Table 3: show switch stack-ports summary Command Output Managing Switch Stacks show switch stack-ports summary Command Output: Example Field Description Switch#/Port# Member number and its stack port number. Stack Port Status Status of the stack port. • Down—A cable is detected, but either no connected neighbor is up, or the stack port is disabled. • OK—A cable is detected, and the connected neighbor is up. Neighbor Switch number of the active member at the other end of the stack cable. Cable Length Valid lengths are 50 cm, 1 m, or 3 m. If the switch cannot detect the cable length, the value is no cable. The cable might not be connected, or the link might be unreliable.
When there is no cable connected to the stack port, the value displayed is no cable along with the cable length value. Link OK Whether the stack cable is connected and functional. There may or may not be a neighbor connected on the other end. The link partner is a stack port on a neighbor switch. • No—There is no stack cable connected to this port or the stack cable is not functional. • Yes—There is a functional stack cable connected to this port. Link Active Whether a neighbor is connected on the other end of the stack cable. • No—No neighbor is detected on the other end. The port cannot send traffic over this link. • Yes—A neighbor is detected on the other end.
The port can send traffic over this link. Sync OK Whether the link partner sends valid protocol messages to the stack port. • No—The link partner does not send valid protocol messages to the stack port. • Yes—The link partner sends valid protocol messages to the port. # Changes to LinkOK The relative stability of the link. If a large number of changes occur in a short period of time, link flapping can occur. In Loopback Whether a stack cable is attached to a stack port on the member. • No—At least one stack port on the member has an attached stack cable. • Yes—None of the stack ports on the member has an attached stack cable. Managing Switch Stacks 13