OVERVIEW OF IP UNICAST ROUTING
POPULATING THE ROUTING TABLE
The Summit 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 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 Summit
—By other static routes, as configured by the administrator
If you define a default route, and subsequently 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
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
Static routes are manually entered into the routing table. Static routes are used to reach networks not advertised by routers. You can configure up to 64 static unicast routes on the Summit.
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 exportstatic
[enable disable] ospf exportstatic
The default setting is enabled. Static routes are never aged out of the routing table.
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