Question of marking DSCP QoS VCS.

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• Traffic policy - marking DSCP value

  Dear all,

  I'm trying to set up a strategy of traffic on a 2048 P Dell switch. The policy aims to modify the DSCP value of the traffic going to a server specific DSCP 0 to 10 value. Interface 3/0/3 is the PC that connects to the server 10.51.53.16.

  I see incrementation of the output packages to see the switch, but when I perform a wireshark tracing by monitoring the PC port, the DSCP value remains at 0 instead of 10.

  Configuration as follows:

  class-map correspondence class_ccx ipv4

  game of supporting 10.51.53.16 255.255.255.0

  output

  Policy-map test_policy in

  class class_ccx

  Mark dscp-ip 10

  Show running-config interface gigabitethernet 0/3/3

  policy - test_policy

  Interface...................................... IG3/0/3

  Direction...................................... In

  Working condition... Upward

  Name of politics... test_policy

  Name of the class... class_ccx

  In the packages offered... 573

  In the packages retired... 0

  See the class_ccx class-map

  Name of class... class class_ccx Type... All the class Layer 3 of the ipv4 Protocol...

  Criteria values - IP address of Destination 10.51.53.16 (255.255.255.0)

  Name of the class... class_ccx
  Mark IP DSCP... 10 (AF11)

  As mentioned, I see no evidence that the DSCP value has been changed for traffic going to my server.

  Thank you very much

  Jamie

  Here's my thought process and the reason that I suggested to check the packets received on the interface of the connected server.

  -The client sends the packet with 0

  -Interface receives this packet and it reflects in the port of destination.

  -Shows OCAP receive packets as the value 0

  -Once the package has been mirrored, the switch sees so it corresponds to the assigned policy and replaces the value 10.

  -Switch transmits packets on the interface of the server.

  At this point the packet on the server side port should be observed with the DSCP of 10 value. We can confirm that by putting up a session session on this interface.

  -If the server is configured to send packets with a different priority, or maintain the priority, the server sends probably packages with a value of 0

  -Switch receives packets of the server returning to the client.

  -Switch has no policy IN this interface, and the DSCP value 0 is maintained.

  -Switch transmits the packet customer facing interface.

  This translates into OCAP showing the value of DSCP 0 to in and out traffic on the customer facing interface.

• Another issue of queues DSCP/QoS/CoS of 6500/7600

  OK... a little confused, thinking, that I know what needs to happen, and what is happening now, but it is true UN-certainty with that I hope that people can help.  Here are the basic configuration:

  A---|6500|--10G--|7604|---10G---|7604|---10G---|6500|---B

  You get the point.  Traffic crossing A-> B or vica versa.

  All the links of the kernel are L3/Routed, not L2/Vlan/.1q/ISL

  Traffic is marked on the Board with a political map of penetration.

  Traffic is confirmed through DURATION that it contains both CoS and DSCP/ToS, leaving the 6500 s two-way headed the core of 7600

  Traffic is ALSO confirmed through extending classes * receipt * on the other side by the 6500, that DSCP is maintained but CoS is gone/0.

  Considering that only 6708 - 10G modules allow apparently dscp values mapped to the queues/thresholds, which leaves me with the research of the queue on the penetration (for VoIP traffic priority) with cos-of-queue / beat mapping as well as output with cos to queue mappings.  Of course, this is not possible (at least on the penetration) if the 7600 are not preserving the CoS on the output of the port.

  This leaves wondering if the 7600 are same queue evacuation traffic based on internal mapping supposed DSCP-to-CoS that is supposed to happen before the queue/Scheduler.  Interfaces are all set up as "trust dscp" right now.  So the CISCO docs should be rewriting CoS to 0 on the penetration and using reliable dscp values to determine internal DSCP, which in turn should be used with DSCP-CoS map appropriate queue on exit... I am a sceptic, what happens really... and unfortunately, have really no way to verify (that I know) because the show on the 6500/7600 commands are fairly primitive about QoS stats...

  Then, we have been re - think about it and thought that maybe the thing to do to solve this problem is to:

  -Trust cos instead of dscp

  -enable transparency dscp (no rewriting dscp) so it is kept on the side of the switch output

  And so by doing this it would be:

  -use CoS to tail of penetration

  -use CoS to output queues

  - And to preserve the original CoS and DSCP/ToS values

  Would that be correct?

