0/0
no ip address
load-interval 30
no atm ilmi-keepalive
dsl operating-mode itu-dmt
dsl enable-training-log
pvc 0/35
vbr-nrt 448 448 1
tx-ring-limit 3
encapsulation aal5snap
service-policy output V3PN
pppoe-client dial-pool-number 1
#sh queueing interface atM 0/0/0
Interface ATM0/0/0 VC 0/35
Queueing strategy: weighted fair
Output queue: 0/512/64/0 (size/max total/threshold/drops)
Conversations 0/4/32 (active/max active/max total)
Reserved Conversations 2/2 (allocated/max allocated)
Available Bandwidth 22 kilobits/sec | |
deepblackmag
join:2004-12-27
99999
| reply to smeegs
Abandon all hope.
I spent (read: wasted) an epic amount of time trying to get low latency queueing working on the wic-1adsl.
Long story short (search for one of my previous threads in this forum for some interesting cisco output and debugging details) it was a tremendous failure. The virtual interfaces such as the dialer or virtual access would never experience a state of congestion (thus never prioritize) and sticking the service policy on the ATM PVC seemed to yeild no significant results. Also managed to somehow configure the service-policy and VBR-NRT settings in such a way that when the upstream was indeed congested, the router would start droping keepalives and LCP would flap lol. Oh fun times with cisco routers.
Nested shaping turned out to be impossible as well on adsl, and some of the error messages still have me trying to figure out what they mean: Inconsistent qid (3946070) found in AVL for service policy 0x86789618
TL;DR use an external DSL modem and set the service policy on an ethernet interface where it might actually do some good. | |
ciscoiphead
join:2007-07-03
Ashland, VA
edit:
June 29th, @06:28PM
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smeegs
join:2008-06-28
| reply to ciscoiphead
Thanks,
I tried applying the policy on the PVC and when I do a sh policy it just returns a blank line. I think I will just use a MODEM and apply the policy on an ethernet interface.
I can't find the link now, but I was reading on Cisco's site and got the impression from one of their articles that the ADSL WIC itself may not support CBWFQ. Although I thought all hardware queues were FIFO and the scheduler that will achieve CBWFQ is all software anyway. I don't know... | |
aryoba
Premium,MVM
join:2002-08-22
| Did you check out this forum FAQ before posting?
»Cisco Forum FAQ »Router runs VoIP, Bit Torrent, Online Gaming; DynDNS - QoS Sample Configuration
Note that the traffic shaping implementation helps when congestion occurs within your network (the network you have control over). When the congestion occurs outside your network (i.e. the ISP network), then there is pretty much nothing you can do unless your ISP is willing to implement similar traffic shaping implementation to their network to match your configuration (which I doubt they will do). | |
smeegs
join:2008-06-28 | Thanks aryoba,
I am aware of what I can and can't achieve, the problem is the policy-map not actually applying to the PVC. | |
smeegs
join:2008-06-28
| I just tried an 837 and no luck with that either.
I apply the policy to the PVC and it's in the running config, but then I do a sh policy-map int at0 vc 8/35 and it says no policy applied.
The really strange this is when I do a sh run again, the service-policy line is gone  | |
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