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The Implementing Cisco IP Routing - ROUTEExam: 642-902
BGP: Border Gateway Protocol
Introduction
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Intro
Introduction to BGP Real Internet BGP Tables
Internet Connection Options: when to implement BGP?
Amount of Updates: how to implement BGP?
BGP in Action
BGP Messages
Neighborship States
Configuration
Neighbor Configuration
Injecting Routes into BGP
Verification and Troubleshooting
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Introduction to BGP
Exterior Gateway Protocol EGP
Uses TCP port 179
Explicitly configured neighbors
NLRI: Network Layer Reachability Information
Wealth of path attributes (PA)
Path vector logic
Public and Private ASNs
Public: 1-64,495
Private: 64,512 - 65,534
Internal and External BGP
iBGP vs. eBGP
AS 100AS 200
AS 400AS 300
140.40.1.0/24140.40.2.0/24
140.40.3.0/24
130.200.14.0/24130.200.15.0/24
130.200.16.0/24
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The Real Deal
IP Lookup
Domain Lookup
AS Lookup
BGP Peering Worldwide
AS 100AS 200
AS 400AS 300
140.40.1.0/24140.40.2.0/24
140.40.3.0/24
130.200.14.0/24130.200.15.0/24
130.200.16.0/24
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Internet Connection Options
Single homed
Dual homed
Single multihomed
ISP 1Customer
ISP 1Customer
ISP 1
Customer
ISP 2
When to implement BGP?
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Internet Connection Options (Contd.)
Dual multihomed
ISP 1
Customer
ISP 2
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Amount of Updates
Default route
Full updates
ISP 1
Customer
ISP 2
ISP 1
Customer
ISP 2
How to implement BGP?
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Amount of Updates Contd.
Partial updates with default route
ISP 1
Customer
ISP 2
130.200.14.0/24130.200.15.0/24
130.200.16.0/24
140.40.1.0/24140.40.2.0/24
140.40.3.0/24
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BGP Messages
Open establish relationship and exchange ASN and MD5 authentication values.
Keepalive maintain the neighbor relationship.
Update exchange prefix/length and the associated PAs
Notification signal BGP error and results in a reset
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Neighborship States
Idle either process administratively down or awaiting the next retry attempt.
Connect waiting for the TCP connection to be completed.
Active TCP connection completed, but no messages sent.
Opensent TCP connection exists, BGP Open message not received
Openconfirm Open message has been both sent to and received
Established parameters match, relationship works, and the peers can now exchange Updatemessages.
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Configuration
Neighborship Specification: using neighbor command
router bgp 2
neighbor 192.168.21.1 remote-as 13
network 192.168.2.0 mask 255.255.255.0
AS 13
AS 2
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Injecting Routes into BGP
BGP network command: the network has to be in the routing table
network 192.168.2.0 or network 192.168.2.0 mask 255.255.255.0
auto-summary effect on network command
network 172.16.0.0
Redistribution from IGP table
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Verification & Troubleshooting
show ip bgp
show ip bgp summary
show ip bgp neighbors
show ip bgp neighbors 192.168.21.1
show ip route bgp
show ip route 192.168.1.1
show ip route 192.168.1.0 255.255.255.0
show ip route 128.107.0.0 255.255.224.0 longer-prefixes
clear ip bgp *
clear ip bgp [13 | 1.1.1.1]
debug ip bgp events
debug ip bgp keepalives
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Summary
Introduction to BGP Real Internet BGP Tables
Internet Connection Options
Amount of Updates
BGP in Action BGP Messages
Neighborship States
Configuration
Neighbor Configuration
Injecting Routes into BGP
Verification and Troubleshooting
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