2. Basic configuration of EIGRP configuration experiment
1. Experimental topology diagram
2. EIGRP workflow
Router A sends out the hello packet, and router B receives the hello packet from router An and adds it to the neighbor table.
Router B sends out the hello packet, and router A receives the hello packet from router B and adds it to the neighbor table.
Router B then sends its complete routing table information back to router A, which, when received, adds it to the topology table and responds to the ACK message.
Router A then sends its complete routing table information back to router B. after receiving it, router B adds it to the topology table and responds to the ACK message.
Most routers An and B add the optimal router entries to the routing table.
3. EIGRP encapsulation
4. Three tables
In the neighbor table, SRTT indicates the interval between the reliable message being sent and the ACK received, and RTO indicates the retransmission timeout. If the ACK is not received after the update is sent, the update is sent after the RTO. By default, the neighbor relationship is retransmitted 16 times, and the neighbor relationship is reset if the ACK is not received after 16 retransmissions.
Hold on = 3 * hello (Hellodefaults to 5s)
The hello interval can be modified using the command ip hello-interval eigrp 9010 in interface mode.
5. Metric calculation
Bandwidth K1 load K2 delay K3 Reliability K4 MTU K5
Metric = 256x (10 ^ 7 / minimum bandwidth + total delay / 10)
The bandwidth unit is kbps, the delay unit is usec, and the Metricvalue is the Metricvalue in the inflow direction of the route.
FD: the Metricvalue from the local to the target network
AD: advertised distance, the Metricvalue of the next hop to the destination network
6. Configuration
R3
Int s0/0
Ip add 13.1.1.3 255.255.255.0
No shut
Int lo0
Ip add 3.3.3.3 255.255.255.0
No shut
Router eigrp 90
Network 3.3.3.0 0.0.0.255
Network 13.1.1.0 0.0.0.255
No auto-summary
R1
Int s0/0
Ip add 13.1.1.1 255.255.255.0
No shut
Int s0/1
Ip add 12.1.1.1 255.255.255.0
No shut
Int lo0
Ip add 1.1.1.1 255.255.255.0
No shut
Router eigrp 90
Network 1.1.1.0 0.0.0.255
Network 12.1.1.0 0.0.0.255
Network 13.1.1.0 0.0.0.255
No auto-summary
R2
Int s0/1
Ip add 12.1.1.2 255.255.255.0
No shut
Int lo0
Ip add 2.2.2.2 255.255.255.0
No shut
Router eigrp 90
Network 2.2.2.0 0.0.0.255
Network 12.1.1.0 0.0.0.255
No auto-summary
