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BGP Overview

Learn about the Broader Gateway Protocol (BGP), its characteristics, session establishment, and route processing. Explore basic BGP configuration and policies, including BGP police and filters.

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BGP Overview

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  1. BGP Overview Sumanta Das Gajendra Mahapatra

  2. Content Introduction Session Establishment Route processing Basic Configuration BGP Police

  3. Introduction to BGP BGP : Broader Gateway Protocol - Why Need BGP

  4. Introduction to BGP

  5. Introduction to BGP

  6. Introduction to BGP

  7. Introduction to BGP BGP Characteristics : BGP is distance vector protocol with enhancement - reliable update Triggered updates only Rich metrics (called path attributes) Designed to scale to huge internetworks

  8. Introduction to BGP IBGP EBGP

  9. BGP Session Establishment Neighbor discovery Hold Times Keepalive

  10. BGP Session Establishment

  11. BGP Session Establishment

  12. BGP Session Establishment

  13. BGP Route Processing

  14. BGP Route Processing

  15. BGP Route Processing Routing Loop: IBGP: Split Horizon EBGP: AS path info

  16. Basic BGP Configuration Configuration command Monitoring Command Debug Command

  17. Basic BGP Configuration BGP Routing process : Router(config)#router bgp as-number Configuring External Neighbors : Router(config-router)#neighbor ip-address remote-as as-number To temporarily disable a BGP neighbor: Router(config-router)#neighbor ip-address shutdown Configuring BGP Timers: Router(config-router)#timers bgp keepalive holdtime Per Specific neighbor: Router(config-router)#neighbor [ ip address | peer group name ] timers keepalive holdtime

  18. Basic BGP Configuration Configuring MD5 Authentication: Router(config-router)#neighbor ip-address password string Router(config-router)#no auto-summary Aggregating BGP networks Router(config-router)#aggregate-address address-prefix mask Router(config-router)#aggregate-address address-prefix mask summary-only

  19. Basic BGP Configuration

  20. Basic BGP Configuration BGP command for monitoring: Monitorior neighber info: Router>show ip bgp summary Monitor BGP neighbors on details: Router>show ip bgp neighbor ip-address Monitor bgp table: Router > show ip bgp

  21. Basic BGP Configuration Debugging BGP : Display all tcp transaction : Router#debug ip tcp transactions Display significant BGP event Router#Debug ip bgp events Debug BGp keepalive packets : Router#debug ip bgp keepaklives Display all incoming and outgoing BGp updates : Router#debug ip bgp updates

  22. BGP Policies Needs of BGP policy

  23. BGP Police BGP Filters :

  24. BGP Police BGP Filters:

  25. BGP Police

  26. BGP Police BGP Filters : - As-Path Filters - Prefix-List Filters - Outbound Filters - Route-Maps

  27. BGP Police BGP Filters : - As-Path Filters

  28. BGP Police BGP Filters : - As-Path Filters Configuring BGP AS-Path Filters Router(Config)#ip as-path access-list number permit | deny regexp Router(Config-router)#neighbor ip-address filter-list as-path-filter in|out

  29. BGP Police BGP Filters : - prefix-Based Filters

  30. BGP Police BGP Filters : - prefix-Based Filters Configuration: router(config-router)#neighbor {ip address| peer-group-name } prefix-list list {in| out} Router(config-routeer)#distribution-list prefix-list prefix-list out routing-process

  31. BGP Police BGP Filters : - Outbound Router Filter

  32. BGP Police Outbound Router Filter ORF format ORF message consist of the following fields -AFI/SAFI -ORF type -When to refresh -List of ORF entries ORF entries depends on the ORF type ORF capability needs to be negotiated for every supported ORF type

  33. BGP Police BGP Filters : - Route-map BGP Filters :

  34. BGP Police BGP Filters : - Route-map BGP Filters :

  35. BGP Police BGP Filters : - Route-map BGP Filters :

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