Routing Protocol Design: Summarization, Filtering, and Redistribution, Summaries of Network Design

Download Routing Protocol Design: Summarization, Filtering, and Redistribution and more Summaries Network Design in PDF only on Docsity!

Routing Protocol Design

S U M M A R I Z A T I O N , F I L T E R I N G , A N D R E D I S T R I B U T I O N

Summarization

• (^) Big difference between theory and what’s found in reality
• (^) OSPF is elegant with ‘default-information originate’ command
• (^) Need to allow room for growth
• (^) Stub routing and default routes are the ultimate summarization
• (^) Surprisingly, EIGRP isn’t so easy, need a default static route and advertise it.
• (^) Main point of summarization is to limit flooding domain of network changes

Route Redistribution

• (^) Avoid redistribution as much as possible Images courtesy of blog.sina.com.cn
• (^) Most common usage for redistribution is routing protocol migration
• (^) Cisco recommends using Administrative Distance instead

Route Redistribution cont.

• (^) Redistribution is cool and easy, but can cause issues with multiple distribution points Images courtesy of ccnaccnplinux.com
• (^) Cisco recommends route tagging to avoid routing loops
• (^) Don’t only tag, filter!

Q&A What is the default administrative distance of iBGP? A. 90 B. 110 C. 120 D. 200 E. 220