08-05-2009 12:19 PM - edited 03-04-2019 05:39 AM
I have an mppp line with 3 t-1's in the bundle. When I "show int mu1", it says "Available Bandwidth 1 kilobits/sec". how can that be? I do have some qos configured on this inteface too.
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08-05-2009 04:43 PM
You're welcome Daryle.
Please rate my post if it was helpful for you.
Thanks:
Istvan
08-05-2009 01:32 PM
Hello,
Can you post the configuration of your multilink interface here please?
Best regards,
Peter
08-05-2009 01:47 PM
Here's the mu1, with a few things x'd out:
interface Multilink1
ip address xxx.xxx.xxx.xxx 255.255.255.252
no ip route-cache cef
ip route-cache flow
no ip mroute-cache
load-interval 30
delay 3000
no peer neighbor-route
ppp multilink
ppp multilink group 1
service-policy output xxxxxx
end
thanks,
08-05-2009 01:57 PM
Hello,
Thank you. Try setting the combined bandwidth using the command bandwidth on the interface. You are using three T1 then configure it as:
bandwidth 4632
Please let us know if this worked. Note that the interface reserves 25% for framing overhead and control traffic, therefore, only 75% of the configured bandwidth is available.
Best regards,
Peter
08-05-2009 03:25 PM
I added bandwidth 4632, but there was no change.
I'll keep looking.
08-05-2009 04:04 PM
Can you post the configuration of the policy-map you use on the Multilink interface?
Thanks:
Istvan
08-05-2009 04:10 PM
here is the policy map, I think its fairly simple:
policy-map xxxxxxx
class PRECEDENCE5_cmap
set ip precedence 5
priority percent 35
class PRECEDENCE4_cmap
bandwidth percent 25
class PRECEDENCE3_cmap
bandwidth percent 15
thanks
daryle
08-05-2009 04:32 PM
The total available bandwidth is 100% without configuring any policy-map on the interface.
In your configuration, you allocated 75% of the available bandwidth to several traffic types. Remains 25%.
Although in your configuration it is not apparent, there is a class-default queue within your policy-map. By default it is allocated 25% of the available bandwidth.
You can check it using the "show policy-map interface multilink1" command.
Altogether, if you add up all the bandwidths you configured + this 25% bandwidth, all the 100% bandwidth is used up: 35%+25%+15%+25% = 100%.
This is why you get the "Available bandwidth 1kbps" message, which is I think may be just a rounding calculation error in the software.
The Available bandwidth message simply indicates how much of the interface bandwidth is still available for allocation to additional traffic types within your policy-map.
It does NOT mean you don't have the bandwidth of the 3 T1 lines.
Use the show interface multilink1 command to look at the bandwidth of the interface (and it will also display the available bandwidth for allocation to additional traffic types).
You should use the "bandwidth" command under the multilink interface to set the real bandwidth (if it isn't already set automatically to the right number) so QoS functions correctly.
Cheers:
Istvan
08-05-2009 04:40 PM
thanks for a great explanation. I'll keep the qos config in mind in the future.
thanks,
daryle
08-05-2009 04:43 PM
You're welcome Daryle.
Please rate my post if it was helpful for you.
Thanks:
Istvan
08-05-2009 10:32 PM
Istvan,
Thank you for explaining this!
Best regards,
Peter
08-06-2009 07:47 AM
You're welcome Peter.
Thanks for your rating!
Cheers:
Istvan
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