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CLI-based Configuration Guide - IP Unicast Routing

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R009

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Static Default Routes

Static Default Routes

When the destination IP address is set to all 0s, a default route is configured. The default route can be automatically generated by a routing protocol or manually configured. The default route manually configured 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

As shown 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, only a default route from RouterC to RouterB can replace the three static routes destined for networks 1, 2, and 3 in the preceding example.

Updated: 2019-12-27

Document ID: EDOC1000174069

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