
Customizing OSPF Services
114065 Rev. A 5-13
Configuring OSPF for Equal-Cost Multipath Routing
By default, the IP routing table contains a single “best” OSPF route to a given
destination. If OSPF submits another route to the same destination, IP compares
the new route with the current route. If the new route is better, IP replaces the
current route with the existing new route. If not, IP discards the new route.
If you have enabled equal-cost multipath support on the router, IP can store
multiple equal-cost best routes in the routing table. When OSPF submits a route to
a destination, one of the following events occurs:
• IP determines that the current route to that destination is better than the new
route. IP discards the new route.
• IP determines that the new route is better than the current route. IP discards
the current route and replaces it with the new route. In the event that the
routing table contains multiple equal-cost best routes, IP discards all of these
routes.
• IP determines that the new route and the current route have the same cost. IP
adds the new route to the routing table -- up to a maximum number that you
specify. If the routing table already contains the maximum number of
equal-cost routes learned from OSPF, IP discards the routes.
You can use Site Manager to specify the number of equal-cost routes (up to five)
that IP can store in the routing table.
For information about configuring equal-cost multipath support on the router, see
“Enabling Equal-Cost Multipath Support” on page 3-11.
Site Manager: OSPF Maxium Path parameter: page A-77
Kommentare zu diesen Handbüchern