Free Trial

Safari Books Online is a digital library providing on-demand subscription access to thousands of learning resources.

  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint
Share this Page URL
Help

3: BGP Migrations > 3.3 Generic Strategies for BGP Migrations

3.3 Generic Strategies for BGP Migrations

As described in the motivations section, Section 3.1, changes to the IBGP topology and AS renumbering are the main reasons to undergo modifications in the BGP infrastructure. This section discusses strategies to address these types of migration.

3.3.1 Leverage protocol layering

It is common practice to leave infrastructure routes to the IGP, leaving to IBGP the task of carrying the bulk of services identified by end-customer prefixes. BGP leverages the IGP protocol to set up its control plane, establishing TCP sessions between router loopback addresses, and relies on this IGP information to perform recursive BGP next-hop resolution. Splitting or merging IGPs modifies the reachability information required for the BGP control plane. A good strategy is to divide and conquer to simplify the migration exercise, by maintaining independence of IGP and IBGP migration activities whenever possible.


  

You are currently reading a PREVIEW of this book.

                                                                                                                    

Get instant access to over $1 million worth of books and videos.

  

Start a Free 10-Day Trial


  
  • Safari Books Online
  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint