CEF (Cisco Express Forwarding)

[lagapidis (Lazarus Agapidis)]

Hello Shivam

Take a look at this post:

How does a switch learn MAC Addresses

Hello Rakshit Let’s say you have a setup like this: [image] Host A wants to ping Host B. The following will occur: Host A will encapsulate an IP packet with a source IP of 10.0.0.100 and a destination IP of 20.0.0.100. The host sees that the destination IP is not in the same subnet as the source IP. When this is encapsulated into an Ethernet frame, the MAC of the next hop must be determined. Since the destination is not in the same subnet, the host will need the MAC of the default gatew…

I hope this has been helpful!

Laz