40G/100G Ethernet port does not auto negotiate with Nexus 9k cluster switch
Applies to
- ONTAP 9
- 40/100G Ethernet port
- Cisco N9K-C9336C-FX2 switch (Nexus 9336C-FX2)
Issue
- When auto-negotiate is enabled, the Ethernet port will intermittently not link up with:
N9K-C9336C-FX2 data switch
Port speed must be hard set to come up
- This can also occur after switch firmware upgrade
- ONTAP will report the card link down in EMS log:
[?] Thu Sep 14 22:16:04 +0000 [cluster-01: intr: netif.linkDown:debug]: Ethernet e3a: Link down, check cable.
[?] Thu Sep 14 22:16:04 +0000 [cluster-01: intr: net.ifgrp.lacp.link.inactive:debug]: ifgrp a0a, port e3a has transitioned to an inactive state. The interface group is in a degraded state.
[?] Thu Sep 14 22:16:04 +0000 [cluster-01: vifmgr: vifmgr.portdown:debug]: A link down event was received on node cluster-01, port e3a.
- From ASUP ->
CLUSTER-SWITCH-INTERFACE.XML, the down port is reporting an incorrect interface speed (Mbps).
| Switch Name | Interface Name | Interface Index | Interface Type | MTU | Duplex Settings | Interface Speed(Mbps) | Adminstrative Status | Operational Status | Is ISL |
| csopslabs(FLM253004HB) | Ethernet1/7 | 436210688 | ethernetCsmacd | 9216 | unknown | 100000 | up | down | no |
| csopslabs(FLM253004HB) | Ethernet1/8 | 436211200 | ethernetCsmacd | 9216 | full-duplex | 40000 | up | up | no |
