Janet to us
- Jan 25, 2006
- Reaction score
- Work.... Where else?
Lol, we're not talking Cisco kit here though are we. Whilst the various line cards that can be added will indeed have MAC addresses, as will the devices connected which you can see via showing the MAC address table.Could I suggest you consult your notes? Cisco routers have a base MAC, a unique MAC for each physical interface and another for each virtual interface. There may be additional MAC addresses depending on installed hardware (i.e. switch module) etc. In 'enable' mode type 'show int(erfaces)' to view them.
P.S. I was working with Cisco kit when it was a start-up company
In the past implicit tagging required each port to have a MAC address. With 802.1Q, that is no longer necessary.
Transparent bridging does not alter the frame. Layer 2 switches do not need the base Ethernet MAC address of the device nor its switchport MAC addresses to operate. The source and destination MAC addresses of the incoming frame are examined, the first one being saved in the MAC address table along with the receiving port, while the destination MAC address being looked up in the MAC address table to see if there is an associated port. If there is the frame is forwarded out that port only, otherwise it gets broadcast out all ports, except the source port (split horizon rule).
During the whole process the frame remains completely unchanged (unless forwarded towards a VLAN trunk - then the frame gets tagged with VLAN ID).
Let's call it a draw