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New Member

Qos minimun values in IOS XR

Hi,

Im using ASR9001 running IOS XR 4.2.3. I was trying to apply the following QOS configurations.

policy-map output-test

class match-5

  priority level 1

  police rate 32 kbps

  !

!

class match-3

  bandwidth  64 kbps

!

class match-1

  bandwidth  32 kbps

class class-default

!

end-policy-map

policy-map output-parent

class class-default

  service-policy output-test

  shape average 128 kbps

!

end-policy-map

While applying the above hierarchial QOS on the interface, the system is generating the following error.

"Minimum value for bandwidth configuration is 64 kbps"

Then I tried the bandwidth remaining percent for  the classess match-3 and match-5.

policy-map output-test

class match-5

  priority level 1

  police rate 32 kbps

  !

!

class match-3

  bandwidth remaining percent 66

!

class match-1

bandwidth remaining percent 34

  !

class class-default

!

end-policy-map

The configurations are accepted this time, but while observing the statistics, LLQ class (match-5) is allowed up to 66 kbps, but the configured value is 32 kbps. I reduced the police rate value to 8kbps (minimum configurable value in XR), but still the traffic is policed at 66 kbps.

Have anyone noticed this behavior on IOS XR?

Regards,

Darshak

  • XR OS and Platforms
2 REPLIES
New Member

Qos minimun values in IOS XR

What is the interface type, it will differ from one  to another ?

• Ingress Queueing Only

The smallest step size supported is 32 kbps for groups and 32/3 kbps (10.67 kbps) for queues. Step size

increases with the rate value. Rounding error does not exceed 0.4 per cent or 8 kbps, whichever is higher.

• Egress Queueing Only

The smallest step size supported is 8 kbps for 10 gigabit interfaces and 64 kbps for 100 gigabit interfaces

for queues and groups. Step size increases with the rate value. Rounding error does not exceed 0.4 per

cent or 8 kbps, whichever is higher.

New Member

Qos minimun values in IOS XR

Im using one Gig interface (A9K-MPA-20X1GE)

interface GigabitEthernet0/0/0/1.200

mtu 1518

  service-policy output output-parent

vrf test

ipv4 address 192.168.200.1 255.255.255.252

encapsulation dot1q 200

Is there any limitation on one Gig as well?

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