Showing results for 
Search instead for 
Did you mean: 

QOS per VLAN IN Switch 3850

Hi Dear Friend I have switch 3850 with Trunk port

No i want Limit VLAN BW Per vlan


note: Switch is Layer 2 Only

I want  pilocy any trafiic TX OR RX on vlan 34 For example

VLAN 34 Shapping 60M TX and 60M RX



Everyone's tags (1)
Hall of Fame Expert

Re: QOS per VLAN IN Switch 3850


Re: QOS per VLAN IN Switch 3850

Thx For your help but

I want apply Different QOS on Different VLANS

For example vlan 34 10M

VLAN 33 5M

And apply On Trunk Port Interface


i Assign only One Service policy on Physical Trunk Interface

Please Help me


My config is:

class-map vlan 34

match vlan34

policy-map vlan 34

class vlan 34

police 10000000 bc conform-action transmit exceed-action drop


Now Assign policy-map on Trunk physical Interface

interface tengigabit 1/0/7

service-policy input vlan34

service-policy output vlan34


But Not working



Everyone's tags (2)
Rising star

Re: QOS per VLAN IN Switch 3850

Cisco switches aren't quite routers, even if IOS-XE would have you believe that anything goes ;) 


If you want to use policy-maps for bandwidth, you do it per port and not per SVI. You can use SVI's for marking, sure, but not for bandwidth restrictions. 


The supports a VLAN QoS feature that allows the user to perform QoS treatment at the VLAN level
(classification and QoS actions) using the incoming frame’s VLAN information. In VLAN-based QoS, a
service policy is applied to an SVI interface. All physical interfaces belonging to a VLAN policy map then
need to be programmed to refer to the VLAN-based policy maps instead of the port-based policy map.
Although the policy map is applied to the VLAN SVI, any policing (rate-limiting) action can only be performed
on a per-port basis. You cannot configure the policer to take account of the sum of traffic from a number of
physical ports. Each port needs to have a separate policer governing the traffic coming into that port.

Re: QOS per VLAN IN Switch 3850

Thank you For attention
Please Help me
How limit BandWitdh Of VLANS (layer 2 Switch work only )
In switch 3850???
Rising star

Re: QOS per VLAN IN Switch 3850

You don't, at least not on the switch directly. Here are some alternatives:


One option is a router on a stick:  send all VLANs to the gateway and apply a policy-map per subinterface. This assumes that traffic isn't being switched on the L2 switch between access ports, doable via proxy-arp on router and private-vlans/protected ports on the switch, so all traffic from these VLANs goes up to the router and is there being policied. Make sure the router port isn't a bottlneck.


Another option: Ugly ugly option. Each access port from the switch (S1) will be a single-vlan trunked to a second switch (S2). Each physical port on S1will have its own policy. They are aggregated at S2 and then sent along via a 802.1q. Make sure not to oversubscribe the downlink at S2.








Re: QOS per VLAN IN Switch 3850

Hi Dear You Say donnot have any solution For Limit Traffic VLAN In switch 3850???? In trunk Mode
CreatePlease to create content
Content for Community-Ad