Avaya C360 - Manual (Page 171)

Route Redistribution
Issue 1 July 2006 171
C360 protocol preferences are listed below from the most to the least preferred:
1. Local (directly attached net)
2. High-preference static (manually configured routes)
3. OSPF internal routes
4. RIP
5. OSPF external routes
6. Low-preference static (manually configured routes).
Route Redistribution
Route redistribution is the interaction of multiple routing protocols. OSPF and RIP can be
operated concurrently in the C360. In this case, the C360 can be configured to redistribute
routes learned from one protocol into the domain of the other routing protocol. Similarly, static
routes may be redistributed to RIP and to OSPF. Route redistribution involves metric changes
and sometimes causes routing loops in the presence of other routes with incompatible schemes
for route redistribution and route preferences. Be careful!
The the C360 scheme for metric translation in route redistribution is as follows:
● Static to RIP metric configurable (default 1)
● OSPF internal metric N to RIP metric 1
● OSPF external type 1 metric N to RIP metric 1
● OSPF external type 2 metric N to RIP metric N+1
● Static to OSPF external type 2, metric configurable (default 1)
● RIP metric N to OSPF external type 2, metric N
● Direct to OSPF external type 2, metric 1.
By default, the C360 does not redistribute routes between OSPF and RIP. Redistribution from
one protocol to the other can be configured. By default, static routes are not redistributed to RIP
and OSPF. The C360 allows the user to globally enable redistribution of static routes to RIP, and
separately, to globally enable redistribution of static routes to OSPF. In addition, the C360 lets
the user configure, on a per static route basis, whether the route is to be redistributed to RIP
and OSPF, and what metric (in the range of 1-15). The default state is to enable the route to be
redistributed at metric 1. When static routes are redistributed to OSPF, they are always
redistributed as external type 2.