8.1.3 Routing information

The following table describes the routing information handled by the Switch (the address types subject to routing).

Table 8-1: Route information
Routing information		Description
Standard routes	Default route	A route that matches every network destination (destination address: 0.0.0.0, network mask: 0.0.0.0).
	Natural mask route	A network mask route derived from the address class (network mask: 8 bits for class A, 16 bits for class B, 24 bits for class C).
	Subnet route	A route to a specific subnet (having a longer network mask than the network mask derived from the address class).
	Host route	A route to a specific host (with a 32-bit network mask).
	Variable length subnet mask	Performs routing via a VLSM (Variable Length Subnet Mask). This technique allows you to use subnet masks of different lengths within the same network address space.
CIDR routes	Supernet route	A supernet uses a network mask with fewer bits than the classful equivalent. For example, routing information for the four class-C network addresses 192.168.8.0/24, 192.168.9.0/24, 192.168.10.0/24, and 192.168.11.0/24 can be aggregated as a single supernet route 192.168.8.0/22.
	0 subnet route	Network addresses whose subnet is 0 are handled as a single subnetwork. For example, the switch can apply the 0 subnet route to the class-B network address 172.16.0.0/24.
	-1 Subnet route	Network addresses whose subnet is -1 (all 1s) are handled as a single subnetwork. For example, the switch can apply the -1 subnet route to the class-B network address 172.16.255.0/24.
	Inclusive subnets	Routes whose network addresses present an inclusive relationship between multiple pieces of routing information can be handled separately. For example, the switch can apply separate routing information to the class-B network addresses 172.16.3.0/24 and 172.16.2.0/23.