rsvp-te admission control - i don't see it

Łukasz Bromirski lukasz at
Thu Sep 3 19:44:31 UTC 2020


> On 3 Sep 2020, at 20:05, aaron1 at wrote:
> I have a functional mpls-te test running, seems fine…but, question about bandwidth reservations please.
> At the Headend router, I set bandwidth on my mpls-te tunnel, but I can’t for the life of me, find where in the network is this bandwidth actually being admitted, or seen, or allocated or anything!
> I mean I look on rsvp interfaces, I look in wireshark at the tspec field of the path message, I look in the mpls te tunnels along the way, etc, etc, I can’t find where the network sees that bandwidth I’m asking for at the tunnel Head end.

I’m not sure if I understand you, but RSVP only does control plane reservation.

Then, once you have a tunnel to establish with specific bandwidth required, RSVP-TE will do CSPF based on link coloring, bandwidth available over interfaces and priority of tunnel to decide how to establish it. If the tunnel is setup over interface, bandwidth assigned to tunnel is taken out from bandwidth available on that interface. But this is purely control plane reservation. Nothing will be enforced in data plane.

To enforce those values, you need to apply QoS policies to interfaces over which you expert to serve MPLS TE tunnels.

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