Welcome to the final part in a 3 part series of articles about routers and routing .
Each gateway will need to keep track of which way to deliver various packages of data, and for this it uses a Routing Table.
A routing table is a database which keeps track of paths, like a map, and allows the gateway to provide this information to the node requesting the information.
I am now going to talk about IP routing and how you can manipulate routes to “direct” traffic.
When packets take a certain route to their destination they DO NOT have to take the same route back.
Although the IP Routing: EIGRP manual is missing for 12.4T and 15.1M/T the IOS 12.4 documentation has the command reference.
[sourcecode wraplines=”false” gutter=”false” autolinks=”false”] show ip eigrp [vrf ] [autonomous-system-number] topology [ip-address [mask | [name] [active | all-links | detail-links | pending | summary | zero-successors] [/sourcecode] and the “all-links” [sourcecode wraplines=”false” gutter=”false” autolinks=”false”] all-links – (Optional) Displays all topology entries and all links (paths) instead of displaying only feasible paths.Once upon a time the command was “show ip eigrp topology” to show EIGRP topology, now it’s “show ip eigrp topology all” and the old command show only Feasible Successors.Check this output: [sourcecode wraplines=”false” gutter=”false” autolinks=”false”] R4#sh ip eigrp 100 topology EIGRP-IPv4 Topology Table for AS(100)/ID(1.4) Codes: P – Passive, A – Active, U – Update, Q – Query, R – Reply, r – reply Status, s – sia Status P 1.0/24, 1 successors, FD is 281600 via Connected, Ethernet0/1 P 1.0/24, 1 successors, FD is 307200 via 1.1 (307200/281600), Ethernet0/1 P 1.0/24, 1 successors, FD is 281600 via Connected, Ethernet0/0 P 1.0/24, 1 successors, FD is 307200 via 1.3 (307200/281600), Ethernet0/0 R4# [/sourcecode] And compare with: [sourcecode wraplines=”false” gutter=”false” autolinks=”false”] R4#sh ip eigrp 100 topology all-links EIGRP-IPv4 Topology Table for AS(100)/ID(1.4) Codes: P – Passive, A – Active, U – Update, Q – Query, R – Reply, r – reply Status, s – sia Status P 1.0/24, 1 successors, FD is 281600, serno 1 via Connected, Ethernet0/1 P 1.0/24, 1 successors, FD is 307200, serno 7 via 1.1 (307200/281600), Ethernet0/1 via 1.3 (332800/307200), Ethernet0/0 P 1.0/24, 1 successors, FD is 281600, serno 2 via Connected, Ethernet0/0 P 1.0/24, 1 successors, FD is 307200, serno 9 via 1.3 (307200/281600), Ethernet0/0 via 1.1 (332800/307200), Ethernet0/1 R4# [/sourcecode] A quick scratch around confirms that this is true.The solution to this problem is to change access-list 1 to permit 192.168.3.16 instead of 192.168.3.160.Changing the access list to permit 192.168.3.16 fixes the problem.The construction of routing tables is the primary goal of routing protocols.
||[sourcecode wraplines=”false” gutter=”false” autolinks=”false”] show ip eigrp [vrf ] [autonomous-system-number] topology [ip-address [mask]] | [name] [active | all-links | detail-links | pending | summary | zero-successors] [/sourcecode] and the “all-links” [sourcecode wraplines=”false” gutter=”false” autolinks=”false”] all-links – (Optional) Displays all topology entries and all links (paths) instead of displaying only feasible paths.
Once upon a time the command was “show ip eigrp topology” to show EIGRP topology, now it’s “show ip eigrp topology all” and the old command show only Feasible Successors.
