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Implementing QoS on edge routers

Hi all,

 

I've a question regarding implementing QoS in the LAN. There is a bunch of L3-L2 switches with support of 802.1p. ISR 2921 is on the edge of the network. I need to guarantee service to some kinds of traffic in case of congestion of the uplink to the internet (attached).

Could I somehow mark interesting traffic on ISR from the LAN side and apply some QoS policy to it? What criterias could I use? Thanks beforehand.

 

 

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Hello,

 

Yes it is possible. You may try to use the model from the following link:

http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND/QoS-SRND-Book/BranchQoS.html

 

There are other QoS scenarios also in the above mentioned Enterprise QoS Solution Reference Network Design Guide.

HTH,

Alex

*Please rate helpful posts

 

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Hello,

 

Yes it is possible. You may try to use the model from the following link:

http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND/QoS-SRND-Book/BranchQoS.html

 

There are other QoS scenarios also in the above mentioned Enterprise QoS Solution Reference Network Design Guide.

HTH,

Alex

*Please rate helpful posts

 

View solution in original post

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Thanks, Alexander. Seems good. Will investigate this material!

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Posting

As Alexander has already noted, it's possible to both mark and apply a QoS policy, on your 2921, toward the Internet.

However, toward the Internet, there isn't a need to mark the traffic, as the Internet doesn't generally honor any marking and you don't need to to manage any egress congestion.

Regarding what criteria to use, that depends on what you QoS goals are.  You can give preference to VLAN 1 traffic over VLAN 2 traffic; the amount of preference could be from a slight bump to almost absolute right-of-way.  You also can treat traffic differently based on application, alone or also considering the source VLAN.

Generally, I initially recommend fair-queue for all traffic (except real-time).  You can later, further evolve a QoS policy, but FQ at least often insures that a bandwidth hog isn't adverse to other flows.

Lastly, with Internet, there's the problem of the QoS treatment for inbound traffic.  Unfortunately, if you're unable to (QoS) manage the far side's egress (to you), you're very much impeded by how effective you ingress QoS might be.

Oh, and the type of documentation that Alexander recommended is very good, but it will probably recommend end-to-end and edge QoS.  Nothing wrong with that, but having an effective QoS policy at your principle congestion point(s), alone, can be a very effective ROI.

 

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