H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 208)

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Configuring IPv4 and IPv6 routing
The term router in this document refers to routers, access controllers, unified switches, and access
controller modules.
Overview
Upon receiving a packet, a router determines the optimal route based on the destination address and
forwards the packet to the next router in the path. When the packet reaches the last router, it forwards the
packet to the destination host. Routing provides the path information that guides the forwarding of
packets.
A router selects optimal routes from the routing table, and sends them to the forwarding information base
(FIB) table to guide packet forwarding. Each router maintains a routing table and a FIB table.
Static routes are manually configured. If a network's topology is simple, you only need to configure static
routes for the network to work correctly. Static routes cannot adapt to network topology changes. If a fault
or a topological change occurs in the network, the network administrator must modify the static routes
manually.
For more information about routing table and static routing, see "
About the H3C Access Controllers
Web-Based Configuration Guide ."
Configuration guidelines
When you configure a static route, follow these guidelines:
1. If you do not specify the preference when you configure a static route, the default preference is
used. Reconfiguration of the default preference applies only to newly created static routes. The
Web interface does not support configuration of the default preference.
2. When you configure a static route, the static route does not take effect if you specify the next hop
address first and then configure it as the IP address of a local interface, such as an Ethernet
interface and VLAN interface.
3. When specifying the output interface, note that the following guidelines:
If NULL 0 or a loopback interface is specified as the output interface, you do not need to
configure the next hop address.
If a point-to-point interface is specified as the output interface, you do not need to specify the
next hop or change the configuration after the peer address has changed. For example, a PPP
interface obtains the peer's IP address through PPP negotiation, and you only need to specify it
as the output interface.
If you want to specify a broadcast interface (such as an Ethernet interface, virtual template, or
VLAN interface) as the output interface, which might have multiple next hops, you must specify
the next hop at the same time.