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BGP Protocol

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Border Gateway Protocol
A short introduction to a protocol that can
help you answer age old question:
“Is the Internet down again?”
Note: I will purposely skip over quite a few things in order to finish
at a reasonable time. If you want in depth, you have 4 choices:
1. Read some/all of the books I will list at the end of this
presentation.
2. Read the BGPv4 RFC’s.
3. Watch the BGP videos I will provide links to at the end of this
presentation.
4. Befriend a R/S CCIE and suck their brains dry.

BGP: Why do we need it?
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





It brings order to the Internet (Stability…..sort of).
IGP’s are not built to handle routes for the entire public
Internet (Currently over 300k IPv4 prefixes).
Centralized routing doesn’t work in an environment as
large as the Internet (Scalability).
and many more…..but we get the idea.

Who would invent such a thing?
Yakov Rekhter – Juniper Networks
Formerly of cisco and IBM

Kirk Lougheed - cisco

BGP Over the Years




BGPv1 debuted in 1989 in RFC 1105.
Yakov Rekhter and Kirk Lougheed were
the authors.
BGPv4 debuted in 1994 in RFC 1654.
Yakov Rekhter and Tony Li were the
authors. Current RFC for BGPv4 is 4271.

Yakov Mania!
Since most people are not familiar with Yakov Rekhter,
it is only fitting that he receive his own slide. Why? Bill Gates
gets all the adoration from the systems people and network
people need their own hero.





Co-Authored RFC 1918 (Private IPv4 Addressing)
A Lead Designer of “Tag Switching”
Author or Co-Author of over 70 IETF RFCS
A Lead Designer of MPLS TE and MPLS VPN’s

Do I Need BGP?

Do I Need BGP?

Autonomous System (AS)
Within the Internet, an autonomous
system (AS) is a collection of connected
Internet Protocol (IP) routing prefixes
under the control of one or more network
operators that presents a common, clearly
defined routing policy to the Internet (cf.
RFC 1930, Section 3).
Source: (Internet)

How Does BGP Work?

Choose The Right Path
BGP routing table entry for 68.156.159.0/24 Paths: (13 available, best #9, table
Default-IP-Routing-Table) Advertised to non peer-group peers: 195.28.164.125
3333 6320 2828 29766 193.0.0.56 from 193.0.0.56 (193.0.0.56) Origin IGP,
localpref 100, valid, external Community: 6320:21000 6320:21310 Last update:
Sat Sep 12 00:54:11 2009
34225 1299 2828 29766 193.138.164.1 from 193.138.164.1 (193.138.164.1)
Origin IGP, localpref 100, valid, external Community: 34225:1000 34225:1001
Last update: Fri Sep 11 12:5...
Border Gateway Protocol
Border Gateway Protocol
A short introduction to a protocol that can
A short introduction to a protocol that can
help you answer age old question:
help you answer age old question:
“Is the Internet down again?”
“Is the Internet down again?”
Note
Note
: I will purposely skip over quite a few things in order to finish
: I will purposely skip over quite a few things in order to finish
at a reasonable time. If you want in depth, you have 4 choices:
at a reasonable time. If you want in depth, you have 4 choices:
1.
1.
Read some/all of the books I will list at the end of this
Read some/all of the books I will list at the end of this
presentation.
presentation.
2.
2.
Read the BGPv4 RFC’s.
Read the BGPv4 RFC’s.
3.
3.
Watch the BGP videos I will provide links to at the end of this
Watch the BGP videos I will provide links to at the end of this
presentation.
presentation.
4.
4.
Befriend a R/S CCIE and suck their brains dry.
Befriend a R/S CCIE and suck their brains dry.
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