Dear All Experts,
I would like to seek for your expertise to resolve the MQC Bandwidth allocation Question.
Please view the below scenario first. Note= Cisco IOS = 12.4.
bandwidth percent 50
bandwidth percent 30
from the above scenarior, we can calculate like that
Max-reserved-bandwidth = 25.6
Bandwidth of Class A = 128
Bandwidth of Class B = 76
Available bandwidth of Serial0/0 = 26
Cisco2600#show int serial0/0
Serial0/3/0 is up, line protocol is up
Hardware is HWIC-Serial
Queueing strategy: Class-based queueing
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/65/64 (active/max active/max total)
Reserved Conversations 2/2 (allocated/max allocated)
Available Bandwidth 26 kilobits/sec
My questions are"
1. What is the available bandwidth 26 kilobits for ? it is for class-default ?
We know that If class-default does not use the bandwidth, the unused bandwidth is available for use by class A and class B. If both classes need the bandwidth, they share it in proportion to the configured rates.
2. Let's say now Class A doest use the allocated bandwidth or not congestion happened, the free bandwidth of class A will give Class B or not ? or it just reserve for own classes used ?
3. Now, Class A already use exceed allocated 50% bandwidth, is it possible to gain some bandwidth from free Classes like Class B ?
Please kindly answer my questions :)
Really appreciate it @@
1) It should display packets being matched on the first entry
Class-map: B (match-any)
0 packets, 0 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: access-group name Z
0 packets, 0 bytes
5 minute rate 0 bps
Then it will increase packets matched on the second entry if there is congestion.
Output Queue: Conversation 74
Bandwidth 30 (%)
Bandwidth 76 (kbps)
(pkts matched/bytes matched) 0/0
(depth/total drops/no-buffer drops) 0/0/0
exponential weight: 8
mean queue depth: 0
2. Classes don't share their guaranteed bandwidth during congestion.
3. As the ACL matches nothing, this allocated bandwidth goes to waste. It's not given to any of the classes and taking away from the total available bandwidth from class-default during congestion. In other words, you are taking 76kbps from class-default during congestion as Class B isn't doing nothing at the moment.