Extreme Networks ExtremeWare XOS 11.3, Manual

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Overview of IPv4 Unicast Routing
ExtremeWare XOS 11.3 Concepts Guide
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Statically, by way of routes entered by the administrator:
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Default routes, configured by the administrator
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Locally, by way of interface addresses assigned to the system
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By other static routes, as configured by the administrator
NOTE
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.
Static routes can also be used for security reasons, to control which routes you want advertised by the
router. You configure, if you want all static routes to be advertised, using one of the following
commands:
●
enable rip export [bgp | direct | e-bgp | i-bgp | ospf | ospf-extern1 | ospf-
extern2 | ospf-inter | ospf-intra | static] [cost <number> {tag <number>} |
policy <policy-name>]
or
disable rip export [bgp | direct | e-bgp | i-bgp | ospf |
ospf-extern1 | ospf-extern2 | ospf-inter | ospf-intra | static]
●
enable ospf export [bgp | direct | e-bgp | i-bgp | rip | static] [cost <cost>
type [ase-type-1 | ase-type-2] {tag <number>} | <policy-map>]
or
disable ospf
export [bgp | direct | e-bgp | i-bgp | rip | static]
The default setting is disabled. Static routes are never aged out of the routing table.
A static route’s nexthop (gateway) 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.
Multiple Routes
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 default criteria (in the order specified):
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Directly attached network interfaces
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Static routes
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ICMP redirects