Check this output: [sourcecode wraplines=”false” gutter=”false” autolinks=”false”] R4#sh ip eigrp 100 topology EIGRP-IPv4 Topology Table for AS(100)/ID(1.4) Codes: P – Passive, A – Active, U – Update, Q – Query, R – Reply, r – reply Status, s – sia Status P 1.0/24, 1 successors, FD is 281600 via Connected, Ethernet0/1 P 1.0/24, 1 successors, FD is 307200 via 1.1 (307200/281600), Ethernet0/1 P 1.0/24, 1 successors, FD is 281600 via Connected, Ethernet0/0 P 1.0/24, 1 successors, FD is 307200 via 1.3 (307200/281600), Ethernet0/0 R4# [/sourcecode] And compare with: [sourcecode wraplines=”false” gutter=”false” autolinks=”false”] R4#sh ip eigrp 100 topology all-links EIGRP-IPv4 Topology Table for AS(100)/ID(1.4) Codes: P – Passive, A – Active, U – Update, Q – Query, R – Reply, r – reply Status, s – sia Status P 1.0/24, 1 successors, FD is 281600, serno 1 via Connected, Ethernet0/1 P 1.0/24, 1 successors, FD is 307200, serno 7 via 1.1 (307200/281600), Ethernet0/1 via 1.3 (332800/307200), Ethernet0/0 P 1.0/24, 1 successors, FD is 281600, serno 2 via Connected, Ethernet0/0 P 1.0/24, 1 successors, FD is 307200, serno 9 via 1.3 (307200/281600), Ethernet0/0 via 1.1 (332800/307200), Ethernet0/1 R4# [/sourcecode] A quick scratch around confirms that this is true.
The solution to this problem is to change access-list 1 to permit 192.168.3.16 instead of 192.168.3.160.
Changing the access list to permit 192.168.3.16 fixes the problem.
The construction of routing tables is the primary goal of routing protocols.
||[sourcecode wraplines=”false” gutter=”false” autolinks=”false”] show ip eigrp [vrf ] [autonomous-system-number] topology [ip-address [mask]] | [name] [active | all-links | detail-links | pending | summary | zero-successors] [/sourcecode] and the “all-links” [sourcecode wraplines=”false” gutter=”false” autolinks=”false”] all-links – (Optional) Displays all topology entries and all links (paths) instead of displaying only feasible paths.
Once upon a time the command was “show ip eigrp topology” to show EIGRP topology, now it’s “show ip eigrp topology all” and the old command show only Feasible Successors.
Check this output: [sourcecode wraplines=”false” gutter=”false” autolinks=”false”] R4#sh ip eigrp 100 topology EIGRP-IPv4 Topology Table for AS(100)/ID(1.4) Codes: P – Passive, A – Active, U – Update, Q – Query, R – Reply, r – reply Status, s – sia Status P 1.0/24, 1 successors, FD is 281600 via Connected, Ethernet0/1 P 1.0/24, 1 successors, FD is 307200 via 1.1 (307200/281600), Ethernet0/1 P 1.0/24, 1 successors, FD is 281600 via Connected, Ethernet0/0 P 1.0/24, 1 successors, FD is 307200 via 1.3 (307200/281600), Ethernet0/0 R4# [/sourcecode] And compare with: [sourcecode wraplines=”false” gutter=”false” autolinks=”false”] R4#sh ip eigrp 100 topology all-links EIGRP-IPv4 Topology Table for AS(100)/ID(1.4) Codes: P – Passive, A – Active, U – Update, Q – Query, R – Reply, r – reply Status, s – sia Status P 1.0/24, 1 successors, FD is 281600, serno 1 via Connected, Ethernet0/1 P 1.0/24, 1 successors, FD is 307200, serno 7 via 1.1 (307200/281600), Ethernet0/1 via 1.3 (332800/307200), Ethernet0/0 P 1.0/24, 1 successors, FD is 281600, serno 2 via Connected, Ethernet0/0 P 1.0/24, 1 successors, FD is 307200, serno 9 via 1.3 (307200/281600), Ethernet0/0 via 1.1 (332800/307200), Ethernet0/1 R4# [/sourcecode] A quick scratch around confirms that this is true.
The solution to this problem is to change access-list 1 to permit 192.168.3.16 instead of 192.168.3.160.
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