R0106-HP MSR Router Series Layer 3 - IP Routing Configuration Guide(V7)

Configuring basic IP routing

In this chapter, "MSR2000" refers to MSR2003. "MSR3000" collectively refers to MSR3012, MSR3024,

MSR3044, MSR3064. "MSR4000" collectively refers to MSR4060 and MSR4080.

IP routing directs IP packet forwarding on routers based on a routing table. This chapter focuses on

unicast routing protocols. For more information about multicast routing protocols, see IP Multicast

Configuration Guide.

Routing table

A RIB contains the global routing information and related information, including route recursion, route

redistribution, and route extension information. The router selects optimal routes from the routing table

and puts them into the FIB table. It uses the FIB table to forward packets. For more information about the

FIB table, see Layer 3—IP Services Configuration Guide.

Table 1 c

ategorizes routes by different criteria.

Table 1 Route categor

ies

Criterion Categories

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.

Whether the

destination is directly

connected

• Direct route—The destination is directly connected.

• Indirect route—The destination is indirectly connected.

Origin

• Direct route—A direct route is discovered by the data link protocol on an interface,

and is also called an "interface route."

• Static route—A static route is manually configured by an administrator.

• Dynamic route—A dynamic route is dynamically discovered by a routing protocol.

To view brief information about a routing table, use the display ip routing-table command:

<Sysname> display ip routing-table

Destinations : 19 Routes : 19

Destination/Mask Proto Pre Cost NextHop Interface

0.0.0.0/32 Direct 0 0 127.0.0.1 InLoop0

1.1.1.0/24 Direct 0 0 1.1.1.1 Eth1/1

1.1.1.0/32 Direct 0 0 1.1.1.1 Eth1/1

1.1.1.1/32 Direct 0 0 127.0.0.1 InLoop0

1.1.1.255/32 Direct 0 0 1.1.1.1 Eth1/1

2.2.2.0/24 Static 60 0 12.2.2.2 Eth1/2

80.1.1.0/24 OSPF 10 2 80.1.1.1 Eth1/3

...

A route entry includes the following key items: