Solved: ASR9000 QoS on Subinterfaces. Use individual Policies - Page 2

victor.lyapunov · ‎12-29-2014

Hello

I need some help tounderstand how QoS works in ASR9K and the capabilities it offers.

Typically We terminate multiple metro ethernet clients at Gigabit interfaces (each client having a dedicated subinterface of his own)
We need to apply for each subinterface shaping + bandwidth reservation according to the client needs.

One way is have a policy applied to the GigE interface with multiple classes that match individual vlan-ids for each subinterface. But I am
afraid that this approach will soon lead to very big policies that are difficult to maintain.

Is is possible to create individual policies - one for each client, that :
- will be applied to the corresponding subinterfaces
- In case of congestion in the major interface will ensure that the bandwidth is allocated according to the rates defined in each policy

For example if we have three clients / subinterfaces:

interface Bundle-Ether30002.100
service-policy output CLIENT_100
ipv4 address 10.0.100.1 255.255.255.252
encapsulation dot1q 100
!
interface Bundle-Ether30002.101
service-policy output CLIENT_101
ipv4 address 10.0.101.1 255.255.255.252
encapsulation dot1q 101
!
interface Bundle-Ether30002.102
service-policy output CLIENT_102
ipv4 address 10.0.102.1 255.255.255.252
encapsulation dot1q 102
!
!
!
policy-map CLIENT_100
class CLIENT_100
shape average 500 mbps
bandwidth remaining ratio 50
!
end-policy-map
!
policy-map CLIENT_101
class class-default
shape average 500 mbps
bandwidth remaining ratio 30
!
end-policy-map
!
policy-map CLIENT_102
class class-default
shape average 500 mbps
bandwidth remaining ratio 20
!
end-policy-map
!

I would like to make sure that during congestion in the major interface, the remaining bw is allocated to each subinterface
according to CLIENT 100 = 50%, CLIENT 101 = 30%, CLIENT 102 = 20% using policies that are applied on the subinterfaces.
- Is there any way to achieve this or the only solution is use a hierarchical policy in the major interface?
(The config above does not work as intented the traffic will be equally allocated among the three subinterfaces)

I have seen in the documentation refering to service-fragments but have not been able to test them. Can they help me in this
setup?

Thank you

Aleksandar Vidakovic · ‎01-31-2018

hi Sumanta,

yes, that's when the system will report an error.

/Aleksandar

Sumanta Ghosh · ‎02-01-2018

Hi Alexander

Thanks. Can you assist with the final CLI? I am getting this error.

interface TenGigE0/0/0/15.2338
service-policy output to_egress
!!% 'qos-lib' detected the 'warning' condition 'MQC: Shape bandwidth rate is less than mininum bandwidth'
!
end

policy-map to_egress
description ***Outbound policy map for uplink***
class class1
shape average 50 mbps
bandwidth percent 5
!
class class2
shape average 100 mbps
bandwidth percent 10
!
class class3
shape average 100 mbps
bandwidth percent 10
!
class class4
bandwidth remaining percent 30
!
class class5
bandwidth remaining percent 30
!
class class6
bandwidth remaining percent 30
!
class class-default
bandwidth remaining percent 10
!
end-policy-map
!

Regards,

Sumanta.

Aleksandar Vidakovic · ‎02-05-2018

'MQC: Shape bandwidth rate is less than mininum bandwidth'

shape average 50 mbps
bandwidth percent 5 ---> this is 5% of TenGigE interface bandwidth, i.e. 500Mbps

So you want to guarantee 500Mbps to this class, but at the same you are limiting the rate to 50Mbps. This is contradictory.

Sumanta Ghosh · ‎02-06-2018

Hi Alex

Thanks. I had given bandwidth cmd set to 1000 Mbps on TenGigE port. Is it not enough to influence the QoS shaping? Do we need parent-child hierarchy?

Regards,

Sumanta.

Aleksandar Vidakovic · ‎02-06-2018

You need to configure explicitly the parent shaper/policer rate if you want to cap the max traffic rate on a (sub)interface and have that value be the visible bandwidth at child level.

Sumanta Ghosh · ‎02-06-2018

Hi Alex

Thanks. Do you have any example of this I can follow?

Sumanta.

Aleksandar Vidakovic · ‎02-08-2018

by all means. Here's an example of a hierarchical policy that you can use on asr9k:

policy-map parent
 class class-default
  service-policy child
  shape average 100 mbps
  bandwidth remaining ratio 30
  bandwidth 50 mbps
 !
end-policy-map
!
policy-map child
 class Voice
  priority level 1
  police rate percent 5
 !
 class V4-PACKET-IS-AF23
  bandwidth percent 30
 !
 class V4-PACKET-IS-AF31
  bandwidth percent 20
 !
 class V4-PACKET-IS-AF41
  bandwidth percent 40
 !
 class class-default
 !
end-policy-map
!

BW and BRR at parent level are relevant if you have multiple sub-interfaces on the same physical interface and want to influence the BW allocation between them.

Sumanta Ghosh · ‎02-13-2018

Hi Alex

Please see below. I think apart from class-1, all others are matching. We apply the parent policy to the TenGigE interface on ASR. Let me know what do you think of this, please. The interface runs labelled e-BGP with inter-AS option B.

class-map match-any class1
match dscp 54 51
match mpls experimental topmost 7
end-class-map
!
class-map match-any class2
match dscp 48 40 32
match mpls experimental topmost 6
end-class-map
!
class-map match-any class3
match dscp 46 34 36 38
match mpls experimental topmost 5
end-class-map
!
class-map match-any class4
match dscp 26 28 16 8
match mpls experimental topmost 4
end-class-map
!
class-map match-any class5
match dscp 18 20 22
match mpls experimental topmost 3
end-class-map
!
class-map match-any class6
match dscp 10 12 14
match mpls experimental topmost 2
end-class-map
!

policy-map to_peer_egress
description ***Outbound policy map for peer uplink***
class class1
bandwidth percent 5
!
class class2
bandwidth percent 20
!
class class3
bandwidth percent 20
!
class class4
bandwidth percent 10
!
class class5
bandwidth percent 10
!
class class6
bandwidth percent 10
!
class class-default
bandwidth percent 5
!
end-policy-map
!
policy-map to_egress_parent
description ***Outbound parent policy map for peer uplink***
class class-default
service-policy to_egress
shape average 1 gbps
bandwidth 1 gbps
!
end-policy-map

Regards,

Sumanta.

Aleksandar Vidakovic · ‎02-14-2018

Hi Sumanta,

sorry, I didn't quite understand what you wanted me to check. Can you clarify?

/Aleks

rohandec1980 · ‎07-20-2015

Hi Victor

So what does your final configuration look like? I am having the same issue, although I am not using bandwidth reservation.

Regards

Rohan

Sumanta Ghosh · ‎02-15-2018

Hi Alex

Thanks. I just wanted to verify that the config looks ok to you or we need to change it.

Cheers,

Sumanta.