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Page 1: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

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Filtering using AS Path Filters

21

Page 2: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

Our Journey

Copyright © 2010 Internetwork Expert, Inc

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• BGP fundamentals

– Injecting networks, iBGP, eBGP, Route

Reflectors, Confederations, Peer Groups

• Policy Based BGP

– Attributes and Filtering

– Manipulating BGP

• Complex Topologies

– Advanced route maps, community, load

balancing, dampening, troubleshooting

Page 3: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

Regular expressions

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Page 4: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

Application

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Page 5: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

AS Path Access-List

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Page 6: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

AS Path access-list as classifier

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Page 7: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

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Page 8: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

Remove private AS from AS_Path

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Page 9: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

Ignore loop prevention of AS_PATH

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Page 10: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

Regular expressions in action

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Page 11: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

Regular expressions continued

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Page 12: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

Regular expressions part 3

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Page 13: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

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Route maps

22

Page 14: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

When multiple filters exist

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Page 15: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

Inject Map

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Page 16: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

Conditional Route Injection

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Page 17: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

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BGP Communities

23

Page 18: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

Change decimal to aa:xx format

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Page 19: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

Configure community for outbound updates

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Page 20: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

R1 sees the community sent

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Page 21: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

Show BGP table based on community

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Page 22: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

R1 modifies local policy based on

community received

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Page 23: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

AS 11 is now preferring the route

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Page 24: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

Agreements between ISPs is the key

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Page 25: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

Well known communities

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Page 26: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

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Load Balancing

24

Page 27: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

BGP Load Balancing

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Page 28: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

iBGP peer R1

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Page 29: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

eBGP peer R6

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Page 30: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

Multiple BGP paths

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Page 31: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

Global Routing Table

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Page 32: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

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Route Dampening

25

Page 33: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

Route map for Dampening

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Page 34: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

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Working with multiple ISPs

26

Page 35: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

Non transit area example.

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Page 36: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

Working with multiple ISPs

• Routing

• AS Translation

• Load Sharing

• Remove private AS

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Page 37: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

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Scalability

27

Page 38: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

Scalability

• Avoid full mesh

– Route Reflectors

– Confederations

• Peer Groups

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Page 39: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

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Optimization

28

Page 40: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

Optimization

• BGP Convergence

– Scan time

– IGP summarization

• MTU discovery

– Ip tcp path-mtu-discovery

• Peer Groups

• Advertisement Interval

• Prefix limits

• Hold queueCopyright © 2010 Internetwork Expert, Inc

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Page 41: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

BGP processes

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Page 42: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

Path MTU discovery

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Page 43: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

Input Queue

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Page 44: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

Modify/Verify input Queue

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Page 45: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

BGP Scan Interval

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Page 46: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

BGP Scan Time

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Page 47: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

Configure Max Prefix from peer

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Page 48: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

Verify max prefix settings

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Page 49: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

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Troubleshooting BGP

29

Page 50: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

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Course Review

30

Page 51: Filtering using AS Path Filters 21 - Amazon S3 · • BGP fundamentals –Injecting networks, iBGP, eBGP, Route Reflectors, Confederations, Peer Groups • Policy Based BGP –Attributes

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Thank you for your participation!

• Keith Barker, CCIE #6783• CCIE Routing and Switching – 2001

• CCIE Security – 2003

• [email protected]

• YouTube - Keith6783


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