02.10.2013 Views

FTOS Configuration Guide for the C-Series - Force10 Networks

FTOS Configuration Guide for the C-Series - Force10 Networks

FTOS Configuration Guide for the C-Series - Force10 Networks

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

Configure stub areas<br />

OSPF supports different types of LSAs to help reduce <strong>the</strong> amount of router processing within <strong>the</strong> areas.<br />

Type 5 LSAs are not flooded into stub areas; <strong>the</strong> Area Border Router (ABR) advertises a default route into<br />

<strong>the</strong> stub area to which it is attached. Stub area routers use <strong>the</strong> default route to reach external destinations<br />

To ensure connectivity in your OSPF network, never configure <strong>the</strong> backbone area as a stub area.<br />

Use <strong>the</strong>se commands in <strong>the</strong> following sequence, starting in EXEC Privileged mode to configure a stub<br />

area.<br />

Step Command Syntax Command Mode Usage<br />

1 show ip ospf database<br />

database-summary<br />

2<br />

3<br />

4<br />

Use <strong>the</strong> show ip ospf database database-summary command syntax (Figure 387) in <strong>the</strong> EXEC<br />

Privilege mode To view which LSAs are transmitted.<br />

Figure 386 Command Example: show ip ospf database database-summary<br />

To view in<strong>for</strong>mation on areas, use <strong>the</strong> show ip ospf command in <strong>the</strong> EXEC Privilege mode.<br />

Enable passive interfaces<br />

EXEC Privileged Review all areas after <strong>the</strong>y were configured to<br />

determine which areas are NOT receiving type<br />

5 LSAs.<br />

configure EXEC Privileged Enter <strong>the</strong> CONFIGURATION mode.<br />

router ospf process-id CONFIGURATION Enter <strong>the</strong> ROUTER OSPF mode.<br />

Process ID is <strong>the</strong> ID assigned when configuring<br />

OSPF globally (page 540).<br />

area area-id stub<br />

[no-summary]<br />

CONFIG-ROUTER-<br />

OSPF<br />

<strong>Force10</strong>#show ip ospf database database-summary<br />

OSPF Router with ID (10.1.2.100) (Process ID 34)<br />

Area ID Router Network S-Net S-ASBR Type-7 Subtotal<br />

2.2.2.2 1 0 0 0 0 1<br />

3.3.3.3 1 0 0 0 0 1<br />

<strong>Force10</strong>#<br />

Configure <strong>the</strong> area as a stub area. Use <strong>the</strong><br />

no-summary keywords to prevent<br />

transmission in to <strong>the</strong> area of summary ASBR<br />

LSAs.<br />

Area ID is <strong>the</strong> number or IP address assigned<br />

when creating <strong>the</strong> Area (page 542).<br />

A passive interface is one that does not send or receive routing in<strong>for</strong>mation. Enabling passive interface<br />

suppresses routing updates on an interface. Although <strong>the</strong> passive interface will nei<strong>the</strong>r send nor receive<br />

routing updates, <strong>the</strong> network on that interface will still be included in OSPF updates sent via o<strong>the</strong>r<br />

interfaces.<br />

544 Open Shortest Path First

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!