Problems Commonly Diagnosed with Stack Formation
The most common reason for an unsuccessful stack build is a hardware configuration
mismatch, a software configuration mismatch, or a combination of both.
The following common problems may be encountered when building stacks:
- Ports on the same trunk connect to different units.
- Ports on the same trunk connect to different trunks on the same unit.
- Sub-ports of the 4 x 10-Gbps module are down.
- One end of a 10-Gbps port is up, but the other end is down.
- Communication problems exist between units in the stack.
A common connection error is that the two cables of a trunk go to different units or to different trunks on the same unit. A stack may still form in these cases, but the incorrect connection may cause an internal forwarding loop, or the unit may have forwarding problems.