#Ip route summary calculator how to
#Ip route summary calculator software

SPF algorithm last executed 00:24:42.268 ago Routing Process 'ospf 1' with ID 10.1.1.1 SPF algorithm last executed 00:22:45.848 ago

Number of interfaces in this area is 2 (1 loopback) Number of DoNotAge external and opaque AS LSA 0 Number of DCbitless external and opaque AS LSA 0 Maximum wait time between two consecutive SPFs 10000 msecs Minimum hold time between two consecutive SPFs 10000 msecs Router is not originating router-LSAs with maximum metric Static, includes subnets in redistribution It is an autonomous system boundary router

Routing Process 'ospf 1' with ID 10.5.5.5 You can use these commands in order to verify the redistribution: R5# show ip ospf Without this keyword, OSPF only redistributes major nets that are not subnetted. Note: If a metric is not specified, OSPF puts a default value of 20 when it redistributes routes from all protocols except Border Gateway Protocol (BGP) routes, which receive a metric of 1. When there is a major net that is subnetted, you must use the keyword subnet in order to redistribute protocols into OSPF. A Type 1 route is always preferred over a Type 2 route for the same destination.Ĭonsider this network topology to check the LSA Type 5 received on R4 in Area 0 that originated from ASBRs in Area 1. R2 and R3 are Area Border Routers (ABRs).įor simplicity, this configuration redistributes the static route on ASBRs in Area 1 Router R5 and R1. A Type 1 cost is the addition of the external cost and the internal cost used to reach that route. The cost of a Type 2 route is always the external cost, irrespective of the interior cost to reach that route. The difference between the two is in the way the cost (metric) of the route is calculated. If you redistribute routes into OSPF from other routing protocols or from static, it causes these routes to become OSPF-external routes. External routes fall under two categories, external type 1 (O E1) and external type 2 (O E2). If your network is live, make sure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment.

#Ip route summary calculator software

This document is not restricted to specific software and hardware versions.

#Ip route summary calculator how to

It presents a network scenario with the configuration for how to select the route received from one Autonomous System Boundary Router (ASBR) over another.Ĭisco recommends that you have knowledge of OSPF and IP Routing.

This document describes the Open Shortest Path First (OSPF) Link State Advertisement (LSA) Type 5 External Route Selection mechanism.