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OSPFv2 Four types of OSPF network types

Latest reply: Dec 29, 2018 08:14:13 1322 1 9 0 0

Hi, everyone! Today I’m going to introduce you OSPFv2 (4): Four types of OSPF network types.
1. Point-to-point (Point-to-Point, P2P)
A P2P network is a link where only two devices can be connected, for example, a PPP link.
When two devices are connected through PPP links, the interface encapsulation protocol used on the device is PPP. When OSPF is activated, the OSFP sets the network type to P2P based on the data link layer encapsulation of the interface. When HDLC encapsulation is used, the default network type is P2P.
In the P2P network, five types of OSPF packets are sent through the multicast address 224.0.0.5. By default, an interface sends Hello packets every 10 seconds.

2. Broadcast multi-channel access type (Broadcast Multi-Access, BMA)
The BMA is a broadcast network environment that allows multiple devices to access the network. Any two devices can communicate with each other at Layer 2.
The DR and BDR need to be elected on the BMA network.
The BMA sends Hello packets, LSU packets, and LSAck packets in multicast mode and sends DD packets and LSR packets in unicast mode.
All OSPF routers listen to the multicast address 224.0.0.5. When the multicast address is to be sent to all routers, the destination address is 224.0.0.5..
The DR and BDR listen to the multicast address 224.0.0.6. When the DR and BDR are to be sent to the DR and BDR, the destination address is 224.0.0.6..
Here, the sending refers to the OSPF packet.
By default, the interval for the BMA to send Hello packets is 10s.

3. Non-broadcast multiple access type (Non-Broadcast Multi-Access, NBMA)
Although multiple devices are allowed to access the NBMA network, the NBMA network does not provide the broadcast function. To establish adjacencies smoothly, the sends Hello packets in unicast mode. On an NBMA network, DR and BDR election is also performed.
By default, Hello packets are sent at an interval of 30s.

4. Point-to-multipoint (Point-to-Multipoint, P2MP)
The network type is not set by the interface, but needs to be manually configured by the administrator. In this network, the DR and BDR do not need to be elected.
On a P2MP network interface, OSPF sends Hello packets in multicast mode and sends other packets in unicast mode.
By default, the interval for sending Hello packets is 30S..

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4am
Created Dec 29, 2018 08:14:13

P2P and broadcast are commonly used in the four network types.
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