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ascheler2Flag for United States of America asked on

Cisco 3560 QoS on trunk ports (switch-to-switch)?

If I have QoS defined on interfaces, should I/must I have QoS defined on the switch-to-switch trunk ports?  In reviewing our configs, I noticed that some of our trunk ports have the QoS-related settings while others do not.  Some in my circle have said that we can remove all QoS settings on these trunk ports while others say the QoS settings should be added to all trunk ports.  I am not familiar enough with QoS to fully understand the impact.  (It would seem to me that I should have QoS defined because it seems odd to me to allow congestion without prioritization at the trunks - however unlikely this congestion might be given the speed of the trunks.)

Please advise.  Looking for a good explanation.  Thanks!

interface GigabitEthernet0/49
 description IDF to MDF Trunk
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 999
 switchport trunk allowed vlan 10,20,30,400,500,800,999
 switchport mode trunk
 srr-queue bandwidth share 10 10 60 20
 srr-queue bandwidth shape  10  0  0  0
 queue-set 2
 mls qos trust cos
 auto qos voip trust
 
interface GigabitEthernet0/50
 description IDF to MDF Trunk
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 999
 switchport trunk allowed vlan 10,20,30,400,500,800,999
 switchport mode trunk
Switches / HubsVoice Over IPNetworking Hardware-Other

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ascheler2

8/22/2022 - Mon
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ascheler2

Thank you.
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