I have 2 Cisco 2811 routers which are connected back to back through 2 modems. In order to understand the time taken for the interface to come up, cable connected to Serial interface has been removed and plugged in again.
I have kept continuous ping from the LAN side of one router to the LAN side of remote router.
Observations of this testing are as follows:
If I plugin the cable to serial interface within 30 seconds of removal of cable, ping gets reply within 3 seconds of delay.
If I plugin the calbe to serial interface after spending 1 minute or more, the ping reply gets delayed by 35 to 40 seconds.
Please help me to understand the cause.