Transcript Enhanced IGRP Operation

Enhanced IGRP
Operation
What Is in a Neighbor Table?
p2r2
p2r2#show ip eigrp neighbors
IP-EIGRP neighbors for process 400
H Address
Interface Hold Uptime
(sec)
1 172.68.2.2
To0
13 02:15:30
0 172.68.16.2
Se1
10 02:38:29
SRTT
(ms)
8
29
RTO Q Seq
Cnt Num
200 0 9
200 0 6
Discovering Routes
A
1
Hello
B
I am router A, who is on the link?
Discovering Routes
B
A
1
Hello
I am router A, who is on the link?
Here is my routing information.
3
Update
2
Discovering Routes
B
A
1
Hello
I am router A, who is on the link?
Here is my routing information.
3
5
Ack
Thanks for the information!
Update
2
Discovering Routes
B
A
1
Hello
I am router A, who is on the link?
Here is my routing information.
4
Topology
Table
3
5
Ack
Thanks for the information!
Update
2
Discovering Routes
B
A
1
Hello
I am router A, who is on the link?
Here is my routing information.
4
Topology
Table
3
5
Ack
Update
Thanks for the information!
Update Here is my route information.
6
2
Discovering Routes
B
A
1
Hello
I am router A, who is on the link?
Here is my routing information.
4
Topology
Table
3
5
Ack
Update
Thanks for the information!
Update Here is my route information.
Thanks for the information!
Converged
Ack
6
2
Choosing Routes
IP
IP
A
AppleTalk
T1
B
19.2
T1
AppleTalk
IPX
IPX
T1
C
D
• EIGRP uses a composite metric to pick the
best path
Choosing Routes (cont.)
Network 7
(20)
H
FDDI
B
D
Destination
Topology
Table
7
7
7
G
(1)
(10)
A
(10)
(100)
E
C
(100)
(10)
F
Advert. Dist. Neighbor
30
21
220
H
B
D
Choosing Routes (cont.)
Network 7
(20)
H
FDDI
B
D
G
(1)
(10)
A
(10)
(100)
E
C
(100)
(10)
F
Destination Feasible. Dist. Advert. Dist. Neighbor
Topology
Table
7
7
7
40
31
230
30
21
220
H
B
D
Choosing Routes (cont.)
Network 7
(20)
H
FDDI
B
D
G
(1)
(10)
A
(10)
(100)
E
C
(100)
(10)
F
Destination Feasible. Dist. Advert. Dist. Neighbor
Topology
Table
7
7
7
40
31
230
30
21
220
H
B
D
B is current successor
H is the feasible successor
Router A’s
Routing Table
7
31
B
Maintaining Routes
Net 7
(20)
H
G
(1)
(10)
FDDI
B
C
(10)
A
Topology
Table
(10)
D
(100)
Destination Feasible Dist.
7
40
E
(100)
Advert. Dist.
30
F
Neighbor
State
H
A
1
Maintaining Routes
Net 7
(20)
H
G
(1)
(10)
FDDI
B
C
(10)
A
Topology
Table
(10)
D
(100)
Destination Feasible Dist.
40
7
2
Query
E
(100)
Advert. Dist.
F
Neighbor
State
H
A
30
Do you have feasible
successor to network 7?
Here is a
successor to
network 7.
Reply
1
Maintaining Routes (cont.)
A
3
Query
B
C
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?
I have no route
to network 7.
Reply
Maintaining Routes (cont.)
A
3
Query
B
C
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?
I have no route
to network 7.
Reply
Topology Table
4
Destination Advert. Distance Feasible Dist. Neighbor
State