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Huawei 6851 sFlow Questio...

Huawei 6851 sFlow Question

Created: Feb 13, 2022 19:01:52Latest reply: Feb 15, 2022 09:29:25 225 7 0 0 0
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Hello,

I have a Huawei 6851-48S6Q and i want to enable sFlow on my uplinks and set 1:2048 as sampling rate. i have two questions:

  1. Is there any affect on the switch CPU?

  2. Is there any dedicated ASIC for sFlow in this model like juniper ex4200 ?

Thank you.

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fuzi_yao
Admin Created Feb 14, 2022 00:30:37

Hi, friend!

Check the device version. If the device version is v200, the device supports sflow. If the device version is V300, the device does not support the sflow protocol and uses the NetStream protocol for traffic sampling. With respect to the question that you raised

1. The enhanced mode can be used to configure sFlow sampling. When the enhanced mode is used for sFlow sampling, it is recommended that the sFlow sampling ratio be set to 1/2 k. In this case, 1:2048 is not affected.

2. The ASIC chip you mentioned is used by Juniper. In my opinion, the enhanced mode function of Huawei switches is the same as that of Juniper.

For more information, you can refer to the link below.

Enabling a Switch to Perform sFlow Sampling in Enhanced Mode

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fuzi_yao
fuzi_yao Admin Created Feb 14, 2022 00:30:37

Hi, friend!

Check the device version. If the device version is v200, the device supports sflow. If the device version is V300, the device does not support the sflow protocol and uses the NetStream protocol for traffic sampling. With respect to the question that you raised

1. The enhanced mode can be used to configure sFlow sampling. When the enhanced mode is used for sFlow sampling, it is recommended that the sFlow sampling ratio be set to 1/2 k. In this case, 1:2048 is not affected.

2. The ASIC chip you mentioned is used by Juniper. In my opinion, the enhanced mode function of Huawei switches is the same as that of Juniper.

For more information, you can refer to the link below.

Enabling a Switch to Perform sFlow Sampling in Enhanced Mode

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user_4442131
user_4442131 Created Feb 14, 2022 07:00:11

Hi,
my switch model is 6851-48s6q and it seems it does not support enhanced mode,
the command just support netstream and here is the output:
assign forward enp netstream enable slot 1
Error: The board does not support this capability.

so this switch can just handle sflow packets by CPU ? if I use netstream it will use CPU again on this model?
Thanks
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fuzi_yao
fuzi_yao Created Feb 14, 2022 07:04:38 (0) (0)
If you can tell me the version of your device, run the display version command.  
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4#
user_4442131
user_4442131 Created Feb 14, 2022 09:30:47

here is the version informations:
display version
Huawei Versatile Routing Platform Software
VRP (R) software, Version 8.180 (CE6851HI V200R005C10SPC800)
Copyright (C) 2012-2018 Huawei Technologies Co., Ltd.
HUAWEI CE6851-48S6Q-HI uptime is 5 days, 1 hour, 23 minutes

CE6851-48S6Q-HI(Master) 1 : uptime is 5 days, 1 hour, 22 minutes
StartupTime 2022/02/09 11:37:58+03:30
Memory Size : 2048 M bytes
Flash Size : 1024 M bytes
CE6851-48S6Q-HI version information
1. PCB Version : CEM48S6QP04 VER B
2. MAB Version : 1
3. Board Type : CE6851-48S6Q-HI
4. CPLD1 Version : 103
5. CPLD2 Version : 103
6. BIOS Version : 433
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fuzi_yao
fuzi_yao Created Feb 15, 2022 00:54:50 (0) (0)
I looked up information about this version, which supports the NetStream protocol. It does not support sflow, so it cannot be configured with enhanced mode.  
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user_4442131
user_4442131 Created Feb 15, 2022 09:29:25

@fuzi_yao
Hi,
So if i use netstream to collect data is it cause high cpu usages during ddos attacks?
Because it seems this model does not support netstream enhanced version so i think it will consume CPU to collect data, does not it?
because i am not so much familiar with netstream.
THank you.
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fuzi_yao
fuzi_yao Created Feb 16, 2022 00:57:52 (0) (0)
The netstream protocol is used to replace the sflow protocol. As to whether the CPU usage is high during ddos, I think it will.
In addition, NetStream does not support the enhanced version, which is used by sflow. As to whether it consumes cpu to collect data, I think it does. However, this problem is not explained in the document, so we can only analyze it empirically.  
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