realfoh
asked on
Cisco Catalyst 3850 with poor performance and packet loss
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?
- 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?
Craig Beck
What code are you running on the switch?
Can you post any configs?
ASKER
Firmware update resolved the problem, bug from Cisco
ASKER
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.
Accepted answer: 0 points for realfoh's comment #a40775511
for the following reason:
Difficult problem, poor info, solution located through support.
What code are you running on the switch?I knew it! What version were you running?
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ASKER
Sure. Sorry about that :)