Configuring PPP on a Serial Line (Optional Commands): Link Quality

Router(config-if)#ppp quality x

Ensures the link must have a quality of x percent; otherwise, the link will shut down

Note:

In PPP, the Link Control Protocol allows for an optional link quality determination phase. In this phase, the link is tested to determine whether the link quality is sufficient to bring up any Layer 3 protocols. If you use the command ppp quality x, where x is equal to a certain percent, you must meet that percentage of quality on the link. If the link does not meet that percentage level, the link cannot be created and will shut down.