Just wondering how we are able to get serial ports on a Cisco router to communicate via TCP/IP when there appears to be no MAC address on the serial port of a Cisco Router?
FastEthernet0/0 is up, line protocol is up
Hardware is AmdFE, address is 000d.2999.2320 (bia 000d.2999.2320)
Serial0 is up, line protocol is up
Hardware is HD64570
Description: LINK TO MSC2
MTU 1500 bytes, BW 128000 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation X25, loopback not set
Where does the Serial MAC address come from?
Anyone can correct me if i am wrong.
There is no MAC used in the WAN network.
As MAC works on layer 2 the same way you need to configure the encapsualtion which would work on layer 2.
It can be HDLC or PPP thats the reason how the latyer 2 communcation takes place. If you do not configure the Encapsulation this would not work.
The best example would be the technology Frame-relay its a layer 2 but works on wan without any MAC address.