Figure B.3 : control of ingress/download traffic: ask its ISP to change its routing policies(localpref)
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- BGP Tutorial : Practices and Multihoming techniques, regarding an ISP proposing IP transit services.
- Index of Tutorial
- Introduction of the content
- I.1) presentation of the document
- I.2) Overview of the study case: BGP tutorial , best practices and multihoming techniques on ISP proposing IP transit services.
- I.3) Bandwidth Planning and Provisioning for load-balancing features:
- I.4) IP Addresses, subnet pools definition and Interface Assignments:
- Chapter A: BGP general notions, techniques and practices within an ISP
- A.1) BGP practical notions within an ISP
- A.2) Understanding of the peering agreement between the transit providers.
- A.3) Next-hop understanding
- A.4) Recursive lookup interaction between BGP tables and main routing table
- A.5) BGP loop preventions mechanisms
- A.6) Generalities and definitions of common BGP commands
- A.7) Template A: basic BGP mulithoming configuration with 2 ISPs
- A.8) Template B: Merge or fuse multiple physical links into one, for load-sharing or aggregations reasons
- Chapter B: Study case’s traffic engineering concerns, setup and implementation of Ebgp and Ibgp sessions
- B.1) Traffic engineering tools discussions for multihoming purposes
- B.2) Setup of Ebgp sessions.
- B.2.a) Networks pools definition and aggregation implication
- B.2.b) General configuration in both routers of ISP-A.
- B.2.c) Ebgp setup between RT-A and ISP-D-Link1 upstream link.
- B.2.d) Ebgp setup between RT-A and ISP-D-Link2 upstream link.
- B.2.e) Ebgp setup between RT-B and ISP-C upstream link.
- B.2.f) Ebgp setup between RT-B and ISP-B transit/upstream link.
- B.3) Setup of Ibgp connectivity between both routers of ISP-A
- B.4) Notes on network pools aggregations within a BGP session.
- B.5) summary: BGP setup of ISP-A’s router RT-A.
- B.6) summary: BGP setup of ISP-A’s router RT-B.
- Chapter C : Analyze of the BGP configurations, tests and monitoring results of the multihoming and traffic engineering setup.
- C.1) Observations /commentaries of the results and the redundancy scenarios.
- C.1.a) Traffic Analysis 1: Scenario A: Zone-D_E ingress/download traffic, all Ebgp links are up.
- C.1.b) Traffic Analysis 2: Scenario B: Zone-D-E ingress/download traffic, primary link ISP-D is cut.
- C.1.c) Traffic Analysis 3: Scenario C: Zone-D-E ingress/download traffic: primary link ISP-D is cut, secondary backup link ISP-B is cut too.
- C.1.d) Traffic Analysis 4: Scenario D: Zone-D-E ingress/download traffic, primary link ISP-D is restored however secondary backup link ISP-B is still down.
- C.1.e) Traffic Analysis 5: Scenario E: Zone-D-E ingress/download traffic, primary link is still cut however secondary link ISP-B is restored.
- C.2) BGP verification and troubleshooting commands
- C.1) Observations /commentaries of the results and the redundancy scenarios.
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