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Cisco Catalyst 3850 with poor performance and packet loss

Posted on 2014-02-21
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Last Modified: 2015-05-13
Following setup:
- Cisco Catalyst 3850 (IP Base) running as core switch
  - Connection to WAN on SFP (500Mbps)
  - Connection to LAN on Gbit
  - SVI VLAN 50 providing internet to LAN with 2 VLANs, x.x.214.x/24 and x.x.217.x/24.
  - Routing performed on this switch

After installation, one of the subnets in LAN were connected (.214) with normal performance and no problems whatsoever.
After a few weeks, the second subnet in LAN is added to the network using a fully transparent QinQ to a remote network. Only L2 Cisco equipment on the remote side of the QinQ.

After adding the second subnet we started getting strange issues:
- Packet loss against gateway (3850) from all parts of the network
- Only 12Mbps from WAN when connected to a VLAN 50 access port on the 3850.
- After rebooting the 3850, suddenly > 400Mbps on the same port, no configuration changes.

The packet loss and low performance has been riding the whole network ever since adding the secondary network, but since this is a production network we have not been able to disconnect the network with the .217 subnet for a longer period of time (yet shorter disconnects of 10+ minutes) have not resolved the problems.

Any ideas?
- Related to the .217 subnet?
- Faulty 3850?
- Configuration issues?
- Suggestions for debug and resolving the problem?
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Question by:realfoh
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by:Craig Beck
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What code are you running on the switch?
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Expert Comment

by:Soulja
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Can you post any configs?
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by:realfoh
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Firmware update resolved the problem, bug from Cisco
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Author Comment

by:realfoh
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I've requested that this question be closed as follows:

Accepted answer: 0 points for realfoh's comment #a40775511

for the following reason:

Difficult problem, poor info, solution located through support.
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Expert Comment

by:Craig Beck
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What code are you running on the switch?
I knew it!  What version were you running?
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Craig Beck earned 500 total points
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The first question I asked on Feb 21st was...

What code are you running on the switch?
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Author Closing Comment

by:realfoh
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Sure. Sorry about that :)
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