Extreme Networks 200 Series Populating the Routing Table

Overview of IP Unicast Routing

Summit 200 Series Switch Installation and User Guide 193

Populating the Routing Table

The switch maintains an IP routing table for both network routes and host routes. The table is

populated from the following sources:

•Dynamically, by way of routing protocol packets or by ICMP redirects exchanged with other routers.

•Statically, by way of routes entered by the administrator:

—Default routes, configured by the administrator

—Locally, by way of interface addresses assigned to the system

—By other static routes, as configured by the administrator

NOTE

If you define a default route and then delete the VLAN on the subnet associated with the default route,

the invalid default route entry remains. You must manually delete the configured default route.

Dynamic routes are typically learned by way of RIP or OSPF. Routers that use RIP or OSPF exchange

information in their routing tables in the form of advertisements. Using dynamic routes, the routing

table contains only networks that are reachable.

Dynamic routes are aged out of the table when an update for the network is not received for a period of

time, as determined by the routing protocol.

Static routes are manually entered into the routing table. Static routes are used to reach networks not

advertised by routers.

Static routes can also be used for security reasons, to control which routes you want advertised by the

router. You can decide if you want all static routes to be advertised, using one of the following

commands:

[enable | disable] rip export static

[enable | disable] ospf export static

The default setting is disabled. Static routes are never aged out of the routing table.

A static route must be associated with a valid IP subnet. An IP subnet is associated with a single VLAN

by its IP address and subnet mask. If the VLAN is subsequently deleted, the static route entries using

that subnet must be deleted manually.

When there are multiple, conflicting choices of a route to a particular destination, the router picks the

route with the longest matching network mask. If these are still equal, the router picks the route using

the following criteria (in the order specified):

•Directly attached network interfaces

•ICMP redirects (refer to Table 57, later in this chapter)

•Static routes

•Directly attached network interfaces that are not active.