This tutorial addresses the building blocks of IP routing protocol scalability (hierarchy, redundancy, and addressing and summarization) along with protocol-specific issues. BGP, ISIS and OSPF configurations and parameters are explored. The examples presented include a set of protocol-specific "best practices."
Intended Audience: Network operators and engineers with IP routing experience. Knowledge of the protocols covered is expected.
Introduction
Scope of the Presentation
Agenda
Scalability Building Blocks
Relationship to Convergence and Stability
Impact/Use of Hierarchy/Redundancy/Addressing and Summarization
Hierarchy
Why is hierarchy important?
Brief overview of service placement (per layer.
Redundancy
When is redundancy too much?
IGP Flooding
Addressing and Summarization
Aggregation Methods per protocol
ISIS Scalability
Hierarchy in ISIS
L or L-only networks
Use and limitations of Hierarchical Networks
Route Leaking
Detection and Propagation of Changes
Fast Hellos
LSP Generation
SPF Runs
Exponential Backoff
Other tips...
Overload bit
OSPF Scalability
Hierarchy
Area types and flow of routing information
LSA Filtering
Detection and propagation of changes
Fast Hellos
LSA Generation
SPF Runs
Exponential Backoff
Other tips...
Stub router advertisement
BGP Scalability
iBGP Full Mesh
Route Propagation Requirements
Peer-Groups
Configuration Grouping and UPDATE Generation
Route Reflectors
Deployment (Hierarchy)
Confederations
Deployment
Interaction with IGPs
Detection and Propagation of Changes
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NEXT_HOP Reachability
4.5.3 Route Dampening
Summary and Conclusions
About the Presenter
Alvaro Retana is a Technical Leader in Cisco's IP Routing Deployment
and Scalability Team, where he works first-hand on advanced features in
routing protocols. Alvaro was formerly a technical lead for both the
Internet Service Provider Support Team and the Routing Protocols Team
at the Cisco Technical Assistance Center in Research Triangle Park, NC.