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Per-Tunnel QoS and sharing of bandwidth between VRF-enabled DMVPN spoke-routers

Hi there,

I was wondering if there is any elegant solution that allows to share the available download bandwidth (hub to spoke) of a spoke site between multiple VRFs on a DMVPN spoke router.

The scenario is as follows:

Each of my spoke routers implements multiple VRFs that should share the available site bandwidth.

In the upload direction this can be easily* achieved by binding the QoS policy to the physical interface towards the provider the DMVPN tunnels are built over.

However, in the other direction, namely hub-to-spoke, it get's more complicated.

If the per-tunnel QoS for DMVPN feature is implemented on a per tunnel basis, I would either have to allocate the overall spoke bandwidth between the different VRFs or potentially oversubscribe by instructing the hub that the available bandwidth of each of the VRF-specific tunnels towards the spoke equals to the whole spoke bandwidth.

It seems that the only possible way to achieve the utilization of the per-tunnel QoS feature so that the spokes bandwidth is shared between multiple VRFs is to build an additional "underlay" DMVPN that acts as the transport for the other VRF-specific DMVPNs.

Simplified illustration:

Provider Transport {

   Underlay DMVPN (Transport for VRF-specific DMVPNs) {

      VRFa-DMVPN

      VRFb-DMVPN

      VRFc-DMVPN

   }

}

I'm also wondering if IWAN (PfR) would work in such a scenario, i.e. DMVPN (VRF-specific, PfR controlled) over DMVPN (transport).

Any feedback or ideas are highly appreciated :-)


Bfn,

Stephan

*There is also no means of control for spoke-to-spoke traffic not to potentially oversubscribe other spokes with lower access bandwidths.

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VIP Advisor

You are correct - there is no

You are correct - there is no elegant way to do this.

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