Solved: LLQ Over Tunnel Interface

jad.sadek · ‎03-16-2010

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?

francisco_1 · ‎03-16-2010

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

View solution in original post

francisco_1 · ‎03-16-2010

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

francisco_1 · ‎03-16-2010

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

jad.sadek · ‎03-16-2010

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!!