#Ospf network types serial
#Ospf network types windows

Depending on the metric type, the metric can be fixed or increasing. Metric is the seed metric given at redistribution in ASBR. The external LSA contains the network address of the non-OSPF domain, the subnet mask and the metric and forwarding address to reach that network.

External LSA allows network addresses from non-OSPF domains to be advertised within the OSPF domain. The AS external LSA is generated by the ASBR. LSA Type 5 AS external LSA ( or simply “external LSA”) is the LSA that is created when a non-OSPF domain is connected. The difference is that the ASBR router ID is written instead of the network address, and the subnet mask is “0.0.0.0”. The format of the Network Summary LSA and the ASBR Summary LSA is identical. An ASBR summary LSA is also LSA generated by the ABR the information contained in the ASBR summary LSA is the router ID of the ASBR and the metric used to reach the ASBR. LSA Type 4 ASBR summary LSA is the LSA that is generated when a non-OSPF domain is connected. So, we will configure route summary: by performing route summary in ABR, we can reduce the number of network summary LSAs generated by ABR. As more networks are included in other areas, the number of network summary LSAs generated by the ABR will also increase. One network summary LSA is generated for each network address. There is not much need to know the detailed network diagram of other areas, and the network summary LSA is an overview of network addresses. At the same time, the ABR advertises the network address contained in the area under its own control to the backbone area. The ABR advertises the network addresses of other areas that can be reached via the backbone area to the areas under its own control. The router that generates the network summary LSA is the ABR. LSA Type 3 Network Summary LSA is the LSA that is generated when an OSPF network is divided into areas. network LSAs generated by the DR are flooded to all within the area.

Specifically, it contains the IP address of the DR, a list of routers connected to the multi-access network and the subnet mask of the multi-access network. The network LSA shows the connection of an OSPF router on a multi-access network. The DR is a router that represents a multi-access network. LSA Type 2 Network LSA is generated by the DR on each multi-access network. The figure below shows the information contained in a router LSA and how it is flooded. However, what kind of information is included depends on the type of link. The specifics of the link information include the type of link, cost, IP address, and router ID of the neighbor. The router LSA contains all the OSPF router link (OSPF enabled interface connections) information. The generated router LSAs are then flooded all within the area. LSA Type 1 Router LSA is the most basic LSA and is generated by all OSPF routers.

2.For each LSA, this section describes the router that generates it, the scope that is advertised, and the content that is included.

#Ospf network types windows

1.6K MCSA / MCSE on Windows 2012 General.

I would be very interested if you learn the reason for it though. The DR/BDR handles most of the tasks, and some fault-tolerance is built into it by the BDR being able to take over after a DR breakdown. On 'real' LAN's with broadcast capability you save alot of management and OSPF packets by using the broadcast option. In this scenario it certainly eases both configuration and management to use point-to-point, because you dont have to make sure the right DR is choosen by tweaking the election. In theory you have a one-to-many sort of connectivity, but you have no inherent broadcast capability. But where the OSPF network types really comes into play, is on NBMA (Non-Broadcast Multiple Access) networks, such as frame-relay.

#Ospf network types serial

I thought Point to Point is used just for serial WAN connection ? They even used it in leased line WAN connection.Ĭant tell you why your company choose to use that unfortunally. LAN is using ethernet cable and WAN is using leased line.įor Layer 3 Routing, Alll of the routers are configured using point to point OSPF network, both in LAN and WANīased on theory in BSCI book, I thought that for OSPF in LAN, It is better to use Broadcast where we elect BR/BDR.ĭo you know why for all of LAN/WAN, my company are only using OSPF Point to Point ? In my company where I work, Core routers 6500s are connected directly both in LAN and WAN. Do you know when to use OSPF network type - point to point or broadcast ?