Last Modified: Sep 13, 2023
Known Affected Versions:
11.5.1, 11.5.2, 11.5.3, 11.5.4, 11.5.5, 11.5.6, 11.5.7, 11.5.8, 11.5.9, 11.5.10
Opened: Feb 13, 2015 Severity: 3-Major
Statically configured port speeds and duplex disables port autonegotiation
Link may not establish. As a result, the mgmt interface might not be connected. The link may establish but can be in a mismatched state where neither side agrees on speed and/or duplex. Connectivity can occur over the console port to restore interface settings.
Connect the mgmt interface to a remote switch port that is set to auto negotiate and set the mgmt interface media to something other than 'auto'. Alternatively, the condition may be encountered when the mgmt interface is set to autonegotiate speed and duplex but the remote switch port may be set to static values. In both cases, a high amount of collisions and dropped packets can be oversed on the mgmt interface.
Make sure the mgmt interface media setting is 'auto' when connecting to autonegotiating switch ports. Make sure the mgmt interface's static configuration aligns with the connected switch ports when using static switch port configurations.