Switching

Hi Guys,

We have a 3200 EX switch and we want to configure the QoS on it. How we will configure the switch with 4 VLANS for Data/Voice/Mail/Video. We want our switch to prioritize our Video per VLAN.

Kindly help me to have a brief explanation and sample configuration procedure to make our setup possible.

Thanks,

Charm

Hi Charm

You will find a lot of documents on the Juniper Web site

Some interesting PDF on QOS on the EX series:

Theory: 

 http://www.juniper.net/us/en/local/pdf/whitepapers/2000255-en.pdf

and how to configure:

http://www.juniper.net/us/en/local/pdf/implementation-guides/8010010-en.pdf

HTH 

I think the best way to add qos to your config is with a firewall-rule that you configure on the VLAN.  Then you use rewrite rules to definitly mark the packets.  At the uplink-ports to other switches you can give certain priority based on the rewrite rules. With junos 9.3 or higher the rewrite-rules has to be configured on the interfaces explicetly.

Hi Guys, let me alter my question: Can I configure the QoS per VLAN? For example I have 4 VLANs in my EX-Series VLAN-Voice, VLAN-Video, VLAN-Data, and VLAN-Email what configuration can you recommend if my priority is the Voice?

Hi Charm,

I can work for you by bulding and testing a sample config as I already did , but since you posts your answers after a while and don't see usefull to say when you've been helped, by cliking the Kudos or the solved button, I am not sure I will waste my time helping you !

Hi Loup2,

I think should learn a little more using this forum. Apologize if not answering back, kindly give me suggestion using this forum. Like when to use Kudos that you are saying. It may seems that I dont care to all replies to my posting but believe me I really appreciate them.

Hi,

Let me try to explain a little bit:

You can classify the traffic on the VOICE vlan with this firewall filter:

family ethernet-switching {

    filter Voice {

        term All_voice {

            then {

                forwarding-class expedited-forwarding;

                loss-priority low;

            }

        }

    }

}

You can apply this filter to the Voice VLAN:

VOICE_VLAN {

    vlan-id 2;

    filter {

        input Voice;

    }

}

With this config the traffic will be classified in queue expedited-forwarding instead of 

best effort

Alain@EX3200_Sam> show interfaces queue ge-0/0/3    

Physical interface: ge-0/0/3, Enabled, Physical link is Up

  Interface index: 132, SNMP ifIndex: 149

Forwarding classes: 16 supported, 4 in use

Egress queues: 8 supported, 4 in use

Queue: 0, Forwarding classes: best-effort 

  Queued:

    Packets              : Not Available  

    Bytes                : Not Available  

    Packets              :                 10026

    Bytes                :               1022614

    Tail-dropped packets :                     0

Queue: 1, Forwarding classes: assured-forwarding 

  Queued:

    Packets              : Not Available  

    Bytes                : Not Available  

    Packets              :                     0

    Bytes                :                     0

    Tail-dropped packets :                     0

Queue: 5, Forwarding classes: expedited-forwarding 

  Queued:

    Packets              : Not Available  

    Bytes                : Not Available  

    Packets              :                 10000

    Bytes                :               1020000

    Tail-dropped packets :                     0

Queue: 7, Forwarding classes: network-control 

  Queued:

    Packets              : Not Available  

    Bytes                : Not Available  

    Packets              :                   994

    Bytes                :                187345

    Tail-dropped packets :                     0

All the other VLAN will leave traffic with default classification (queue 0)

This has been tested and works on EX3200 in V9.5R1.8 on a layer 2 VLAN (without routing) 

I hope this little explanation will help you

charm,

No you can not classify based on the VLAN id, you will need to be more specific with your COS config.

Presumably traffic within your Voice VLAN goes to a set/known number of IP addresses? if so then you classify traffic as "voice" based on it having a destination of those IP Addresses. 

An alternative is to use DSCP markings or 802.1p bits when traffic initially enters a VLAN and then classify based on those bits. 

An example of the first method is here:

http://www.juniper.net/techpubs/en_US/junos9.5/topics/example/cos-ex-series-configuring.html