Ip Routing Basics; Ip Routing Overview; Routing Table - HP 3600 v2 series Configuration Manual

IP routing basics

NOTE:
The term
•
The types of interfaces that appear in any figures other than the network diagrams for configuration
•
examples are for illustration only. Some of them might be unavailable on your switch.
• The term
route-mode (or Layer 3) Ethernet ports. You can set an Ethernet port to operate in route mode by using
the port link-mode route command (see
The 3600 v2 SI Switch Series does not support OSPF, BGP, IS-IS, OSPFv3, IPv6 BGP, or IPv6 IS-IS.
•

IP routing 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 then
forwards the packet to the destination host.
Routing provides the path information that guides the forwarding of packets.
Routes can be divided into the following categories by destination:
Network route—The destination is a network. The subnet mask is less than 32 bits.
•
Host route—The destination is a host. The subnet mask is 32 bits.
•
Routes can be divided into the following types based on whether the destination is directly connected to
the router:
Direct routes—The destination is directly connected to the router.
•
Indirect routes—The destination is not directly connected to the router.
•

Routing table

Introduction to routing table
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.
Routes in a routing table can be divided into the following categories by origin:
• Direct routes—Routes discovered by data link protocols, also known as "interface routes"
Static routes—Routes manually configured. Static routes are easy to configure and require less
•
system resources. They work well in small and stable networks. Static routes cannot adjust to
network changes. You must manually configure the routes again whenever the network topology
changes.
• Dynamic routes—Routes discovered dynamically by routing protocols
Each entry in the FIB table specifies a physical interface that packets destined for a certain address
should go out to reach the next hop—the next router—or the directly connected destination.
router
in this document refers to both routers and Layer 3 switches.
interface
in the routing features refers to Layer 3 interfaces, including VLAN interfaces and
Layer 2—LAN Switching Configuration Guide
1
).