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9 Oct 2011 7 10/9/11. What is BGP? • BGP is an exterior gateway routing protocol used for inter-Autonomous System routing. • Defined in RFC-4271. – tools.ietf.org/html/rfc4271 . www.eecis.udel.edu/~mills/database/papers/bone.pdf .. Non-egress routers learn the AS100 route via iBGP with a next-hop.
Overview. • What is BGP? • BGP Features. • Path Vector Routing Protocol. • Peering and Transit. • BGP General Operation. • BGP Terminology. • BGP Attributes. • Inserting Prefixes into BGP
Introduction to BGP. ISP Workshops. 1. Last updated 4th September 2016 implementation report on BGP. ? RFC4277 describes operational experiences using BGP . AS 102. E. B. D. A. C. Peering. BGP Basics. ? Runs over TCP – port 179. ? Path vector protocol. ? Incremental updates. ? “Internal" & “External" BGP
Configuring Basic Peer Policy Templates 131. What to Do Next 133. Configuring Peer Policy Template Inheritance with the inherit peer-policy. Command 133. Configuring Peer Policy Template Inheritance with the neighbor inherit peer-policy. Command 135. IP Routing: BGP Configuration Guide, Cisco IOS Release 15M&T.
BGP is a standardized exterior gateway protocol (EGP), as opposed to RIP, Version 4 (BGPv4) is the current standard deployment. BGP is considered a “Path Vector" routing protocol. BGP was not built to route within an Autonomous System . in a transit AS, including non-BGP routers, must learn of a route before BGP.
Cisco Public. BGP Basics. ? The Internet is a collection of autonomous systems that are interconnected to allow communication among them. • BGP provides the routing between these autonomous systems. ? BGP is a path vector protocol. ? It is the only routing protocol to use TCP. • OSPF and EIGRP operate directly over IP.
For net N1 in AS1 to send traffic to net N16 in AS16: • AS16 must originate and announce N16 to AS8. • AS8 must accept N16 from AS16. • AS8 must announce N16 to AS1 or AS34. • AS1 must accept N16 from AS8 or AS34. For two-way packet flow, similar policies must exist for N1. AS 1. AS 8. AS 34. AS16. N16. N1
What's Included? 1) Routing Reprise. 2) BGP Basics. 3) BGP Path Selection (many examples). 4) Use of Community Strings. 5) Multiprotocol Extensions to BGP. 1) Multicast Routing Covered. 2) Layer-III VPN (aka VRF) Omitted
24 May 2016 BGP Basics. • The function of BGP is to: • Exchange routing information between autonomous systems. • Guarantee the selection of a loop free path. • BGP4 is the first version of BGP that supports CIDR and route aggregation. • Common IGPs such as RIP, OSPF, and EIGRP use technical metrics.
2001, Cisco Systems, Inc. www.cisco.com. BGP for Internet Service. Providers. BGP for Internet Service. Providers. • BGP Basics (quick recap). • Scaling BGP interface ethernet 5/0 ip address 222.222.10.2 255.255.255.240 router bgp 100 network 220.220.8.0 mask 255.255.252.0 neighbor 222.222.10.1 remote-as 101.
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