Configure QoS on C3 SecureStack to prioritize video/voice traffic.

[Joshua_Sanders]

I have a DR site connected to my corporate office. The DR site is using a older C3G Securestack. The corporate office is using a N7 switch with platinum DFEs.

My question is how do I configure QoS. The config guide and feature guide on the Extreme website might as well be in ancient Babylonian. It doesn't make any sense to me. All I'm trying to do is ensure VoIP traffic and my video conference system gets first priority. If the video conference system is tagging packets as EF, why can't I just create an access-list in the (router) like this and assign it to a vlan interface.

access-list 100 permit ip any any dscp ef assign-queue 5
access-list 100 permit ip any any assign-queue 4

I this should work but I never lose my jitter on the video system and the Enterasys documentation doesn't ever seem to offer this as an example.

[Curtis_Parish1]

You probably have congestion somewhere. Unless you have a huge WAN connection or you generating a lot of traffic locally, I doubt the C3 is the source of your bottleneck. A couple of things you can look at on the C3 is CPU utilization and the amount of broadcast traffic. Firewalls, routers, and WANs are usually the bottlenecks.

[Joshua_Sanders]

Well, if I'm seeing jitter on my system that would indicate congestion no?

[Curtis_Parish1]

Remember QOS does not really "kick in" until there is congestion on the switch. WANs and choke points are where QOS really helps.

[Erik_Auerswald]

Hi,

did you see the command
set cos state enablein the above (it was appended to the preceding line and could be overlooked). This is needed for re-marking.

The C3 prioritizes on the CoS bits by default. The policy in the above re-marks inbound frames with CoS 6. This policy is used if it is bound to a port or user. That could be accomplished using
set policy port PORTSTRING POLICY_IDIn the example above, PORTSTRING was ge.1.4 and POLICY_ID was 1.

You might be interested in one of the following GTAC Knowledge articles:

• How To Configure Policy to Mark Voice/video/data with specific Markings on Securestack and S-Series
• Prioritizing ShoreTel Connect VoIP traffic on SecureStacks
• How To Priortize All Traffic in a VLAN by Setting the P-Bit on Securestack and S-Series
• How to verify Quality of Service (QoS) configuration is working on EOS products

The QoS documentation is indeed hard to read, because it describes a complex system in just a few pages.

Erik

[Joshua_Sanders]

Where in this is the prioritization happening? I entered what you gave me (except I used policy index 8 and called it "video" but I'm still seeing about 20ms of jitter and a large amount of packet loss on the video conference system plugged into ge.1.4