11-23-2012 01:53 AM - edited 03-07-2019 10:12 AM
I have a Cisco 8510msr that is connected back to back with a 7206vxr across a 155Meg connection.
I receive lots of Output drops on the 7206vxr interface facing the atm switch.
When I do the following command:-
kwdair9#sh atm int atm 1/0
Interface ATM1/0:
AAL enabled: AAL5 , Maximum VCs: 4096, Current VCCs: 27
Maximum Transmit Channels: 0
Max. Datagram Size: 4528
PLIM Type: SONET - 155000Kbps, TX clocking: LINE
Cell-payload scrambling: ON
sts-stream scrambling: ON
797522 input, 881483 output, 203946630 IN fast, 223768062 OUT fast, 0 out dropVBR-NRT : 110288
Avail bw = 44712 <==== I only have 44meg
Config. is ACTIVE
kwdair9#
I only get 44Meg of the available 155Meg.
There is no QOS on the router and the only commands I can find that vaguely see that refer to QOS are on the ATM switch:-
atm address 47.0091.8100.0000.0007.0d87.b201.0007.0d87.b201.00
atm router pnni
no aesa embedded-number left-justified
node 1 level 56 lowest
redistribute atm-static
Can anyone suggest why this is acting like a DS3 link and not a 155Meg link??
11-23-2012 01:36 PM
Hi,
It is likely that you have configured some atm pvc at your 7206vxr box with the guaranteed cell rate (e.g. vbr-nrt service category). Will you please post the "show atm vc" command output (issued at 7206vxr router).
Best regards,
Antonin
11-26-2012 02:07 AM
kwdair9#kwdair9#sh atm vc
VCD / Peak Avg/Min Burst
Interface Name VPI VCI Type Encaps SC Kbps Kbps Cells Sts
1/0.26 gardner-bdc 1 32 PVC SNAP VBR 1920 1920 94 UP
1/0.28 geaviation-b 1 33 PVC SNAP VBR 6000 6000 94 UP
1/0.29 bdc-baesys 1 34 PVC SNAP VBR 3000 3000 94 UP
1/0.32 bdc-quest 1 35 PVC SNAP VBR 10000 10000 94 UP
1/0.31 bdc-wsatkins 1 36 PVC SNAP VBR 8000 8000 94 UP
1/0.33 bdc-darchem 1 37 PVC SNAP VBR 512 512 94 UP
1/0.34 bdc-aerosys 1 38 PVC SNAP VBR 10000 10000 94 DOWN
1/0.24 bdc-xer 2 32 PVC SNAP VBR 1920 1920 94 UP
1/0.7 bdc-ged 3 101 PVC SNAP VBR 1920 1920 94 INAC
1/0.10 bdc-stir 4 32 PVC SNAP VBR 1920 1920 94 UP
1/0.17 fil-frz 4 33 PVC SNAP VBR 1920 1920 94 UP
1/0.2 bdc-meri 4 34 PVC SNAP VBR 256 256 94 UP
1/0.22 kwd9-cab 4 35 PVC SNAP VBR 1024 1024 94 UP
1/0.8 bdc-lion 4 36 PVC SNAP VBR 1920 1920 94 UP
1/0.4 fil-mor2 4 37 PVC SNAP VBR 4000 4000 94 UP
1/0.12 kwd9-aer1 4 38 PVC SNAP VBR 1000 1000 94 INAC
1/0.21 kwd9-par 4 39 PVC SNAP VBR 1024 1024 94 UP
1/0.9 bdc-xype 5 101 PVC SNAP VBR 1920 1920 94 UP
1/0.1 hyde1 6 101 PVC SNAP VBR 10000 10000 94 UP
1/0.3 kwd-infosys 7 101 PVC SNAP VBR 1920 1920 94 UP
1/0.23 hami-bdc 8 32 PVC SNAP VBR 512 512 94 UP
1/0.30 bdc-sitec 9 32 PVC SNAP VBR 10000 10000 94 UP
1/0.25 bdc-assys 10 32 PVC SNAP VBR 20000 20000 94 UP
1/0.18 fil-bea 11 32 PVC SNAP VBR 1920 1920 94 UP
1/0.11 bdc-goodrich 12 101 PVC SNAP VBR 1920 1920 94 UP
1/0.14 bdc-ara 15 101 PVC SNAP VBR 1920 1920 94 UP
1/0.20 fil-acc 17 101 PVC SNAP VBR 1920 1920 94 UP
1/0.27 morsons-bdc 18 101 PVC SNAP VBR 1920 1920 94 UP
kwdair9#
11-26-2012 04:11 AM
Hi,
Thanks for the information provided.
It clearly displays what I have expected: you (or somebody else) have configured quite a number of ATM PVCs with the guaranteed cell rate. The math for the "Avail bw" parameter you are questioning is very simple: this equals the full BW of the OC3/SONET interface (which is 155 000 Kbps) minus the sum of all the guaranteed bw for the PVCs configured. In your case of the VBR service category the guaranteed bw for a PVC is equal to the SCR parameter (eg. 1920 kbps for the first PVC of your list). If you add all SCR values of your ATM PVCs list you come to the value of 110 288 Kbps. Thereafter you get:
Avail bw = 155 000 - 110 288 = 44 712 (Kbps),
which is the bw available for all the other possible ATM VCs (PVCs or SVCs) without the configured guaranteed cell rate.
So as you can see your OC3 board is acting as expected (at least as for the "Avail bw" parameter calculation).
I hope my English makes sense.
Best regards,
Antonin
11-27-2012 02:05 PM
Thanks very much for that!! You've answered this perfectly.
Sent from Cisco Technical Support iPhone App
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide