DSCP marking for servers

[dan.letkeman]

Hello,

I'm wondering what the correct process would be to mark traffic for say an snmp monitoring server.  I have some links that get over utilized regularly and my snmp traffic cannot make it through and gives me false positives.  I have set the snmp-server ip dscp xx on the switches and I can see that the markings are happening and going out of the switch.

!

snmp-server ip dscp 30

!

  dscp: outgoing

-------------------------------

  0 -  4 :   172300578            0            0            0           74

  5 -  9 :           0            0            0            0            0

10 - 14 :           0            0            0            0            0

15 - 19 :           0            0            0            0            0

20 - 24 :           0            0            0            0            0

25 - 29 :           0            0            0            0            0

30 - 34 :       16853            0            0            0            0

35 - 39 :           0            0            0            0            0

40 - 44 :           0            0            0            0            0

45 - 49 :           0            0            0         3516            0

50 - 54 :           0            0            0            0            0

55 - 59 :           0            0            0            0            0

60 - 64 :           0            0            0            0

So the marking is happening and the traffic is prioritized.  Now, what I think is happening is that the snmp server is not getting its requests to the switch because the link is over utilized.  So I need to mark the traffic on the server end?  This server is on a VMWare host, and I am wondering what the best process is to mark traffic from a guest vm server connected to a 3560?

Set the dscp marking on the server itself and then just trust dscp on the trunk port to the vmware host?  Or mark the traffic on the switch using a policy map?

Thanks,

Dan.

[Reza Sharifi]

Hi,

Maybe you can try something like this:

The default COS coming from the guest vm server is 0 (default).  Now, on the uplink port on your 3560, you can try rewriting the COS using:

switchport priority extend cos 5

and see if this helps.

HTH

[dan.letkeman]

Hmmm, don't think I want to do that because there are many more guests on that host and that would mean that all of the guests traffic is marked with cos 5.