[AusNOG] Egress shaping on Telstra EA Service

[Greg Lipschitz]

Hi Andrew,

What class of service with Telstra?

Have a look at the TSIS document https://portal.telstrawholesale.com.au/TwpWebPortal/DocumentViewerServlet?docType=PUBLIC_CONTENT&dDocName=ETH_ACC_TWA245_246_TSIS

On page 52 – See table 7.4 and p53 7.4.1
If you have a Ethernet Access Standard CoS Service, you will need to look at the EBS as to what they are going to discard at.
You will then need to look at applying a queue so that you don’t get his with this issue.

Hope that helps ☺

Cheers,
Greg




Greg Lipschitz | Founder & CEO | The Summit Group
Greg at thesummitgroup.com.au
thesummitgroup.com.au
1300 049 749
Level 1, 39 Railway Road, Blackburn VIC 3130
The Summit Group
From: AusNOG [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Andrew Yager
Sent: Friday, 16 December 2016 1:23 PM
To: ausnog at lists.ausnog.net
Subject: [AusNOG] Egress shaping on Telstra EA Service

Hi,

I'm working through troubleshooting a 200M EA service. Shapers are done on Juniper MX (head end) and Juniper SRX300 (customer end).

Ingress we are receiving full bandwidth to shaping value (195Mbps)
Egress we are only receiving 30Mbps for TCP traffic only.

If I clamp the shaper down to 10Mbps, I see that the speed drops to a flat 9.8Mbps.

If I do an iperf using UDP, I'm seeing the full 195Mbps from client machine out.

Does anyone have any ideas about what this could be? We've got a few other SRX300s in the field using the same config; and so it doesn't look like that's the problem - and also given that clamping the shaping to 10Mbps evens the results it seems like the SRX won't be what is at fault.

Shaper config on customer side:

# show class-of-service
interfaces {
    ge-0/0/0 { <!-- this is facing customer machine for testing
        unit 0 {
            scheduler-map policer;
        }
    }
    ge-0/0/5 { <!-- this is facing Telstra NTU
        unit 0 {
            scheduler-map policer;
        }
    }
}
scheduler-maps {
    policer {
        forwarding-class best-effort scheduler rate-limit-195m;
    }
}
schedulers {
    rate-limit-195m {
        shaping-rate 195m;
    }
}

# run show class-of-service scheduler-map policer
Scheduler map: policer, Index: 55355

  Scheduler: rate-limit-195m, Forwarding class: best-effort, Index: 19467
    Transmit rate: unspecified, Rate Limit: none, Buffer size: remainder, Buffer Limit: none, Priority: low
    Excess Priority: unspecified
    Shaping rate: 195000000 bps
    Drop profiles:
      Loss priority   Protocol    Index    Name
      Low             any             1    <default-drop-profile>
      Medium low      any             1    <default-drop-profile>
      Medium high     any             1    <default-drop-profile>
      High            any             1    <default-drop-profile>


UDP Iperf from client outbound that shows it's not the link capacity…


[ ID] Interval      Transfer    Bandwidth        Jitter  Lost/Total Datagrams
[  3]  0.0-27.7 sec  636 MBytes  192 Mbits/sec  0.029 ms 24291/478152 (5.1%)
[  3]  0.0-27.7 sec  1 datagrams received out-of-order
[  4] local xx port 5001 connected with xx port 58752
[  4]  0.0-10.3 sec  229 MBytes  187 Mbits/sec  16.141 ms 8958/172410 (5.2%)
[  4]  0.0-10.3 sec  1 datagrams received out-of-order
[  3] local xx port 5001 connected with xx port 60477
[  3]  0.0-10.0 sec  228 MBytes  191 Mbits/sec  0.039 ms 9595/172190 (5.6%)
[  3]  0.0-10.0 sec  1 datagrams received out-of-order
[  4] local xx port 5001 connected with xx port 50602
[  4]  0.0-30.0 sec  683 MBytes  191 Mbits/sec  0.023 ms 29513/516460 (5.7%)

Any advice/input would be appreciated. I'm also curious if there is any chance this could still be Telstra?

Thanks,
Andrew
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