Unanswered Question
Feb 19th, 2009
User Badges:

Hi Guys,

I need some help with QoS with this scenario. Take a look at the attached.

There are 3 sites connected with 100Mbps LES circuits with a 3560 on each site.

I have configured STP priority to load share some of the traffic.

Vlan 100 is going to be used to route Voice and Data between site 1 and 2. I would like this to have priority over the other VLAN's

I would also like the Voice to have priority over the Data within VLAN 100.

VLANS 20-23 are just Layer 2 VLANS for some services between sites but I don't want them choking VLAN 100 in the case of a link failure.

I have QOS configured on each site for the LAN where the 802.1p is trusted for the Voice but I need some help with the other stuff.

Many Thanks in advance.


  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 3 (2 ratings)
Edison Ortiz Thu, 02/19/2009 - 09:54
User Badges:
  • Super Bronze, 10000 points or more
  • Hall of Fame,

    Founding Member

Vlan 100 is going to be used to route Voice and Data between site 1 and 2.

I recommend having one Vlan for Voice and another Vlan for Data.

Having both traffic on the same Vlan is just a bad design all around.

As for QoS features within the 3560, you are quite limited. It's mainly used for marking traffic and it has limited queueing/prioritization options.

Please refer to the documentation:





shevchiksv Sat, 02/21/2009 - 13:12
User Badges:

I think that you can create, for example, 1st queue(priority queue) for your voice and date vlans, mark it(vlan-based), and give priority before other type of traffic. As for ingress queueing you also have default 2 queue. So i suppose that 3560 has still sufficient queueing features


This Discussion