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

Notice that although Router A indicates that the interface is up, because Router D does not yet have a tunnel interface, nothing can be sent across the link. Be careful of this, as you may get confused under pressure. The tunnel network is even active in Router A’s routing table (it will not be found on Router D at this time):


Cover of Network Warrior, 2nd Edition


Loopholes that may trick you in GRE