‎How to identify packet loss and connectivity issue

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maclkh

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maclkh

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December 29th, 2015 04:00

How to identify packet loss and connectivity issue

Hi Support,

I'm having packet loss and connectivity issue on my current network. I have 2 core switch (dell power connect 6224 - stack) and all the access switch (power connect 6248) is connected to the core as backbone and running 19 Vlan segment, All connection are connected using 10G Fibre (SFP+). I have tested on the switches, there is no faulty on the device.

Is the network design ok?

Please find below image.

Dell Power Connect 6224 - Core Switch
Switch Fabric Capacity 136 Gb/s
Forwarding Rate 95 Mpps
Up to 8,000 MAC Addresses

Dell Power Connect 6248 - Access Switch
Switch Fabric Capacity 184 Gb/s
Forwarding Rate 131 Mpps
Up to 8,000 MAC Addresses

DJ
DELL-Josh Cr
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Posted December 29th, 2015 09:00
Hi,

There is nothing that stands out as an issue with the setup. Are you using spanning-tree? There seem to be plenty of places for loops to occur. Is the packet loss on any specific switch or randomly on all of them?
M
maclkh
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Posted December 29th, 2015 21:00
Hi,

How do i check whether is running on spanning tree? if not what is the cause? The packet loss always on core 1 (172.16.0.50). Sometimes device show offline but i still able to access using another set of IP which is (10.8.x.x)

Thanks
M
maclkh
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Posted December 30th, 2015 00:00
Hi,

I have check all the switches setting eventually is turn on. Please find below screenshot
DJ
DELL-Josh Cr
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Posted December 30th, 2015 09:00
What firmware version is that switch on? Try show spanning-tree active and see which ports are being blocked.
M
maclkh
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Posted December 31st, 2015 00:00
Hi,

All switches firmware is 3.3.3.3. Below is the STP Port Table

Port 25 1/xg3, STP=enable, STP Root Guard=disable, State=Discarding, Role=Alternate

What does it mean state is discarding? Being block?
DJ
DELL-Josh Cr
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Posted December 31st, 2015 07:00
Discarding is when spanning-tree is blocking because there is a loop. Which port is 172.16.0.50 connected to?
M
maclkh
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Posted January 4th, 2016 00:00
Hi,

There is a switch (172.16.0.55) connect to 172.16.0.50 port 25 1/xg3

Thanks
DJ
DELL-Josh Cr
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Posted January 4th, 2016 07:00
It looks like it is in forwarding mode like it should be. Does the issue occur all of the time or just randomly?
M
maclkh
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Posted January 6th, 2016 00:00
Hi,

We are having this issue when many users are connecting to network and we have use spiceworks for monitoring, it always show "The Network is consistently overloaded"
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DELL-Josh Cr
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Posted January 6th, 2016 06:00
If you do show process cpu and show memory cpu when the issue is occurring what does it show? It is possible that your traffic is overloading what the switch is capable of transmitting.