O'Reilly logo
  • muha med thinks this is interesting:

Now we have a live link between these routers, which appear to be directly connected. However, the Ethernet network on Router D, which was known through the serial link, is still known through the serial link, and not the tunnel. If the tunnel is theoretically directly connected to both routers, why isn’t the tunnel the preferred path?


Cover of Network Warrior, 2nd Edition


Why a Ethernet network on a connected souter is learned through the serial interface but not GRE tunnel