Maintenance; Ospfv2; Introduction - Raisecom ISCOM2600G-HI (A) Series Configuration Manual

Raisecom
ISCOM2600G-HI (A) Series Configuration Guide

5.6.11 Maintenance

Maintain the ISCOM2600G-HI series switch as below.
Rasiecom#clear rip database
Rasiecom#clear rip statistics

5.7 OSPFv2

5.7.1 Introduction

Open Shortest Path First (OSPF) is a dynamic route selection protocol based on link status.
OSPF referred to in this document is OSPFv2 used for IPv4.
RIP has disadvantages of slow convergence, route loop, and weak expansibility, so it is unfit
for large networks. Compared with RIP, OSPF has the following advantages:
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Network type of OSPF
By types of data link layer protocols, OSPF divides the network into the following types:
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Command
Wide application range: support networks of various sizes, especially large networks.
Fast convergence: after network topology changes, OSPF immediately sends an update
packet, and synchronizes the change in the Autonomous System (AS, the system
composed of routing devices running the same routing protocol for exchanging
information).
No routing loop: according to collected link status, OSPF uses the shortest path tree
algorithm to calculate routes, which guarantees no routing loop.
Area division: OSPF divides the network into different areas for layering management,
and routing information transmitted across areas is further abstracted, thus reducing
occupied network bandwidth.
Equivalent route: OSPF supports multiple equivalent routes to the same destination
address.
Multicast: OSPF supports sending protocol packets with a multicast address in links of
certain types, thus reducing impact on other devices.
Dynamic learning and advertising of public network routes
BFD for OSPF
Broadcast: when the data link layer protocol is Ethernet or FDDI, OSPF takes network
type as broadcast by default. In such networks, OSPF sends protocol packets in multicast
mode (multicast address: 224.0.0.5 and 224.0.0.6).
Point-to-MultiPoint (P2MP): no data link layer protocol is taken as P2MP by default;
instead, this type is forcibly changed from other types. A common method is to change
NBMA to P2MP. In such networks, OSPF sends protocol packets in multicast mode
(multicast address: 224.0.0.5) by default. You can configure OSPF to send packets in
unicast mode as needed.
Raisecom Proprietary and Confidential
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Description
Clear information about RIP routing database.
Clear RIP interface statistics.
5 IP services
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