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UDP traffic limitation in DOCSIS

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gyu72
UDP traffic limitation in DOCSIS

Hi!

We using some DOCSIS 2.0 CMTS, Arris C3 and Terayon. The problem is, we are not limiting the UDP traffic behind the cable modem.
Example:
If we setting the max downstream speed in the cable modem configuration file 4048000 Bit/Sec when the TCP traffic is about ok. But if we try the iperf with UDP option (UDP server - UDP clients) the UDP traffic is 30MBit/Sec!

Please help me anybody, how can I limit the UDP traffic!

THX...

Sorry my poor english.

gyu

wittmann
UDP traffic limitation in DOCSIS

Hello gyu72,

please posting a example from your cable modem configfile.

gyu72
Example config file

wittmann wrote:Hello gyu72,

please posting a example from your cable modem configfile.

Hi!

Here the config file:

NetworkAccess = 1
MaxCpeAllowed = 4
UpstreamServiceFlow =
SfReference = 1
SfQosSetType = 7
SfMaxTrafficRate = 512000
SfMaxTrafficBurst = 1600
SfMinReservedRate = 0
SfSchedulingType = 2
UpstreamServiceFlow =
SfReference = 2
SfQosSetType = 7
SfMaxTrafficRate = 512000
SfMaxTrafficBurst = 1600
SfSchedulingType = 2
DownstreamServiceFlow =
SfReference = 101
SfQosSetType = 7
SfMaxTrafficRate = 4048000
SfMaxTrafficBurst = 1600
DownstreamServiceFlow =
SfReference = 102
SfQosSetType = 7
SfMaxTrafficRate = 4048000
SfMaxTrafficBurst = 1600
UpstreamPacketClassification =
PcServiceFlowReference = 2
PcReference = 2
PcActivationState = 1
PcRulePriority = 1
PcIpClassification =
PcIpDestMask = 0.0.0.0
PcIpDestAddress = 0.0.0.0
PcIpSourceMask = 0.0.0.0
PcIpSourceAddress = 0.0.0.0
PcIpProtocol = 17
PcIpDestPortEnd = 2727
PcIpDestPortStart = 2727
UpstreamPacketClassification =
PcServiceFlowReference = 2
PcReference = 3
PcActivationState = 0
PcEthernetLLC =
PcEtherDsapMactype = hexstr: 03.0F.16
DownstreamPacketClassification =
PcServiceFlowReference = 102
PcReference = 102
PcRulePriority = 1
PcActivationState = 1
PcIpClassification =
PcIpDestMask = 0.0.0.0
PcIpDestAddress = 0.0.0.0
PcIpSourceMask = 0.0.0.0
PcIpSourceAddress = 0.0.0.0
PcIpProtocol = 17
PcIpDestPortEnd = 2427
PcIpDestPortStart = 2427
MaxClassifiers = 20
PrivacyEnable = 0

gyula

wittmann
UDP traffic limitation in DOCSIS

hmmm..at the first look i will say you need the PacketClassifier for MGCP/NCS-Messages or DSX-Messages for PacketCable, right?

gyu72
UDP traffic limitation in DOCSIS

Hi!

Sorry I dont know exactly what difference betwen the MGCP/NCS-Messages or DSX-Messages for PacketCable. Get config file from the local Thomson vendor.

gyula

So sorry, but my english is bad.

wittmann
UDP traffic limitation in DOCSIS

DSX stands for DSA, DSC and DSD, Dynamic Service Adition, Change and Delete. You can find it on DOCSIS 1.1 Spec. (CM-SP-RFIv1.1, Chapter 9.4) from CableLabs.

MGCP/NCS are the Registration and Signaling-Protocoll for VoIP-Solution by PacketCable-Devices. At PacketCable 2.0, upcomming Q1-07 (hopefully :roll: ) are SIP available on PacketCable, too.

Now a new Question:

What need you exactly, what should this configfile do?

gyu72
UDP traffic limitation in DOCSIS

Hi!

Thanks answer.

The my basic question: I like to limiting the UDP traffic behind the cablemodem!

gyula

Anonymous (not verified)
UDP traffic limitation in DOCSIS

Hi, try this
PcIpProtocol = 17
change to
PcIpProtocol = 256

256 means ANY protocol, not only protocol 17.
But, there may be a problem, because DQOS specification clearly dictate use ipprotocol = 17 in case of VOIP service flow.
Either try to create 2 service flow, default (4 mbit limitation and IPProto=256) and VoIP (IPProto=17 and other options)

Anonymous (not verified)
UDP traffic limitation in DOCSIS

Hi Gyu,

the DS speed limit is enforced at the CMTS...please check if you find a line 'cable downstream rate-limit' in your C3 config. If this line is not present, the CMTS ignores the SfMaxTrafficRate value in the config file.

Also, do you really get 30 Mbps downstream throughput without any packet loss?

Regards