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

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1

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.

Using IOS-XR in EVE-NG for testing. XR 6.3.1

I’ll give you other details if you want them.

Aaron

aaron1@gvtc.com

2

Aaron,

3

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

-Aaron

4

You will only see allocations once you have TE tunnels (sessions) actually setup. Without tunnels setup, but RSVP-TE enabled on the interfaces, all you will see the maximum bandwidth that RSVP-TE can allocate across said interfaces. Remember that RSVP-TE is purely control plane. So it doesn’t matter if you signal an LSP with 10Mbps or 10Gbps. It will not determine whether a link (or LSP) will actually pass 10Mbps or 10Gbps worth of traffic. It’s just a reference. Back when I used to RSVP-TE, I’d signal 10Gbps links as 10Mbps. That gave me plenty of granularity to scale up without having an unwieldy configuration. Mark.

5

Thanks Mark, I have a tunnel traversing those interfaces. Customer routers (r10, r30) can ping end to end via tunnel.

Not sure if I’m missing something here. I wonder if I’m not signaling for the rsvp bandwidth correctly. I just don’t see any allocated bandwidth in the rsvp interfaces anywhere.

Here’s one of the transit routers… r24…. Should I see “allocated (bps)” here ?

RP/0/0/CPU0:r24#sh rsvp int

Fri Sep 4 10:54:16.451 CST

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

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

GigabitEthernet0/0/0/0 750M* 750M 0 ( 0%) 0*

GigabitEthernet0/0/0/1 750M* 750M 0 ( 0%) 0*

Details….

LSP/TE-tunnel has dynamic path option, but I disallow it to flow via r21… so tunnel takes the southbound path via r20-24-r25-r23-r22

(2) unidirectional te-tunnels

r20 is headend and r22 is tailend r20---->r22

r22 is headed and r20 is tailend r22---->r20

R10 R30

r20-----r21-----r22

r24-----r25-----r23

r20’s tunnel…

RP/0/0/CPU0:r20#sh mpls traffic-eng tun br

Fri Sep 4 10:59:51.509 CST

TUNNEL NAME DESTINATION STATUS STATE

tunnel-te1 10.20.0.22 up up

r22—>r20 10.20.0.20 up up

Displayed 1 (of 1) heads, 0 (of 0) midpoints, 1 (of 1) tails

Displayed 1 up, 0 down, 0 recovering, 0 recovered heads

RP/0/0/CPU0:r20#sh mpls traffic-eng tun name tunnel-te1 | be count

Fri Sep 4 10:59:54.309 CST

Node hop count: 4

Hop0: 10.20.1.21

Hop1: 10.20.1.18

Hop2: 10.20.1.17

Hop3: 10.20.1.14

Hop4: 10.20.1.13

Hop5: 10.20.1.10

Hop6: 10.20.1.9

Hop7: 10.20.0.22

Displayed 1 (of 1) heads, 0 (of 0) midpoints, 0 (of 1) tails

Displayed 1 up, 0 down, 0 recovering, 0 recovered heads

r22’s tunnel….

RP/0/0/CPU0:r22#sh mpl tr tun br

Fri Sep 4 10:25:32.668 CST

TUNNEL NAME DESTINATION STATUS STATE

tunnel-te1 10.20.0.20 up up

r20—>r22 10.20.0.22 up up

Displayed 1 (of 1) heads, 0 (of 0) midpoints, 1 (of 1) tails

Displayed 1 up, 0 down, 0 recovering, 0 recovered heads

RP/0/0/CPU0:r22#sh mpl tr tun name tunnel-te1 | be count

Fri Sep 4 10:25:35.858 CST

Node hop count: 4

Hop0: 10.20.1.10

Hop1: 10.20.1.13

Hop2: 10.20.1.14

Hop3: 10.20.1.17

Hop4: 10.20.1.18

Hop5: 10.20.1.21

Hop6: 10.20.1.22

Hop7: 10.20.0.20

Displayed 1 (of 1) heads, 0 (of 0) midpoints, 0 (of 1) tails

Displayed 1 up, 0 down, 0 recovering, 0 recovered heads

X = router number

10.20.0.0/16

10.20.0.X/24 - loopbacks

10.20.1.0/24 – /30’s between routers

(numbered clockwise, lowest to highest, start at r20)

(r20 is .1 , r21 is .2 , r21 is .5 , etc)

10.20.1.0/30 – r20—r21

10.20.1.4/30 – r21—r22

10.20.1.8/30 – r22—r23

10.20.1.12/30 – r23—r25

10.20.1.16/30 – r25—r24

10.20.1.20/30 – r24—r20

r10#sh ip int br | in up

GigabitEthernet3 1.0.0.2 YES manual up up

RP/0/0/CPU0:r30#sh ip int br | in Up

GigabitEthernet0/0/0/2 1.1.1.2 Up Up default

r10#trace 1.1.1.2

Type escape sequence to abort.

