Extreme Networks ExtremeWare XOS 10.1, Руководство пользователя

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Overview of IP Unicast Routing
ExtremeWare XOS 10.1 Concepts Guide 177
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 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 can decide 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 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.