Ip Routing And Routing Table - H3C S3610-28P Operation Manual

Operation Manual – Routing Overview
H3C S3610&S5510 Series Ethernet Switches
Chapter 1 IP Routing Overview
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IP Routing and Routing Table

Routing Protocol Overview
Displaying and Maintaining a Routing Table
Note:
The term "router" in this document refers to a Layer 3 switch running routing
protocols.
Verify that the system already operates in IPv4/IPv6 dual-stack mode before
configuring IPv6 routing. For dual-stack mode configuration, see the part covering
dual-stack in the IPv6 Configuration module.
1.1 IP Routing and Routing Table
1.1.1 Routing
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.
1.1.2 Routing Through a Routing Table
I. Routing table
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.
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Chapter 1 IP Routing Overview