09-13-2011 05:45 AM - edited 03-04-2019 01:35 PM
Hi,
I'm testing QoS with a 3750-X
I want to mark traffic in the 192.168.126.0/24 subnet with DSCP EF.
I've entered this command :
mls qos
class-map match-any class_126
match access-group 2
policy-map mark_dscp_126
class class_126
set dscp ef
access-list 2 permit 192.168.126.0 0.0.0.255
And I affect this policy to port 8 :
service-policy input mark_dscp_126
I've a PC on port 8 with IP 192.168.126.1 and I'm doing an iperf test with an other PC :
Without policy :
[ ID] Interval Transfer Bandwidth
[ 4] 0.0- 3.0 sec 273 MBytes 763 Mbits/sec
[ 4] 3.0- 6.0 sec 276 MBytes 772 Mbits/sec
[ 4] 6.0- 9.0 sec 275 MBytes 770 Mbits/sec
[ 4] 0.0-10.0 sec 916 MBytes 768 Mbits/sec
With policy :
[ 4] 0.0- 3.0 sec 15.1 MBytes 42.3 Mbits/sec
[ 4] 3.0- 6.0 sec 13.6 MBytes 37.9 Mbits/sec
[ 4] 6.0- 9.0 sec 12.5 MBytes 35.1 Mbits/sec
[ 4] 0.0-10.3 sec 46.1 MBytes 37.7 Mbits/sec
Why bandwith is limited when traffic is marked ?
Solved! Go to Solution.
09-14-2011 07:18 AM
Did you enter 'priority-queue out' under all interfaces?
09-14-2011 03:01 AM
When I mark traffic with DSCP AF11, there is no problem...
I'v a high bandwith...
09-14-2011 05:28 AM
Is there any shaping applied on the interface
Can you post the interface config
09-14-2011 06:26 AM
No shaping...
interface GigabitEthernet1/0/8
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 8,62,120,122-126,128,129,172
switchport mode trunk
service-policy input mark_dscp_126
Ans also :
gw_c3750_ma_01#sh mls qos input-queue
Queue : 1 2
----------------------------------------------
buffers : 90 10
bandwidth : 4 4
priority : 0 10
threshold1: 100 100
threshold2: 100 100
gw_c3750_ma_01#sh mls qos queue-set
Queueset: 1
Queue : 1 2 3 4
----------------------------------------------
buffers : 25 25 25 25
threshold1: 100 200 100 100
threshold2: 100 200 100 100
reserved : 50 50 50 50
maximum : 400 400 400 400
Queueset: 2
Queue : 1 2 3 4
----------------------------------------------
buffers : 25 25 25 25
threshold1: 100 200 100 100
threshold2: 100 200 100 100
reserved : 50 50 50 50
maximum : 400 400 400 400
Thank you
09-14-2011 07:18 AM
Did you enter 'priority-queue out' under all interfaces?
09-14-2011 11:23 PM
Thank you, with "priority-queue out", the bandwith is high again
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