QOS: LAN/WAN

Unanswered Question
Mar 12th, 2009

Looking to add QOS shaping to the router outside interface. How should I mark traffic on the LAN (igree/egress) AND ON the WAN. How will the switch mark the CUCM and IP Phone packets.

Circuit 2MB (MPLS)

Network Setup

[CUCM & UNITY]---Sw3560---trunk(802.1Q)---RTR2821----MPLS(2MB)------RTR2821---trunk(802.1Q)---RTR2821---SW3560---IP PHONE

I have this problem too.
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Edison Ortiz Thu, 03/12/2009 - 16:48

Hi Colm,

How should I mark traffic on the LAN (igree/egress) AND ON the WAN.

Mark the traffic on ingress at the switch and set whatever policies you need on the WAN router egress interface (priority|bandwidth|etc).

How will the switch mark the CUCM and IP Phone packets.

You can trust dscp on the switch interface for packets coming from those devices or you can create an ACL and match on the source while setting the desired dscp value.

I recommend reading this document:

http://www.cisco.com/en/US/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND/QoS-SRND-Book.html

HTH,

__

Edison.

Joseph W. Doherty Thu, 03/12/2009 - 18:08

Edison's reference provides all (or at least most of) the details. In brief, you want to insure there's sufficient physical bandwidth to support your traffic needs, and QoS to insure that your traffic obtains it when it needs it.

Since you have MPLS shown for the WAN, you'll need to understand what the MPLS does with marked packets by default and by your request. If just two sites, you can manage the MPLS WAN without MPLS QoS support. If there is active MPLS QoS, you'll need to work within what it provides or can provide. (Edison's MPLS reference also mentions, something like MPLS can require remarking packets going into MPLS [and also perhaps exiting MPLS.])

Joseph W. Doherty Thu, 03/12/2009 - 18:25

Edison's reference provides all (or at least most of) the details. In brief, you want to insure there's sufficient physical bandwidth to support your traffic needs, and QoS to insure that your traffic obtains it when it needs it.

Since you have MPLS shown for the WAN, you'll need to understand what the MPLS does with marked packets by default and by your request. If just two sites, you can manage the MPLS WAN without MPLS QoS support. If there is active MPLS QoS, you'll need to work within what it provides or can provide. (Edison's MPLS reference also mentions, something like MPLS can require remarking packets going into MPLS [and also perhaps exiting MPLS.])

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