![]() If the timers are out of sync, the sequence numbers start to get out of order. Since HDLC keepalives are ECHOREQ type keepalives, the keepalive frequency is important and it is recommended that they match up exactly on both sides. Note: When the difference in the values in the myseq and mineseen fields exceeds three on Router 2, the line goes down and the interface is reset. The "yourseen" which is our acknowledgement to the other side.The "mineseen" which is actually an acknowledgement from the other side (incremented) which says they expect this number from us.The "myseq" which is our own incrementing number.HDLC keepalives contain three pieces in order to determine it works: For HDLC encapsulation, three ignored keepalives causes the interface to be brought down.Įnable the debug serial interface command for an HDLC connection in order to allow the user to see keepalives that are generated and sent: Sample Output:ġ7:21:09.685: Serial0/0: HDLC myseq 0, mineseen 0*, yourseen 1, line up With the use of sequence numbers to track each keepalive, each device is able to confirm if it's HDLC peer received the keepalive it sent. ![]() Serial keepalives are sent back and forth between two routers and the keepalives are acknowledged. Note: For both PPP and HDLC encapsulation types, a keepalive of zero disables keepalives and is reported in the show running-config command output as keepalive disable.Īnother well-known keepalive mechanism is serial keepalives for HDLC. It does not apply to serial interfaces that use Frame Relay encapsulation. Note: The keepalive command applies to serial interfaces that use High-Level Data Link Contol (HDLC) or PPP encapsulation.
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