The myseq counter increases by one each time the router sends a keepalive packet to remote router. The value of the mineseen counter reflects the last myseq sequence number the remote router has acknowledged receiving from the router. The remote router stores this value in its yourseen counter and sends that value in a keepalive packet to the router. The yourseen counter reflects the value of the myseq sequence number the router has received ina a keepalive packet from the remote router. Value changes to line down if the values of the myseq and myseen fields in a keepalive packet differ by more than three.
Value returns to line up when the interface is reset.
If the line is in loopback mode. This message is displayed if the router attempts to send a packet containing an unknown packet type. This message is displayed if an unknown packet type is received. The hardware is then reset to hopefully correct the problem. Received bridge packet sent to nnnnnnnnn This message is displayed if a bridge packet is received over a serial interface configured for HDLC, and bridging is not configured on that interface.