Tracing the route to 1.1.1.2

VRF info: (vrf in name/id, vrf out name/id)

1 1.0.0.1 23 msec 5 msec 7 msec

2 10.20.1.21 [MPLS: Labels 24000/24010 Exp 0] 43 msec 50 msec 40 msec

3 10.20.1.17 [MPLS: Labels 19/24010 Exp 0] 49 msec 42 msec 41 msec

4 10.20.1.13 [MPLS: Labels 24001/24010 Exp 0] 42 msec 46 msec 46 msec

5 10.20.1.9 42 msec 38 msec 34 msec

6 1.1.1.2 55 msec * 44 msec

RP/0/0/CPU0:r30#traceroute 1.0.0.2

Fri Sep 4 15:25:10.129 UTC

Type escape sequence to abort.

Tracing the route to 1.0.0.2

1 1.1.1.1 29 msec 0 msec 0 msec

2 10.20.1.10 [MPLS: Labels 24000/24009 Exp 0] 49 msec 49 msec 49 msec

3 10.20.1.14 [MPLS: Labels 20/24009 Exp 0] 39 msec 49 msec 39 msec

4 10.20.1.18 [MPLS: Labels 24001/24009 Exp 0] 49 msec 39 msec 49 msec

5 10.20.1.22 49 msec 49 msec 39 msec

6 1.0.0.2 69 msec * 49 msec

RP/0/0/CPU0:r30#

6

What’s the signalled bandwidth being reserved by the headend “R20” in your example? it’s a hunch that you may not have that defined and it becomes Zero bandwidth LSPs.

7

Thanks dip, let me know what you think.

r20 is headend and r22 is tailend r20---->r22

r22 is headed and r20 is tailend r22---->r20

RP/0/0/CPU0:r20#sh run int tt1

Fri Sep 4 12:25:09.198 CST

interface tunnel-te1

bandwidth 200000

ipv4 unnumbered Loopback0

signalled-name r20—>r22

autoroute announce

!

destination 10.20.0.22

path-option 10 dynamic

RP/0/0/CPU0:r22#sh run int tt1

Fri Sep 4 11:50:01.581 CST

interface tunnel-te1

bandwidth 200000

ipv4 unnumbered Loopback0

signalled-name r22—>r20

autoroute announce

!

destination 10.20.0.20

path-option 10 dynamic

8

can you try this https://www.cisco.com/c/en/us/td/docs/ios_xr_sw/iosxr_r3-7/mpls/command/reference/gr37mpte.html#wp2134470

9

That’s it! Thanks dip

Using “signalled-bandwidth 5000” on headend te-tunnel int

RP/0/0/CPU0:r20#sh run int tt1

Fri Sep 4 13:27:14.833 CST

interface tunnel-te1

bandwidth 200000

ipv4 unnumbered Loopback0

signalled-name r20—>r22

signalled-bandwidth 5000

autoroute announce

!

destination 10.20.0.22

path-option 10 dynamic

!

On HE…

RP/0/0/CPU0:r20#sh mpls traffic-eng tunnels name r20—>r22 | in and

Fri Sep 4 13:28:28.918 CST

Name: tunnel-te1 Destination: 10.20.0.22 Ifhandle:0x1d0

Bandwidth Requested: 5000 kbps CT0

Bandwidth: 5000 kbps (CT0) Priority: 7 7 Affinity: 0x0/0xffff

RP/0/0/CPU0:r20#sh rsvp reservation detail | in ate

Fri Sep 4 13:25:51.509 CST

Rate: 0 bits/sec. Burst: 1K bytes. Peak: 0 bits/sec.

State expires in 0.000 sec.

Rate: 5000000 bits/sec. Burst: 1K bytes. Peak: 5M bits/sec.

State expires in 358.630 sec.

RP/0/0/CPU0:r20#sh rsvp int

Fri Sep 4 13:26:03.738 CST

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

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

GigabitEthernet0/0/0/0 750M* 750M 0 ( 0%) 0*

GigabitEthernet0/0/0/1 750M* 750M 5M ( 0%) 0*

On transit lsr in core…

RP/0/0/CPU0:r24#sh rsvp session detail | in ate

Fri Sep 4 13:18:25.258 CST

Tspec: avg rate=0, burst=1K, peak rate=0

Fspec: avg rate=0, burst=1K, peak rate=0

Tspec: avg rate=5M, burst=1K, peak rate=5M

Fspec: avg rate=5M, burst=1K, peak rate=5M

RP/0/0/CPU0:r24#sh rsvp int

Fri Sep 4 13:18:33.508 CST

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

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

GigabitEthernet0/0/0/0 750M* 750M 0 ( 0%) 0*

GigabitEthernet0/0/0/1 750M* 750M 5M ( 0%) 0*