maclkh
1 Nickel

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

0 Kudos
12 Replies
Highlighted
Moderator
Moderator

RE: How to identify packet loss and connectivity issue

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?

Thanks,
Josh Craig
Dell EMC Enterprise Support Services
Get support on Twitter @DellCaresPRO
0 Kudos
maclkh
1 Nickel

RE: How to identify packet loss and connectivity issue

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

0 Kudos
maclkh
1 Nickel

RE: How to identify packet loss and connectivity issue

Hi,

I have check all the switches setting eventually is turn on. Please find below screenshot

0 Kudos
Moderator
Moderator

RE: How to identify packet loss and connectivity issue

What firmware version is that switch on? Try show spanning-tree active and see which ports are being blocked.

Thanks,
Josh Craig
Dell EMC Enterprise Support Services
Get support on Twitter @DellCaresPRO
0 Kudos
maclkh
1 Nickel

RE: How to identify packet loss and connectivity issue

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?

0 Kudos
Moderator
Moderator

RE: How to identify packet loss and connectivity issue

Discarding is when spanning-tree is blocking because there is a loop. Which port is 172.16.0.50 connected to?

Thanks,
Josh Craig
Dell EMC Enterprise Support Services
Get support on Twitter @DellCaresPRO
0 Kudos
maclkh
1 Nickel

RE: How to identify packet loss and connectivity issue

Hi,

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

Thanks

0 Kudos
Moderator
Moderator

RE: How to identify packet loss and connectivity issue

It looks like it is in forwarding mode like it should be. Does the issue occur all of the time or just randomly?

Thanks,
Josh Craig
Dell EMC Enterprise Support Services
Get support on Twitter @DellCaresPRO
0 Kudos
maclkh
1 Nickel

RE: How to identify packet loss and connectivity issue

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"

0 Kudos