What is OSPF over Frame Relay?
What is OSPF over Frame Relay?
OSPF uses multicast by default, which is also considered by the router to be of the broadcast variety. If frame-relay by default cannot send broadcasts and OSPF by default needs them to work (hellos, etc) then we need to change something! Enter the OSPF non-broadcast network type.
How do you calculate administrative distance?
You can display the administrative distance of all routes on your router by typing the show ip route command:
- In the case above, the router has only a single route in its routing table learned from a dynamic routing protocols – the EIGRP route.
- RIP has been configured on all routers.
What is the administrative distance of a directly connected route?
An administrative distance is a number between 0 and 255, with the lower number being better. The AD of 0 indicates the most trusted route (the directly connected network). The AD of 255 means that the route will not be trusted.
What is the purpose of administrative distance?
Administrative Distance (AD) is used to rate the trustworthiness of routing information received from the neighbor router. The route with the least AD will be selected as the best route to reach the destination remote network and that route will be placed in the routing table.
What are the OSPF area types?
There are five types of OSPF areas: Backbone area (area 0), Standard area, Stub area, Totally stubby area, and No so stubby area (NSSA).
Why administrative distance is important?
Administrative Distance (AD) is a value that routers use in order to select the best path when there are two or more different routes to the same destination from two different routing protocols. Administrative Distance counts the reliability of a routing protocol.
What is administrative distance used for?
Administrative distance (AD) or route preference is a number of arbitrary unit assigned to dynamic routes, static routes and directly-connected routes. The value is used in routers to rank routes from most preferred (low AD value) to least preferred (high AD value).
What is the difference between metric and administrative distance?
The difference between administrative distance and metric is that AD is used to choose between multiple paths learned via different routing protocols. Metric, on the other hand, is used to choose between multiple paths learned with the same routing protocol.
What does administrative distance mean?
What is Area 0 called in OSPF?
Backbone Area This is the central area in your OSPF routing domain which all areas must connect to. This area is labeled area 0 (or the longhand version 0.0. 0.0).
How is the value of the administrative distance of a route used?
What configuration is necessary for the proper operation of OSPF?
The correct configuration is necessary for the proper operation of OSPF. Frame Relay subinterfaces can run in two modes: Point-to-Point—When a Frame Relay point-to-point subinterface is configured, the subinterface emulates a point-to-point network and OSPF treats it as a point-to-point network type.
What are the modes of a frame relay subinterface?
Frame Relay subinterfaces can run in two modes: Point-to-Point—When a Frame Relay point-to-point subinterface is configured, the subinterface emulates a point-to-point network and OSPF treats it as a point-to-point network type.
What is multipoint in OSPF?
Multipoint—When a Frame Relay multipoint subinterface is configured, OSPF treats this subinterface as an NBMA network type. Cisco IOS software uses the ip ospf network command to allow the flexibility run OSPF on an interface in different modes:
What is the default interface type for OSPF?
When OSPF is configured on a physical interface (for example, interface S0) of a non broadcast multi-access technology such as Frame Relay, the default network type of NON_BROADCAST is assigned. When OSPF is configured on point-to-point subinterfaces, the default interface type of POINT_TO_POINT is assigned.