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Exterior Gateway Protocol ,[object Object],[object Object],[object Object],[object Object],[object Object]
The Origins of EGP ,[object Object]
Operation of EGP ,[object Object]
Shortcomings of EGP ,[object Object]
Configuring EGP ,[object Object]
Troubleshooting EGP ,[object Object]
Exterior Gateway Protocol ,[object Object],[object Object],[object Object]
The Origins of EGP ,[object Object],[object Object],[object Object]
Eric Rosen, records the scalability problems: ,[object Object]
Eric Rosen, Continue.. ,[object Object]
[object Object],[object Object],Eric Rosen, Continue..
[object Object],[object Object],The Origins of EGP Continue..
EGP Topology Issues ,[object Object],[object Object]
[object Object],[object Object],EGP Topology Issues Continue..
[object Object],[object Object],EGP Topology Issues Continue..
[object Object],[object Object],EGP Topology Issues Continue..
EGP Topology Issues Continue..  To Prevent Routing Loops, Only Core Gateways Can Send  information Learned from One AS to Another AS
EGP Functions ,[object Object],[object Object],[object Object],[object Object],[object Object]
EGP Message Types
Neighbor Acquisition Protocol ,[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],Neighbor Acquisition Protocol Continue
Example 1-1 debug ip egp transactions Command Output Displays EGP State Transitions
Neighbor Reachability Protocol ,[object Object],[object Object]
Example 1-2 debug ip egp transactions Command Output Displays Two-Way Handshake Success and EGP State Transitions
[object Object],[object Object],[object Object],Neighbor Reachability Protocol Continue..
Example 1-3 The Neighbor at 192.168.16.2 Has Stopped Responding. The Interval Between Each of the Unacknowledged EGP Messages Is 60 Seconds
Example 1-3. Continue..
Network Reachability Protocol ,[object Object],[object Object],[object Object]
Example 1-5 EGP Neighbors Poll Each Other Periodically for Network Reachability Updates
Example 1-5 Continue..
[object Object],[object Object],[object Object],Network Reachability Protocol
Figure 1-3 illustrates the concept of indirect EGP neighbors. One router, Moe, is a core gateway and  is peered with three other gateways.
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Network Reachability Protocol Continue..
Example 1-6 shows the routing table of Shemp and the route entries resulting from the Update in Example 1-5.
[object Object],[object Object],[object Object]
Shortcoming of EGP ,[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],Shortcoming of EGP
Configuring EGP ,[object Object],[object Object],[object Object],[object Object],[object Object]
Case Study: An EGP Stub Gateway Figure 1-10 shows an EGP stub gateway in AS 65502, connected to a core gateway in AS 65501. The IGP of the stub AS is RIP.
Example 1-7 Stub Gateway Configuration for Figure 1-10 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example 1-8 Buster's Routing Table Shows Entries Learned from the EGP  Neighbor and from the Interior RIP Neighbors ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example 1-9 Routing Table from a Router Interior to AS 65502 Shows the  Redistributed EGP Routes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],Example 1-9 Routing Table from a Router Interior to AS 65502 Shows the  Redistributed EGP Routes
Example 1-10 Stan's Routing Table Shows That None of the Interior Networks from AS 65502 Are Being Learned from Buster ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example 1-11 Buster Configuration to Advertise All Networks in AS 65502 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example 1-12 Buster Is Now Advertising the Interior Networks of AS 65502 to Stan ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Case Study: An EGP Core Gateway ,[object Object],[object Object]
Figure 1-11. Core Router Stan Must Peer with Both Remote Neighbor Buster and Local Neighbor Ollie
Example 1-13 Core Gateway Configuration for Network Topology in Figure 1- 11 ,[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object]
Example 1-14 Neighbor Configuration for Ollie in the Network Topology of Figure 1-11 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Figure 1-12. Spanky and Buckwheat Must Peer Only with Stan, Whereas Alfalfa Must Peer Only with Ollie
Example 1-15 Regulating Peering with Access Lists Using the neighbor any Command ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],Example 1-15 Regulating Peering with Access Lists Using the neighbor any Command
Case Study: Indirect Neighbors ,[object Object],[object Object],[object Object]
Figure 1-13. EGP Indirect Neighbors
Example 1-17 Advertising Indirect EGP Neighbors to One Another Enables the Routing of Packets Between Indirect EGP Neighbors  ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example 1-18 shows the core gateway's indirect neighbors recorded as Third Party.
Example 1-19 Routing Table Displays Next-Hop Routes to Indirect Neighbors
Case Study: Default Routes ,[object Object],[object Object],[object Object]
Example 1-20 Advertising a Default Route ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example 1-21 192.168.20.1 Is Reachable as a Result of the Default Route
Troubleshooting EGP ,[object Object],[object Object],[object Object]
Interpreting the Neighbor Table ,[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Interpreting the Neighbor Table Continue..
[object Object],Interpreting the Neighbor Table Continue.. ,[object Object]
[object Object],Interpreting the Neighbor Table Continue..
Case Study: Converging at the Speed of Syrup ,[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Case Study: Converging at the Speed of Syrup
Example 1-25 New Network Updates Are Not Being Advertised ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],Case Study: Converging at the Speed of Syrup Continue..
 

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1 egp

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  • 17. EGP Topology Issues Continue.. To Prevent Routing Loops, Only Core Gateways Can Send information Learned from One AS to Another AS
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  • 22. Example 1-1 debug ip egp transactions Command Output Displays EGP State Transitions
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  • 24. Example 1-2 debug ip egp transactions Command Output Displays Two-Way Handshake Success and EGP State Transitions
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  • 26. Example 1-3 The Neighbor at 192.168.16.2 Has Stopped Responding. The Interval Between Each of the Unacknowledged EGP Messages Is 60 Seconds
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  • 29. Example 1-5 EGP Neighbors Poll Each Other Periodically for Network Reachability Updates
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  • 32. Figure 1-3 illustrates the concept of indirect EGP neighbors. One router, Moe, is a core gateway and is peered with three other gateways.
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  • 34. Example 1-6 shows the routing table of Shemp and the route entries resulting from the Update in Example 1-5.
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  • 39. Case Study: An EGP Stub Gateway Figure 1-10 shows an EGP stub gateway in AS 65502, connected to a core gateway in AS 65501. The IGP of the stub AS is RIP.
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  • 48. Figure 1-11. Core Router Stan Must Peer with Both Remote Neighbor Buster and Local Neighbor Ollie
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  • 52. Figure 1-12. Spanky and Buckwheat Must Peer Only with Stan, Whereas Alfalfa Must Peer Only with Ollie
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  • 56. Figure 1-13. EGP Indirect Neighbors
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  • 58. Example 1-18 shows the core gateway's indirect neighbors recorded as Third Party.
  • 59. Example 1-19 Routing Table Displays Next-Hop Routes to Indirect Neighbors
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  • 62. Example 1-21 192.168.20.1 Is Reachable as a Result of the Default Route
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