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Sporadic connection drops (s4810)
We have a pair of s4810 (OS 9.14) switches in a stack. (Core switches in an isolated layer 2 LAN)
A NAS server with an Intel XL710-QDA2 NIC, is connected via 802.3ad, via 2 x 40GbE SQFP's.
For many months now, the NAS connection drops for 1 second, every 3-90 hours.
(Only troubleshooting it now since the issue was underreported and I thought it was just 1 client experiencing the issue… which was incorrect.)
The switch's logs track it. Typical example:
Sep 14 14:31:24 %STKUNIT0-M:CP %LACP-5-PORT-GROUPED: PortChannel-056-Grouped: Interface Fo 0/56 joined port-channel 56.
Sep 14 14:31:24 %STKUNIT0-M:CP %IFMGR-5-OSTATE_UP: Changed interface state to up: Po 56
Sep 14 14:31:24 %STKUNIT0-M:CP %LACP-5-PORT-GROUPED: PortChannel-056-Grouped: Interface Fo 1/56 joined port-channel 56.
Sep 14 14:31:23 %STKUNIT0-M:CP %IFMGR-5-OSTATE_DN: Changed interface state to down: Po 56
Sep 14 14:31:23 %STKUNIT0-M:CP %LACP-5-PORT-UNGROUPED: PortChannel-056-Ungrouped: Interface Fo 1/56 exited port-channel 56.
Sep 14 14:31:23 %STKUNIT0-M:CP %LACP-5-PORT-UNGROUPED: PortChannel-056-Ungrouped: Interface Fo 0/56 exited port-channel 56.
According to the NAS' tech support, the NAS logs don't show any link drops, but show dropped packets. Conversely, the switch sees link drops (above) but no packet issues: 0 runts, 0 giants, 0 throttles, 0 CRC, 0 overrun, 0 discarded on both ports as well as the port-channel.
- I updated the NAS software, problem still persists.
- I don't think it's the cables/connections since both LACP connections always drop together (and return together).
- Not seeing this issues or errors with other ports/devices. Though I do see “Configuration mismatch with neighbor” on other ports. Is that just normal when a port goes live in a stack?
Any thoughts? Does it "smell" like a hardware problem? Or similar to known issues you've seen in certain driver versions, configurations, etc.?
Config:
interface fortyGigE 0/56
description NAS03
no ip address
!
port-channel-protocol LACP
port-channel 56 mode active
no shutdown
!
interface fortyGigE 1/56
description NAS03
no ip address
!
port-channel-protocol LACP
port-channel 56 mode active
no shutdown
!
interface Port-channel 56
description NAS03
no ip address
switchport
no shutdown
DELL-Joey C
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19-09-2023 08:34 AM
Hi,
By the looks at the configuration for port channel that you provided are correct. Can you check the interface status of the 40Gb module and also the MTU size? There are a few to check on the switch configuration, I may suggest contacting the switch support to confirm if the configuration are correct for your NAS environment, since you have already checked the NAS server.