Hi every body!
ISl header has source mac and destination mac address feilds among others.
sw1 f0/1-----------------f0/2 sw2
Sw1 and sw2 are connected by trunk .
What would be src mac address and destination mac address in ISL header when sw1 sends a frame to sw2? Is it the mac address associated with f0/1 on sw1 and mac address associated with f0/2 on sw2 ? or it is the base mac address switches uses ?
Thanks a lot andhave a nice day!
as Jon has noted the ISL frame uses MAC addresses in the ISL header but in a way different from the ethernet frame carried inside it.
It could be said that ISL designers had thought also of some forms of multipoint connections or about the presence of hubs or non Cisco switches in the middle.
the following document is very useful because it provides detailed information of all L2 protocols
Hope to help
The source address should be the mac-address of the fa0/1 interface.
The destination address however is not the mac-address of fa0/2 on sw2. The destination address in the ISL header is a multicast destination address, either
0x01-00-0C-00-00 or 0x03-00-0c-00-00