Overview:
A host route is used to route traffic to a specific host. The subnet mask in the route will always be all 1's. That means the subnet mask for a host route will be /32 for IPv4 and /128 for IPv6.
Study Notes:
- A host route is configured to route packets to a specific host
- The subnet mask will be all 1's
- The IPv4 subnet mask of a host route will always be /32
- The IPv6 subnet mask of a host route will always be /128
- Host routes are automatically added to the routing table for all IPv4 and IPv6 addresses that are configured on the router
- The purpose of a host route is to create a corresponding CEF entry as a receive entry so that the packets destined to this IP address can be processed by the router itself
- Loopback interfaces are commonly created with /32 subnet masks and will therefore appear as a host route in the routing table
- Host routes are the most specific route possible and therefore take precedence over all other routes (based on the network mask)
- Configure an IPv4 host route by typing:
config t
ip route <host-to-route-to> 255.255.255.255 <exit-interface-on-this-router>
--OR--
ip route <network-to-route-to> <subnet-mask> <next-hops-ipv4-address>
- Configure an IPv6 network route by typing:
config t
ipv6 route <network-to-route-to>/<subnet-mask> <exit-interface-on-this-router>
--OR--
ipv6 route <network-to-route-to>/<subnet-mask> <next-hop-ipv6-address>
Labs:
PacketTracer Lab: CCNA-3.8.c-Host-route.pkt
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