  Two other config options I thought were:

  -queue only mode

  -mpls cos spread (although I don't think that would do what I want, but rather simply spread non-existent MPLS EXP bits)

  Any help would be greatly appreciated... I read so many different docs now, my head is swimming

  Couple of caveats-

  (1) all the below apply to pre IOS 15, as I have no experience with which it may be different

  (2) I have not used a 7600, but I used the 6500 much but both share a large number of the linecards and I suspect you're referring to this kind of linecards.

  The main problem is that the CoS value is contained in the 802. 1 q non-native added tag VLANs on a trunk link. But your links are L3 if there is no value CoS to preserve.

  This creates two problems for you-

  (1) input queues. On penetration, the queues are CoS based which means you need to a CoS value to assign packets into queues. On the 7600 s you're obviously not see a CoS value for the reason explained. Now, you can use a political map and a service policy to classify and mark inbound traffic. But, as far as I know, you can set the IP precedence or DSCP marking in a map policy on traffic of the penetration. Some cards like cards ARE for the 7600 support defining a CoS value but I think they are the exception rather than the norm.

  (2) output queues. You are right in what you say, IE. You can trust the DSCP/IPP incoming value and then, assuming that the line card doesn't support based DSCP output queue, the 7600 may derive a value based on the internal DSCP value CoS and then put in the correct output queue.

  Yet once, however, without a trunk there no value written in the packet CoS.

  I entirely agree that it can be very difficult to tell exactly what the 6500 in terms of marking internal etc. This is one of the great frustrations with the 6500.

  Hope some of that helped.

  Edit - the only way that you can trust CoS on penetration as far as I can see is to make the trunk links IE. you use a vlan dedicated for each interconnection and allow only that vlan on the link. Then you simply transfer the IP addresses assigned to the physical ports for the SVI to the new VLAN on each switch. You should make sure that the vlan that you authorized through the link was not the vlan native because you need a tag to add.

  Jon

• Question about marking

  I don't know, but I'm not sure tagging in Firefox. The Firefox team changed the marking in subsequent revisions of Firefox?

  Back to 4 FF, I think I made som tags on a certain address (in this case www.tranceadict.com) which in turn created a virtual folder called Tranceaddict.

  When you look at in the tags to the bookmarks in that folder, I don't see any tags applied to all. So I wonder how I could create such a virtual folder before, but not now?

  Thank you!

  Okay, I think that now I get what you are referring. the interface to create smart folders to a library search was apparently removed in firefox 19. You can install the following addon in order to recover this functionality: https://addons.mozilla.org/firefox/addon/savedsearchbutton/

  ^{Source: John99 solution in https://support.mozilla.org/questions/951511}

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  I'm totally new to dreamweaver CS4. I transferred my iweb in there site.

  
  In only 1 page (others have no problem) all look totally good text links until I put my cursor on it, then it changes to the blue brand question.

  The links work fine and I can say that all images and rollovers (png/jpg) files appear to be in the correct folders.

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  Thanks for your help in advance!
  Laja

  I don't know why I don't see in your first post. Who told you to use IMmouseover? It should be onmouseover

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  Hello

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  Do I need to assign an internal IP address (without static nat) and LAN2 in also an IP address in-house with NAT static external IP LAN1.

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  I'm just configuration conductor for the first time according to the guide found here:

  http://www.Cisco.com/c/dam/en/us/TD/docs/Telepresence/infrastructure/con...

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  I can't see anything in the guide on this subject...

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  Hello

  I was wondering if anyone can help me, im trying to QOS configuration for our new VOIP phone system, but im abit lost with the config, well really lost

  I use the CCP to configure and the QOS Wizard, but im not sure I'd be DSP or NBAR and also what are the percentages on the next page, I've attached a screenshot of the pages,

  any help on that would be great

  Paddi

  You don't want to police.  Percentages are based on the size of your circuit and how VoIP traffic you want to ensure.  By example, if you have a circuit of 20 MB/s and want to ensure 2 Mbps for VoIP the percentage would be 10%.

  If you are unsure, then I guess that just run with the default values suggested.

  Call mark DSCP traffic system (I hope)?  If so, use this option.

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