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Configuration Guide - IP Unicast Routing

CloudEngine 12800 and 12800E V200R002C50

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, and PBR.

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Static Default Routes

Static Default Routes

A default route has all 0s as its destination IP address. The default route can be automatically generated by a routing protocol or manually configured. The manually configured default route simplifies network configuration. If the destination address of a packet fails to match any entry in the routing table, the router selects the default route to forward the packet.

Figure 2-5 Networking diagram of static routes

In Figure 2-5, if no static default route is configured, you need to configure static routes destined for networks 3, 4, and 5 on RouterA, configure static routes destined for networks 1 and 5 on RouterB, and configure static routes destined for networks 1, 2, and 3 on RouterC. In this way, RouterA, RouterB, and RouterC can communicate with each other.

The next hop of the packets sent by RouterA to networks 3, 4, and 5 is RouterB. Therefore, a default route configured on RouterA can replace the three static routes destined for networks 3, 4, and 5 in the preceding example. Similarly, just one default route from RouterC to RouterB can replace the three static routes destined for networks 1, 2, and 3 in the preceding example.

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Updated: 2019-03-21

Document ID: EDOC1000166601

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