Optimal External Route Selection: Tips and Techniques for ISPs
Overview
BGP Concept Review
BGP Intro
BGP Peering
The BGP Route
BGP Route Attributes
BGP Policy
BGP Best-Route Selection
BGP Selection, Summary
Safe Routing
Safe Routing - Filtering
“I am Blackholio”
Determining Policy
Connection Quality
PPT Slide
Peering Points
Hot-Potato
Asymmetry
Review: Policy
Goals
Using MEDs
Introduction to MEDs
Setting MEDs for Internal Route
Setting MEDs
Network Diagram
Network Diagram w/ MEDs
Route Maps in DC
What this Does
Slight Improvement?
Using as-path Padding
as-path padding
route-maps
Using local-prefs
Local-prefs
Implementing Policy
Problem: Prefers Bad Paths
Listening to MEDs
Listening to MEDs: Same Peer
route-map on DC, v2
MEDs from Diff. eBGP Peers
Setting MEDs on External Routes
Preferring External Routes w/ MEDs
Active Route Override
Overriding BGP
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