11-28-2016 02:40 PM - edited 03-08-2019 08:20 AM
Hello, can you put the command 'priority-queue out' command on a trunk interface or is this only for layer 3 interfaces ?
Thank you.
11-29-2016 01:14 AM
Hi
You would only use that on an access port layer 2 where a phone/pc is connected not on a trunk or layer 3 interface
it basically services the priority queue in qos before any other queue , be careful using this it can cause starvation for the other queues in mls qos when in place , you get 4 queues 1 p and 3 srr or wrr , the p queue when there's packets in it will be used first to ensure no delay in critical traffic like voice
11-29-2016 10:37 AM
Hello guys, thanks for your replies however they seem contradictory.
Can someone please clarify if it is valid/common to use this command on a L2 trunk interface ?
My consideration is that if the trunk between two switches is bottlenecking, then perhaps this command would expedite EF marked traffic via 'priority-queue out'.
Thank you kindly.
11-29-2016 12:46 PM
Unable to comment how "common" this is, especially as QoS isn't as common as it probably should be.
However, here's an interface config from an active 3560:
xxx#sh run in g0/1
Building configuration...
Current configuration : 247 bytes
!
interface GigabitEthernet0/1
description PHY|1G|TRUNK|rhost:xxx|rport:ge0/1
switchport trunk encapsulation dot1q
switchport mode trunk
srr-queue bandwidth share 25 5 25 70
priority-queue out
mls qos trust dscp
end
PQ is enabled to support DSCP EF.
11-29-2016 06:28 AM
It should support any interface, trunk, L3 or L2.
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