dynamically allow the switch to learn mac addresses of pcs on vlan

! Below, Switch4's MAC address table shows PC1's MAC off its FA 0/6 switch4# show mac-address-table dynamic ! Above, Switch1 learned the PC's MAC address, associated with FA 0/13, ! because the frames sent by the PC came into Switch1 over its FA 0/13. Total Mac Addresses for this criterion: 5 ! Not shown: PC1 ping 10.1.1.23 (R3) PC1's MAC in its MAC address table

Total Mac Addresses for this criterion: 4 Each switch has a range of reserved MAC addresses, with the first MAC ! being used by the switch IP address, and the rest being assigned in sequence to ! the switch interfaces – note 0xcd (last byte of 2 nd address in the table above) ! is for Switch4's FA 0/13 interface, and is 13 (decimal) larger than Switch4's ! base MAC address. ! Below Switch1 now knows the MAC address associated with Switch4's management IP ! address. Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms Sending 5, 100-byte ICMP Echos to 10.1.1.4, timeout is 2 seconds:

! Below, Switch1 pings Switch4's management IP address. ! Above, Switch1's MAC address table lists three dynamically learned addresses, Total Mac Addresses for this criterion: 3 Sample Network with MAC Addresses Shown Example 1-2 Command Output Showing MAC Address Table Learning Switch1# show mac-address-table dynamic Figure 1-6 lists the devices in the network associated with Example 1-2, along with their MAC addresses. You can see the learning process in Example 1-2, along with several other details of switch operation.

Switches learn MAC addresses, and the port to associate with them, by reading the source MAC address of received frames. Forwards frame out the single interface associated with the destination addressįloods frame out all interfaces, except the interface on which the frame was receivedįloods frame identically to unknown unicastsįloods frame identically to unknown unicasts, unless multicast optimizations are configuredįor unicast forwarding to work most efficiently, switches need to know about all the unicast MAC addresses and out which interface the switch should forward frames sent to each MAC address.

Dynamically allow the switch to learn mac addresses of pcs on vlan