EIGRP metric 计算

如下拓扑：



在R1上：
Router>enable
Router#config t
Router(config)#hostname R1
R1(config)#int s1/1
R1(config-if)#ip add 192.168.1.1 255.255.255.0
R1(config-if)#no shut
R1(config-if)#exit
R1(config)#router eigrp 100
R1(config-router)#network 192.168.1.0 0.0.0.255
R1(config-router)#end
R1#
在R2上：
Router>
Router>en
Router#config t
Router(config)#hostname R2
R2(config)#int s1/0
R2(config-if)#clock rate 56000
R2(config-if)#ip add 192.168.1.2 255.255.255.0
R2(config-if)#no shut
R2(config-if)#int lo1
R2(config-if)#ip add 192.168.2.1 255.255.255.0
R2(config-if)#no shut
R2(config-if)#exit
R2(config)#router eigrp 100
R2(config-router)#network 192.16
R2(config-router)#network 192.168.1.0 0.0.0.255
R2(config-router)#network 192.168.2.0 0.0.0.255
R2(config-router)#end
R2#
在R1上：
R1#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
C 192.168.1.0/24 is directly connected, Serial1/1
D 192.168.2.0/24 [90/2297856] via 192.168.1.2, 00:00:08, Serial1/1
Metric: 2297856
带宽+延迟=最小带宽+总和延迟=[10的7次方/1544+（20000+5000）/10]*256=(6476+2500)*256=
R1#show int s1/1
Serial1/1 is up, line protocol is up
Hardware is M4T
Internet address is 192.168.1.1/24
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, crc 16, loopback not set
Keepalive set (10 sec)
Restart-Delay is 0 secs
Last input 00:00:01, output 00:00:01, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/1/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 1158 kilobits/sec
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
14 packets input, 1549 bytes, 0 no buffer
Received 5 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
19 packets output, 1741 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 output buffer failures, 0 output buffers swapped out
2 carrier transitions DCD=up DSR=up DTR=up RTS=up CTS=up
R1#






下面修改R1的S1/1的接口带宽：
R1(config)#int s1/1
R1(config-if)#bandwitch
R1(config-if)#bandwidth 300
R1(config-if)#
开始计算：



取值：33333
（33333+2500）*256=



查看R1的路由表：
R1#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
C 192.168.1.0/24 is directly connected, Serial1/1
D 192.168.2.0/24 [90/9173248] via 192.168.1.2, 00:00:07, Serial1/1
试验完成。