More Related Content
Similar to Introduction to Wide Area Network Routing (20)
More from Network Utility Force (11)
Introduction to Wide Area Network Routing
- 1. InteropNet LV 2013
Intro to Wide Area Routing
1Network Utility Force LLC, 15 Wieuca Trace Northeast, Atlanta, Georgia, 30342 -- +1-404-635-6667 -- sales@netuf.net Ā© 2012,
Network Utility Force LLC Companyconfidential information, transmittal to third parties by prior permission only
- 2. Agenda
ā¢ Introduction
ā¢ Review concepts
ā¢ Goals of BGP
ā¢ BGP in Practice
ā¢ Conclusion
Network Utility Force LLC, 15 Wieuca Trace Northeast, Atlanta, Georgia, 30342 -- +1-404-635-6667 -- sales@netuf.net Ā© 2012,
Network Utility Force LLC Companyconfidential information, transmittal to third parties by prior permission only 2
- 3. Introduction
ā¢ The Internet is made up of a bunch of different
organizations
ā Big ISPs
ā Little ISPs
ā Enterprises
ā¢ Everyone needs to exchange traffic with everyone
elseā¦mostly
ā¢ Need to be able to create policy for how traffic is
sent and received, over what paths and deal with
redundancy
Network Utility Force LLC, 15 Wieuca Trace Northeast, Atlanta, Georgia, 30342 -- +1-404-635-6667 -- sales@netuf.net Ā© 2013,
Network Utility Force LLC Company confidential information, transmittal to third parties by prior permission only 3
- 4. Concept Review
ā¢ What is routing?
ā Forwarding
ā¢ Every packet has a destination IP address
ā¢ Address is looked up in the local routerās routing table (FIB ā
Forwarding Information Base)
ā¢ Packet is routed (forwarded) out the proper interface
ā Routing Protocol
ā¢ Proscribes a method for how routes get into the FIB
ā¢ Many are available that fulfill different needs and situations
ā Static
ā IGP
Ā» RIP
Ā» EIGRP
Ā» OSPF & ISIS
ā EGP
Ā» BGP
Network Utility Force LLC, 15 Wieuca Trace Northeast, Atlanta, Georgia, 30342 -- +1-404-635-6667 -- sales@netuf.net Ā© 2013,
Network Utility Force LLC Company confidential information, transmittal to third parties by prior permission only 4
- 5. Goals of BGP
ā¢ Tell your organizationās neighbors about the
destinations you are able to reach
ā¢ Provide controls to influence the path traffic
takes to get to you as well as how it leaves
your network
ā¢ Distribute global routing information
throughout your network
ā¢ Easily filter what you send and what you
receive
Network Utility Force LLC, 15 Wieuca Trace Northeast, Atlanta, Georgia, 30342 -- +1-404-635-6667 -- sales@netuf.net Ā© 2013,
Network Utility Force LLC Company confidential information, transmittal to third parties by prior permission only 5
- 6. BGP Concepts
ā¢ AS
ā An autonomous system is a network typically
controlled by a single entity, usually one per
company
ā Assigned a 4 byte (was 2 byte) number to identify
it, an ASN
Network Utility Force LLC, 15 Wieuca Trace Northeast, Atlanta, Georgia, 30342 -- +1-404-635-6667 -- sales@netuf.net Ā© 2013,
Network Utility Force LLC Company confidential information, transmittal to third parties by prior permission only 6
- 7. BGP Concepts
ā¢ iBGP (internal BGP)
ā Distributes information throughout your AS
ā All iBGP routers must talk directly to all other
routers or use scalability features such as route
reflectors or confederations
ā iBGP is NOT an IGP, it is not intended to tell every
router about the paths in your AS, instead it tells
routers about global connectivity
ā You must still run an IGP such as OSPF, as BGP
depends on it for local connectivity
Network Utility Force LLC, 15 Wieuca Trace Northeast, Atlanta, Georgia, 30342 -- +1-404-635-6667 -- sales@netuf.net Ā© 2013,
Network Utility Force LLC Company confidential information, transmittal to third parties by prior permission only 7
- 8. BGP Concepts
ā¢ eBGP (external BGP)
ā eBGP is used to speak to your network neighbors,
usually your upstream transit provider
ā Your network neighbors use eBGP to send you
routing information about reachability in the rest
of the world
Network Utility Force LLC, 15 Wieuca Trace Northeast, Atlanta, Georgia, 30342 -- +1-404-635-6667 -- sales@netuf.net Ā© 2013,
Network Utility Force LLC Company confidential information, transmittal to third parties by prior permission only 8
- 9. BGP in practice
ā¢ Globally all ISPs āpeerā with each other
ā¢ An entire ecosystem has developed around
BGP peering, mostly based on the amount of
traffic exchanged
ā¢ Exchanges where multiple service providers
come together are located in many major
cities across the world, known as IX (Internet
eXchange)
Network Utility Force LLC, 15 Wieuca Trace Northeast, Atlanta, Georgia, 30342 -- +1-404-635-6667 -- sales@netuf.net Ā© 2013,
Network Utility Force LLC Company confidential information, transmittal to third parties by prior permission only 9
- 10. Routing Table Growth
ā¢ Size of the global routing table is currently
around 455,000 routes for v4 and 12,600 v6
routes
ā¢ Depletion of IPv4 address space may cause
ādeaggregationā of the IPv6 global routing
table, which could result in explosive growth
ā¢ Growth of IPv6 also could result in rapid
growth of the global routing table
Network Utility Force LLC, 15 Wieuca Trace Northeast, Atlanta, Georgia, 30342 -- +1-404-635-6667 -- sales@netuf.net Ā© 2013,
Network Utility Force LLC Company confidential information, transmittal to third parties by prior permission only 10
- 11. Network Utility Force LLC, 15 Wieuca Trace Northeast, Atlanta, Georgia, 30342 -- +1-404-635-6667 -- sales@netuf.net Ā© 2013,
Network Utility Force LLC Company confidential information, transmittal to third parties by prior permission only 11
Brandon Ross ā Chief Network Architect ā Network Utility Force ā bross@netuf.net