H3C Technologies H3C SecPath F1000-E - Manual (Page 276)

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Route Display
NOTE:
The term router in this document refers to both routers and Layer 3 switches.
Routing Overview
This document introduces how to display active routes.
Routing in the Internet is achieved through routers. Upon receiving a packet, a router finds an optimal
route based on the destination address and forwards the packet to the next router in the path until the
packet reaches the last router, which forwards the packet to the intended destination host.
Routing tables play a key role in routing. Each router maintains a routing table, and each entry in the
table specifies which physical interface a packet destined for a certain destination should go out to
reach the next hop (the next router) or the directly connected destination.
Routes in a routing table can be divided into three categories by origin:
• Direct routes: Routes discovered by data link protocols, also known as interface routes.
• Static routes: Routes that are manually configured.
• Dynamic routes: Routes that are discovered dynamically by routing protocols.
A routing table includes the following key items:
• Destination address: Destination IP address or destination network.
• Network mask: Specifies, in company with the destination address, the address of the destination
network. A logical AND operation between the destination address and the network mask yields
the address of the destination network. For example, if the destination address is 129.102.8.10 and
the mask 255.255.0.0, the address of the destination network is 129.102.0.0.
• Outbound interface: Specifies the interface through which a matching IP packet is to be
forwarded.
• IP address of the next hop: Specifies the address of the next router on the path. If only the
outbound interface is configured, its address will be the next hop.
• Priority for the route. Routes to the same destination but having different next hops may have
different priorities and be found by various routing protocols or manually configured. The optimal
route is the one with the highest priority (with the smallest metric).
Route Display
NOTE:
Only active routes are displayed on the route display page.
Select Network > Routing Management > Routing Info from the navigation tree to enter the
route display page, as shown in Figure 1 .