11-19-2022 12:20 PM
Hi guys
very basic question, how does the switch check the layer 1 status of the switch is up? I.e line protocol
does it listen for data or sense a voltage of some sort?
xheers
11-19-2022 02:22 PM
yes kind of electric signal on layer 1.
if you like to go deep dive you need to read IEEE / RFC
below wiki help you ;
11-20-2022 04:41 AM
all L2 protocol have such as hello message, both end exchange this hello message with some detail about L2 protocol in it end,
if the L2 protocol is mismatch then the L2 is down as show in log below
I use two router and use one end using PPP and other use HDLC and since this two protocol is mismatch then the L2 is down.
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