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Configuration Guide - IP Unicast Routing

S7700 and S9700 V200R013C00

This document describes the configurations of IP Unicast Routing, including IP Routing, Static Route, RIP, RIPng, OSPF, OSPFv3, IPv4 IS-IS, IPv6 IS-IS, BGP, Routing Policy, IP Routing Table Management, and PBR.
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Configuring OSPF Attributes on Different Types of Networks

Configuring OSPF Attributes on Different Types of Networks

Applicable Environment

By setting network types for OSPF interfaces and adjusting the OSPF attributes, you can flexibly build OSPF networks.

In Table 5-19, OSPF classifies networks into four types based on the types of link layer protocols.

Table 5-19  Network types supported by OSPF

Network Type

Characteristic

Default Configuration

Broadcast

On a broadcast network, Hello packets, LSU packets, and LSAck packets are transmitted using multicast; DD packets and LSR packets are transmitted using unicast.

If the link layer protocol is Ethernet or Fiber Distributed Data Interface (FDDI), OSPF regards the network as a broadcast network by default.

Non-broadcast multiple access (NBMA)

On an NBMA network, Hello packets, DD packets, LSR packets, LSU packets, and LSAck packets are transmitted using unicast.

An NBMA network must be fully meshed. That is, any two switches on an NBMA network must be directly reachable.

If the link layer protocol is ATM, OSPF regards the network as an NBMA network by default.

Point-to-point (P2P)

On a P2P network, Hello packets, DD packets, LSR packets, LSU packets, and LSAck packets are transmitted using multicast.

If the link layer protocol is PPP, HDLC, or Link Access Procedure Balanced (LAPB), OSPF regards the network as a P2P network by default.

Point-to-multipoint (P2MP)

On a P2MP network, Hello packets are transmitted using multicast; DD packets, LSR packets, LSU packets, and LSAck packets are transmitted using unicast.

OSPF does not regard a network as a P2MP network by default regardless of its link layer protocol. A P2MP network must be forcibly changed from another network type.

As described in Table 5-19, the difference between OSPF configurations on four types of networks lies in the packet transmission mode.

Pre-configuration Tasks

Before configuring OSPF attributes on different types of networks, complete the following tasks:

Configuration Procedure

Configuring network types of OSPF interfaces is the prerequisite for configuring P2MP or NBMA network attributes.

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Updated: 2019-04-08

Document ID: EDOC1100065744

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