This topic provides information about the keep-alive exchange and
permanent virtual circuit (PVC) status change.
- Keep-alive exchange
- Use the keep-alive exchange to maintain contact between the terminal
equipment (TE) and the frame handler (FH). It consists of an exchange of sequence
messages.
At intervals specified by the POLLITV parameter, the TE sends
status inquiry messages to the FH. The FH responds with a status message that
includes the correct sequence number (both status inquiry and status messages
include sequence numbers).
- PVC status change
- After the number of status inquiry messages specified
by the FULLINQITV parameter have been completed, the TE requests a full status
from the FH. The FH responds with a status message that includes
a list of the PVCs assigned to the physical connection and the status of each
PVC.
You can use the Display Network Interface Description (DSPNWID) command
to show the PVC status reported by the network.