Priority queue on Tunnel interface

[Utair Corporation]

Hi. I need to set priority queue on tunnel interface, to make some traffic class served first, the other one next and remaining the last.

I understand what i should create shaping policy map to specify tunnel bandwidth, but what's next?

[paolo bevilacqua]

I would not really even begin trying this, chances are will newer work. In most cases the outbound interface is ethernet and never experiences congestion, so there is to do a nested pologu, DSPC bits copying and way too many things, creating instability and never ending maintenance.

Tunnell == Internet == No QoS

Don't expect that you can change the above.

[Utair Corporation]

Tunnell == Internet == No QoS

Who said about Internet?

It's a guaranteed 5 mbit/s link.

[Mohamed Sobair]

Hi,

You can Certainely do that. You need to specify (QoS pre-classify) on the tunnel interface, classify and mark as close to the source as possible and apply your QoS at the Outgoing Interface (The Source Of the Tunnel Interface). and you should be good to go.

Again, just make sure thier is marking honored ONLY for your tunnel destination before the tunnel establishment,

After the tunnel is established, you dont need the Service Provider involvemnet at all, you can do and implement all your QoS policy over the Tunnel.

Regards,

Mohamed

[Utair Corporation]

You can Certainely do that. You need to specify (QoS pre-classify) on the tunnel interface, classify and mark as close to the source as possible and apply your QoS at the Outgoing Interface (The Source Of the Tunnel Interface). and you should be good to go.
Again, just make sure thier is marking honored ONLY for your tunnel destination before the tunnel establishment,
After the tunnel is established, you dont need the Service Provider involvemnet at all, you can do and implement all your QoS policy over the Tunnel.

Alright then. How to implement priority queue at outbound interface? Considering marking DiffServ at incoming interfaces.

Is there a policy-map style commands for that?

[shehzadtesleem]

Hi;

It works either you apply on source interface or even on tunnel interface; below is the configuration I am using for this.

class-map match-any VC
match access-group name VC
class-map match-any ERP
match access-group name ERP

policy-map QOS

class VC
    priority 768
class ERP
    bandwidth 640

interface Tunnel2

service-policy output QOS

ip access-list extended VC
permit ip host 197.82.184.240 any

[Utair Corporation]

shehzadtesleem wrote:
Hi;
It works either you apply on source interface or even on tunnel interface; below is the configuration I am using for this.
class-map match-any VC
 match access-group name VC
class-map match-any ERP
 match access-group name ERP
policy-map QOS
 class VC 
    priority 768
 class ERP
    bandwidth 640
interface Tunnel2
service-policy output QOS
ip access-list extended VC
 permit ip host 197.82.184.240 any

could you explain alittle?

you set priority 768. as i understand it is some guaranteed bandwidth, but where does it know total bandidth? does it need to?

[shehzadtesleem]

Hi;

You can apply shaping like this suppose you have 2 Mb link

policy-map QOS

class VC
    priority 768
class ERP
    bandwidth 640

policy-map QOS_PROFILE
class class-default
    shape average 2048000
  service-policy QOS

interface Tunnel2

service-policy output QOS_PROFILE

[Kishore Chennupati]

hi,

you can also the " bandwidth " statement on the tunnel interface.

Regards

Kishore

[Utair Corporation]

kishore.chennupati wrote:
hi,
you can also the " bandwidth " statement on the tunnel interface. 
Regards
Kishore

i thought it used for EIGRP metrics only

[shehzadtesleem]

Yes, bandwidth command is for metric calculation of EIGRP, OSPF etc

[Utair Corporation]

Okay, here is what i'm thinking of:

class-map match-any CITRIX
 match access-group name CITRIX
class-map match-any VIDEO
 match access-group name VIDEO
class-map match-any VOICE
 match access-group name VIDEO
!
policy-map QoS
 class VOICE
  priority percent 10
 class VIDEO
  priority percent 70
 class CITRIX
  priority percent 10
!
policy-map INTERFACE
 class class-default
  shape average 4800000
  service-policy QoS
!
interface Tunnel0
 qos pre-classify
!
interface Vlan10
 service-policy output INTERFACE
!

Will that leave only 10% of bandwidth to class-default traffic, no matter what load in another classes? Or will it decrease and leave available bandwidth to 10% when there is full load in non default classes?

What's the difference between "priority" and "bandwidth" policy commands?

Also, what about CPU load? it is 2811 router with several other WAN connections.

[shehzadtesleem]

Dear

it will decrease and leave available bandwidth to 10% when there is full load in non default classes is correct statement.

2ndly you can apply priority to only one class.

kindly read LLQ and CBWFQ  for more details to see the difference between priority and bandwidth.

The Low Latency Queueing feature brings strict priority queueing to Class-Based Weighted Fair Queueing (CBWFQ) when we define a class with priority command.

HTH

SK

[Kishore Chennupati]

hi shehzad,

2ndly you can apply priority to only one class.
kindly read LLQ and CBWFQ  for more details to see the difference between priority and bandwidth.
The Low Latency Queueing feature brings strict priority queueing to Class-Based Weighted Fair Queueing (CBWFQ) when we define a class with priority command.

Priority statement can be applied to more than one class. Priority has a inbuilt policer which doesn't let it go beyond what you have configured for the class. So, you can have priority for Voice class and for also Video class seperately.

please find below an example that have put here for your reference.

r5#sh policy-map

  Policy Map POL

    Class VC1

      Strict Priority

      Bandwidth 10 (kbps) Burst 250 (Bytes)

    Class VC2

      Strict Priority

      Bandwidth 20 (kbps) Burst 500 (Bytes)

HTH,

Regards,

Kishore

Please rate if helpful

[shehzadtesleem]

Hi Kishore;

2ndly you can apply priority to only one class.

My apologize for the above statement, yes you can define more than one classed to apply the priority