cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
Announcements
213
Views
0
Helpful
3
Replies

QoS on Trunks

We run both VOIP and video over a multi-site WAN MPLS. We have our UCS server in our Michigan site and it operates about 150 phones in our North Carolina site. I have setup QoS on the switchports that the phones are connected to. I have seen that some engineers setup QoS on their trunking ports as well. My question is, should QoS be applied to trunks as well as access ports and if so what benefit does it provide?                  

3 REPLIES 3
VIP Expert

Re: QoS on Trunks

Disclaimer

The  Author of this posting offers the information contained within this  posting without consideration and with the reader's understanding that  there's no implied or expressed suitability or fitness for any purpose.  Information provided is for informational purposes only and should not  be construed as rendering professional advice of any kind. Usage of this  posting's information is solely at reader's own risk.

Liability Disclaimer

In  no event shall Author be liable for any damages whatsoever (including,  without limitation, damages for loss of use, data or profit) arising out  of the use or inability to use the posting's information even if Author  has been advised of the possibility of such damage.

Posting

As trunks aren't immune to congestion, you may want QoS on them for reasons similar to other congested ports.

The big difference between a trunk port vs. an access port, the latter may/should deal with initial trust issues.  Hopefully, by the time traffic is on a (transit) trunk, congestion QoS is the only issue.

Contributor

Re: QoS on Trunks

Hi Brian,
even if I fully agree with Joseph, a common design prefers to over provision trunk capability rather than implementing QoS on the trunk ports. On the other hand, maybe the geographical distance requires particular markings (Voice and Video) and prioritisation in order to reduce the processing and serialisation delays.

Hope this helps
Alessio

Sent from Cisco Technical Support iPad App

Highlighted
Beginner

Re: QoS on Trunks

Hi, like Joseph says, the trunk are practically inmune to a congestion.

But, you must configure cos/dscp trust on this port, to avoid that the switch remark the frames or packets.

Good Bye.

Juan

CreatePlease to create content
Content for Community-Ad
July's Community Spotlight Awards