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LLQ Over Tunnel Interface

Hi,

I have the below config:

!

class VOIP

match protocol rtp

policy-map QOS

class VOIP

  priority 64

!

interface Tunnel255
  ip address 10.255.255.4 255.255.255.0
  ip nhrp authentication UbSmEbK
  ip nhrp map 10.255.255.1 172.80.2.2
  ip nhrp network-id 255
  ip nhrp nhs 10.255.255.1
  keepalive 10 3
  tunnel source Ethernet0
  tunnel destination 172.80.2.2
  tunnel key 255

!

When I tru to apply the policy-map on the tunnel interface (service-policy output QOS) i am getting the following error:

"Low Latency Queueing feature is not supported in user defined class of parent level policy"

Any idea?

1 ACCEPTED SOLUTION

Accepted Solutions

Re: LLQ Over Tunnel Interface

I could be wrong but i dont think you could apply a service policy on a tunnel interface for LLQ without shaping!

Instead, you need to apply a hierarchical policy. Create a "child" or lower-level policy that configures a queueing mechanism, such as low latency queueing with the priority command and class-based weighted fair queueing (CBWFQ) with the bandwidth command.

Create a "parent" or top-level policy that applies class-based shaping. Apply the child policy as a command under the parent policy because admission control for the child class is done according to the shaping rate for the parent class.


see http://www.cisco.com/en/US/docs/ios/12_4/interface/configuration/guide/inb_tun.html#wp1078284

3 REPLIES

Re: LLQ Over Tunnel Interface

I could be wrong but i dont think you could apply a service policy on a tunnel interface for LLQ without shaping!

Instead, you need to apply a hierarchical policy. Create a "child" or lower-level policy that configures a queueing mechanism, such as low latency queueing with the priority command and class-based weighted fair queueing (CBWFQ) with the bandwidth command.

Create a "parent" or top-level policy that applies class-based shaping. Apply the child policy as a command under the parent policy because admission control for the child class is done according to the shaping rate for the parent class.


see http://www.cisco.com/en/US/docs/ios/12_4/interface/configuration/guide/inb_tun.html#wp1078284

Re: LLQ Over Tunnel Interface

How i got mine to work without this error "*Mar  1 00:22:29.695: Class Based Weighted Fair Queueing not supported on interface Tunnel0"

class-map match-all VOIP
match protocol rtp
!
!
policy-map QOS1 (child policy)
class VOIP
  priority 64

policy-map QOS   (Parent top level policy)
class class-default
  shape average 2000000
  service-policy QOS1

interface Tunnel0
service-policy output QOS

New Member

Re: LLQ Over Tunnel Interface

Thanks, direct hit

Another question, I sourced a tunnel interface from a point-to-point frame relay interface, but the tunnel never came up.

Any idea why!!

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