R21xx-HP FlexFabric 11900 Layer 3 IP Routing Configuration Guide

Figure 24 Network diagram

Configuration procedure

1. Configure IP addresses for interfaces.

2. Enable OSPF (see "Configuring basic OSPF").

3. Configure Area 1 as an NSSA area:

# Configure Switch A.

<SwitchA> system-view

[SwitchA] ospf

[SwitchA-ospf-1] area 1

[SwitchA-ospf-1-area-0.0.0.1] nssa default-route-advertise no-summary

[SwitchA-ospf-1-area-0.0.0.1] quit

[SwitchA-ospf-1] quit

# Configure Switch C.

<SwitchC> system-view

[SwitchC] ospf

[SwitchC-ospf-1] area 1

[SwitchC-ospf-1-area-0.0.0.1] nssa

[SwitchC-ospf-1-area-0.0.0.1] quit

[SwitchC-ospf-1] quit

NOTE:

• To allow Switch C in the NSSA area to reach other areas within the AS, you must provide the keyword

default-route-advertise for the nssa command issued on Switch A (the ABR) so that Switch C can obtain

a default route.

• Configuring the nssa command with the keyword no-summary on Switch A can reduce the routing

table size on NSSA Switches. On other NSSA Switches, you only need to configure the nssa command.

# Display OSPF routing information on Switch C.

[SwitchC] display ospf routing

OSPF Process 1 with Router ID 10.4.1.1

Routing Tables

Routing for Network