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

aaron1 at aaron1 at
Thu Sep 3 20:20:32 UTC 2020

Thanks, how do I see the control plane reservation?  I don’t seem to be seeing anything getting allocated 


RP/0/0/CPU0:r20#sh rsvp interface g0/0/0/1

Thu Sep  3 15:15:55.825 CST


*: RDM: Default I/F B/W % : 75% [default] (max resv/bc0), 0% [default] (bc1)


Interface                 MaxBW (bps)  MaxFlow (bps) Allocated (bps)      MaxSub (bps) 

------------------------- ------------ ------------- -------------------- -------------

GigabitEthernet0/0/0/1             1M             1M             0 (  0%)            0


RP/0/0/CPU0:r20#sh rsvp interface summary                       

Thu Sep  3 15:16:57.131 CST


Interface          MaxBW (bps) Allocated (bps) Path In Path Out Resv In Resv Out

------------------ ----------- --------------- ------- -------- ------- --------

Gi0/0/0/0                    0        0 (  0%)       1        0       0        1

Gi0/0/0/1                1000K        0 (  0%)       0        1       1        0





From: Łukasz Bromirski <lukasz at> 
Sent: Thursday, September 3, 2020 2:45 PM
To: aaron1 at
Cc: nanog at
Subject: Re: rsvp-te admission control - i don't see it



On 3 Sep 2020, at 20:05, aaron1 at <mailto: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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