enhanced igrp operation. what is in a neighbor table? p2r2 p2r2#show ip eigrp neighbors ip-eigrp...
TRANSCRIPT
Enhanced IGRP Operation
Enhanced IGRP Operation
What Is in a Neighbor Table?
p2r2
p2r2#show ip eigrp neighborsIP-EIGRP neighbors for process 400H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num1 172.68.2.2 To0 13 02:15:30 8 200 0 90 172.68.16.2 Se1 10 02:38:29 29 200 0 6
Discovering Routes
I am router A, who is on the link?Hello
A B
1
Discovering Routes
UpdateHere is my routing information.
I am router A, who is on the link?Hello
A B
1
2
3
Discovering Routes
UpdateHere is my routing information.
I am router A, who is on the link?Hello
A B
1
2
Thanks for the information!Ack3
5
Discovering Routes
UpdateHere is my routing information.
I am router A, who is on the link?Hello
A B
1
2
Thanks for the information!AckTopology Table
34
5
Discovering Routes
UpdateHere is my routing information.
I am router A, who is on the link?Hello
A B
1
2
Thanks for the information!Ack
Here is my route information.Update
Topology Table
34
5
6
Discovering Routes
UpdateHere is my routing information.
I am router A, who is on the link?Hello
A B
1
2
Thanks for the information!Ack
Here is my route information.Update
Topology Table
34
5
Converged
Thanks for the information! Ack 6
• EIGRP uses a composite metric to pick the best path
Choosing Routes
IPX
19.2
T1
T1 T1
IPX
AppleTalk
IP
AppleTalk
IP
A B
DC
Choosing Routes (cont.)
7
Destination Advert. Dist.
77
H
B
3021
220
Topology Table
Network 7
FDDI
(10)
(10)(20)
(100)(100)
(10)
C
E F
G(1)
Neighbor
D7
AD
B
H
Choosing Routes (cont.)
7
Destination Feasible. Dist. Advert. Dist.
77
H
B
40 3031 21
230 220
Topology Table
Network 7
FDDI
(10)
(10)(20)
(100)(100)
(10)
C
E F
G(1)
Neighbor
D7
AD
B
H
Choosing Routes (cont.)
B is current successor H is the feasible successor
7
Destination Feasible. Dist. Advert. Dist.
77
H
B
40 3031 21
230 220
Topology Table
Network 7
FDDI
(10)
(10)(20)
(100)(100)
(10)
C
E F
G(1)
Routing TableNeighbor
D
317
7
B
AD
B
H
Router A’s
Maintaining RoutesNet 7
FDDI(10)
(10)(20)
(100)(100)
(10)
C
E F
G(1)
Destination Feasible Dist. Advert. Dist.
7 H40 30Topology Table
Neighbor State
A
A
1
D
H
B
Maintaining Routes
Do you have feasible successor to network 7?Query
Here is a successor to network 7.
Reply
Net 7
FDDI(10)
(10)(20)
(100)(100)
(10)
C
E F
G(1)
Destination Feasible Dist. Advert. Dist.
7 H40 30Topology Table
Neighbor State
A
A
1
2
D
H
B
Maintaining Routes (cont.)
Do you have feasible successor to network 7?Query
I have no route to network 7. Reply
Do you have feasible successor to network 7?Query
I have no route to network 7. Reply
3
A B C
Maintaining Routes (cont.)
Do you have feasible successor to network 7?Query
I have no route to network 7.
Reply
Do you have feasible successor to network 7?Query
I have no route to network 7. Reply
3
Destination Advert. Distance Feasible Dist.
Topology Table
Neighbor State4
A B C