Help Setting up QoS on 2808

Question

<> I am not a networking guru. I tried following the guide... and managed on my own to figure out how to Telnet in, activate the web control panel, and then access that via the web. Now here is what I am trying to do, it is not that complicated. We have a FIOS connection with 5 IPS: FIOS comes in as Ethernet, without DHCP. What I want to Plug into Ports on the Switch: 1) Uplink, to FIOS 2) VOIP PBX Router 3) Point of Sale System Router 4) Internal Network Router 5) Public Wifi Router 6-8: Not in use, wont be used ever Each is a separate segregated network, with its Own public IP.   I want to configure the switch to prioritize traffic in the following manner: By Port on the Switch. Port 2: VOIP: Always gets TOP/highest priority, then Port 3: PoS (Much less than the VOIP), then port 4: internal (even less important), then port 5: public wifi (least important). If someone could give me a quick howto, im sure I will be able to implement it. I thought a managed switch would be easier to setup... I'm sure I just do not understand most of the terminology in the menu. i have a lot of tech support, voip, phone system experience, but i have never used a managed switch before. Thanks

bh1633 · Answer

You want to configure quality of service. Look at the quality of service menus.

This switch has 4 output queues. This means you can set up to four priroity levels.

This switch can assign incoming packets to the queues based on vlan priority tag (802.1p COS in vlan tag) or Diffserv codepoint (DSCP in IP header). You need to decide how you are prioritizing traffic on your network (COS or DSCP) and set the switch to honor the correct one. (COS Settings page> Trust mode)

For setting all packets incoming on a port to a specific priority, use the Interface setting webpage, disable trust and set the COS value.

There are 2 ways to service the transmit queues WRR (all queues get serviced with decreased frequency with priority) or strict priority (high priroity traffic can starve lower priority queues). Look at CSO queue setting page.

You can map the COS or DSCP values to the switch transmit queues via the COS to Queue and DSCP to Queue pages.

I would suggest:

-you set via interace configuration page: port 2 to COS 4, port 3 to COS 3, port 4 to COS 2, port 5 to COS 1.

- set the mappings of COS to queue via the COS to Queue page to 1 to 1, 2 to 2, 3 to 3, 4 to 4,

- use the COS queue setting page to set queue 4 to strict priority and 3-1 to WRR. Set the WRR values to their defaults (4,2,1).

This should get you most of the way there. Good luck.

Jmc7385 · Answer

ok!

Here is what I did, following the above:

Setup from interface config page as described, making sure to Check "disable Trust" for interfaces 2-5.

Then I set the mapping of the queues. It had port 0 setup as queue 2 already. I put 0, 2, 6,7,8 all on queue 2??

Now here is where I was a little confused: Did I set the weight right?

QoS Queue Settings

Queue 1: WRR, Weight 4

Queue 2: WRR, weight 2

Queue 3: WRR, weight 1

Queue 4: Strict priority, no weight.

thanks a lot!!

bh1633 · Answer

The weights are opposite what you need. queue 3 shoul be 4, queue 2 should be 2, and queue 1 should be 1. The weight is the ratio of packets sent in each queue. So with this configuration if all the queues have packets in them:

- the switch would send Queue 4 until it was empty.

- send 4 packets from queue3

- send 2 packets from queue 2

- send 1 packet from queue 1

- sent 4 packets from queue 3

- send 2 packets from queue 2

- etc.

If at any time a packet came into queue 4, it would be sent immediately.

Networking General

Help Setting up QoS on 2808

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