04-30-2008 08:03 AM - edited 03-03-2019 09:45 PM
I have an 1841 ISR Router with a WIC-1ADSL card for my WAN connectivity. I have an RFC 1483 with the ATM terminating at my router:
Running config:
interface ATM0/0/0
no ip address
no ip redirects
no ip proxy-arp
ip route-cache flow
no atm ilmi-keepalive
dsl operating-mode auto
dsl enable-training-log
!
interface ATM0/0/0.1 point-to-point
description $FW_OUTSIDE$
ip address 209.x.x.x 255.255.255.248
ip access-group OutsideACL in
ip verify unicast reverse-path
no ip redirects
no ip proxy-arp
ip nbar protocol-discovery
ip nat outside
ip inspect OUTBOUND out
ip ips sdm_ips_rule in
ip virtual-reassembly
atm route-bridged ip
pvc 0/32
!
My problem is trying to apply a QoS policy. If I try to apply the policy to the ATM subinterface (with the IP address) I get:
BorderRouter(config-subif)#service-policy output ShapeOutbound
CBWFQ : Not supported on subinterfaces
If I try to apply the service policy on the VC 0/32, the router hangs for about 20 seconds, and then never applies the service policy.
BorderRouter#sh policy-map interface atM 0/0/0.1 vc 0/32
Service policy is not configured on VC 0/32
Is there any way to apply an outbound service policy map on a DSL interface? I have a Dot1q trunk on my Ethernet interface (to my switch), so I cant apply it there.
Any other ideas, or something I am missing? Oh and: 124-19.bin is my current IOS.
Solved! Go to Solution.
05-01-2008 08:36 AM
Hi Bill,
When applying CBWFQ policy to a vc you have to make sure you configured COS for ATM vc as VBR or ABR otherwise the policy can not be applied per VC.
Please refer to this guide when configuring QoS for IP to ATM:
http://www.cisco.com/en/US/docs/ios/qos/configuration/guide/ip_to_atm_cos.html#wp1001308
note this statement in the VC configurations in the document:
vbr-nrt 5000 3000 500
-serg
04-30-2008 05:14 PM
Since you didn't post either your policy or note your PVC bandwidth, can't say whether this is the issue, but I've encountered "silent drops" of service policies if the interface's bandwidth didn't support the bandwidth requested by the policy. (BTW: The "silent drops" gave no indication at the command line, but I recall there was a syslog entry made.)
05-01-2008 06:27 AM
Ok, some replies:
CEF is enabled.
NBAR is enabled (requires CEF)
I set the bandwidth on both ATM0/0/0 & 0/0/0.1 to 864, same message about CBWFQ not supported.
PVC does not support bandwidth command.
When I apply the command I get this error thrown in the syslog: 001606: May 1 09:25:41.403 CDT: I/f ATM0/0/0.1 VC 0/32 class Bulk requested bandwidth 0 (kbps), available only 0 (kbps)
The simple service policy I am trying out:
class-map match-any Bulk
match protocol edonkey
match protocol gnutella
match protocol fasttrack
match protocol kazaa2
!
!
policy-map ShapeOutbound
class Bulk
bandwidth percent 20
05-01-2008 08:36 AM
Hi Bill,
When applying CBWFQ policy to a vc you have to make sure you configured COS for ATM vc as VBR or ABR otherwise the policy can not be applied per VC.
Please refer to this guide when configuring QoS for IP to ATM:
http://www.cisco.com/en/US/docs/ios/qos/configuration/guide/ip_to_atm_cos.html#wp1001308
note this statement in the VC configurations in the document:
vbr-nrt 5000 3000 500
-serg
05-06-2008 10:07 AM
Brilliant!
This has been an unresolved problem for me for a long time =)points will be awarded.
Now one last question, if you have an asynchronous connection like mine, 1500 down, 864 up; is there any way to set the downstream speed higher (default will only let you to up to the smaller number) or should I just over-commit my policy maps?
05-07-2008 02:00 PM
Well, I thought I already earned some points ;) just kidding...
As far as I remember you can not oversubscribe if you use vbr-nrt, the router will complain I think.
You can play with other settings and use ubr which will correspond the downstream speed on the pvc. Read through the doc on use ubr.
Another thing is that DSL speed is dynamic depends a lot on a quality of your last mile copper pair and sometimes the rate can go down so well your setting for vbr or ubr on the pvc. Hope it makes sense what I'm saying....
-serg
05-08-2008 05:31 AM
Sure does, Thanks Serg & everyone! Next book I am going to read is QoS =)
04-30-2008 07:47 PM
hi, did you enable cef ?
It's required for QoS config.
-serg
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