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New Member

Available bandwidth on sh int mul1

Hi there,

From the output below, I do not know how does the available bandwidth calculate from 1024Kbit to 103K. The physical bandwidth is 1024Kbit. It is because of the policy-map configured?

Output:

ce-hq#sh int mul1

Multilink1 is up, line protocol is up

Hardware is multilink group interface

Description: To PE100 physical is S0/0/0

Internet address is x.x.26.242/30

MTU 1500 bytes, BW 1024 Kbit, DLY 100000 usec, <-----

reliability 255/255, txload 15/255, rxload 63/255

Encapsulation PPP, LCP Open, multilink Open

Listen: CDPCP

Open: IPCP, loopback not set

Keepalive set (10 sec)

DTR is pulsed for 2 seconds on reset

Last input 00:00:00, output never, output hang never

Last clearing of "show interface" counters 1w5d

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 5528

Queueing strategy: Class-based queueing

Output queue: 0/1000/64/5528/311484 (size/max total/threshold/drops/interleaves)

Conversations 0/42/256 (active/max active/max total)

Reserved Conversations 1/1 (allocated/max allocated)

Available Bandwidth 103 kilobits/sec <----

ce-hq#sh int s0/0/0

Serial0/0/0 is up, line protocol is up

Hardware is GT96K Serial

Description: To PE100

MTU 1500 bytes, BW 1024 Kbit, DLY 20000 usec,

reliability 255/255, txload 19/255, rxload 66/255

Encapsulation PPP, LCP Open, multilink Open

Link is a member of Multilink bundle Multilink1, loopback not set

Keepalive set (10 sec)

Last input 00:00:00, output 00:00:00, output hang never

Last clearing of "show interface" counters 1w5d

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 4

Queueing strategy: weighted fair [suspended, using FIFO] <-----

FIFO output queue 0/40, 4 drops

Thanks in advance.

maher

1 ACCEPTED SOLUTION

Accepted Solutions
Purple

Re: Available bandwidth on sh int mul1

Ok, here's how you work it out, given that the goodvoice policy is applied to the interface:

Available Bandwidth = Interface Bandwidth * Max-Reserved-Bandwidht - sum(bandwidth reservations)

Which gives you:

1024 * 0.75 - sum ( 60% of 1024 + 5% of 1024)

= 768 - (614.4 + 51.2)

= 768 - 665.6

= 102.4

And that matches your available bandwidth.

Hope that helps - pls rate the post if it does.

Paresh

4 REPLIES
Purple

Re: Available bandwidth on sh int mul1

Hi Maher,

Have you got a service-policy applied to the multilink interface ? If you do, you will find that the available bandwidth is a result of deducting the bandwidth reservations made by the service-policy from the interface bandwidth of 1024k.

Hope that helps - pls rate the post if it does.

Paresh

New Member

Re: Available bandwidth on sh int mul1

Hi Paresh,

Yes. Below is the output:

ce-hq#sh policy-map

Policy Map qos

Class RTP

Strict Priority

Bandwidth 50 (%)

set ip dscp ef

Class class-default

Bandwidth 25 (%) Max Threshold 64 (packets)

Policy Map goodvoice

Class Voice

Strict Priority

Bandwidth 60 (%)

compress:

header ip rtp

Class CallSignaling

Bandwidth 5 (%) Max Threshold 64 (packets)

Class class-default

Flow based Fair Queueing

Bandwidth 0 (kbps) Max Threshold 64 (packets)

Purple

Re: Available bandwidth on sh int mul1

Ok, here's how you work it out, given that the goodvoice policy is applied to the interface:

Available Bandwidth = Interface Bandwidth * Max-Reserved-Bandwidht - sum(bandwidth reservations)

Which gives you:

1024 * 0.75 - sum ( 60% of 1024 + 5% of 1024)

= 768 - (614.4 + 51.2)

= 768 - 665.6

= 102.4

And that matches your available bandwidth.

Hope that helps - pls rate the post if it does.

Paresh

New Member

Re: Available bandwidth on sh int mul1

Paresh,

Thanks for the explaination. Really appreciated.

cheers!

maher

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