Le calcul du metric EIGRP est le résultat composite de 5 paramétrés :
- La bande passante
- La Charge
- Le Délais
- La Fiabilité
Par défaut, K1 et K3 sont à 1, et le reste à zéro, réduisant la formule à :
R1#show ip protocols Routing Protocol is "eigrp 100" Outgoing update filter list for all interfaces is not set Incoming update filter list for all interfaces is not set Default networks flagged in outgoing updates Default networks accepted from incoming updates EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0 EIGRP maximum hopcount 100 EIGRP maximum metric variance 1 Redistributing: eigrp 100, eigrp 300 EIGRP NSF-aware route hold timer is 240s Automatic network summarization is not in effect Maximum path: 4 Routing for Networks: 1.1.1.1/32 10.1.111.1/32 Routing Information Sources: Gateway Distance Last Update 10.1.111.111 90 00:42:05 Distance: internal 90 external 170
Exemple :
Pour atteindre l`IP 111.1.1.111 depuis R1, il nécessaire de traverser l`interface fa0/0 de R1 et l`interface Lo0 de BB1
R1#show int fa0/0 | inc MTU MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
BB1#show interfaces lo0 | inc MTU MTU 1514 bytes, BW 8000000 Kbit, DLY 5000 usec,
- la plus petite bande passante est utilisée (celle de fa0/0)
- les delay sont additionnés
METRIC = 256 * (10000000 / 100000) + ( (5000 + 100) / 10 )
METRIC = 156160
R1#show ip route 111.1.1.0 Routing entry for 111.1.1.0/24 Known via "eigrp 100", distance 90, metric 156160, type internal Redistributing via eigrp 100, eigrp 300 Advertised by eigrp 300 Last update from 10.1.111.111 on FastEthernet0/0, 00:31:18 ago Routing Descriptor Blocks: * 10.1.111.111, from 10.1.111.111, 00:31:18 ago, via FastEthernet0/0 Route metric is 156160, traffic share count is 1 Total delay is 5100 microseconds, minimum bandwidth is 100000 Kbit Reliability 255/255, minimum MTU 1500 bytes Loading 1/255, Hops 1
Pour ne plus prendre en considération le délai, il suffit de mettre K3 a 0 :
R1(config)#router eigrp 100 R1(config-router)#metric weights 0 1 0 0 0 0 *Feb 19 21:02:49.767: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 10.1.111.111 (FastEt hernet0/0) is down: metric changed *Feb 19 21:02:50.351: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 100: Neighbor 10.1.111.111 (FastEt hernet0/0) is down: K-value mismatch
Vérifications :
R1#show ip protocols
Routing Protocol is "eigrp 100"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
EIGRP metric weight K1=1, K2=0, K3=0, K4=0, K5=0
EIGRP maximum hopcount 100
EIGRP maximum metric variance 1
Redistributing: eigrp 100, eigrp 300
EIGRP NSF-aware route hold timer is 240s
Automatic network summarization is not in effect
Maximum path: 4
Routing for Networks:
1.1.1.1/32
10.1.111.1/32
Routing Information Sources:
Gateway Distance Last Update
10.1.111.111 90 00:00:11
Distance: internal 90 external 170
R1#show ip route eigrp 100
111.0.0.0/24 is subnetted, 3 subnets
D 111.2.2.0 [90/25600] via 10.1.111.111, 00:02:17, FastEthernet0/0
D 111.1.1.0 [90/25600] via 10.1.111.111, 00:02:17, FastEthernet0/0
D 111.0.0.0 [90/25600] via 10.1.111.111, 00:02:17, FastEthernet0/0