Compatibility mode for v2 zl and zl modules

In the following context, v2 zl modules are the second version of the current zl modules. Both v2 zl and zl modules are supported in the 5400zl series chassis switches.

Compatibility Mode allows the inter-operation of v2 zl modules with zl modules in a chassis switch. When in Compatibility Mode, the switch accepts either v2 zl or zl modules. The default is Compatibility Mode enabled. If Compatibility Mode is disabled by executing the no allow-v1-modules command, the switch will only power up v2 zl modules.