22.05.2017 Views

nx.os.and.cisco.nexus.switching.2nd.edition.1587143046

Nexus Switching 2nd Edition

Nexus Switching 2nd Edition

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

CNTL/Z.<br />

Congo(config)# router <strong>os</strong>pf DataCenter1<br />

Congo(config-router)# passive-interface default<br />

Congo(config-router)#<br />

Congo(config-router)# int vlan 10<br />

Congo(config-if)# no ip <strong>os</strong>pf passive-interface<br />

Congo(config-if)#<br />

OSPF Summarization<br />

The capability of OSPF to summarize routes is restricted to area boundary routers (ABRs)<br />

or autonomous system boundary routers (ASBRs). When a network is summarized, a single<br />

entry with a shorter prefix (commonly called a supernet) is created <strong>and</strong> added to the routing<br />

table as a representation of the longer prefix subnets. In Example 3-39, a summary for<br />

192.168.128.0 /20 is created <strong>and</strong> advertised out interface e1/18 for the network topology<br />

illustrated in Figure 3-6.<br />

Figure 3-6. OSPF Summarization<br />

Note<br />

With this summary, the following networks are represented: 192.168.128.0/24<br />

through 192.168.143.0/24.<br />

Example 3-42 demonstrates how to configure OSPF summarization with a numeric process<br />

ID.<br />

Example 3-42. OSPF Summarization with a Numeric Process ID<br />

Click here to view code image

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

Saved successfully!

Ooh no, something went wrong!