線路負載平衡 (Path Load Balancing) 觀察範例, 使用 Packet Tracer 5.2

網友問到線路負載平衡 (Path Load Balancing), 我想用 Packet Tracer 的例子來讓大家觀察, 比較容易理解.

• Packet Tracer 5.2, pt-path-load-balancing.pkt

我先使用 EIGRP 來示範. 其中, 10.1.1.0/24 從 Router10 的角度看, 就有三個等長路徑. 這就是IOS的線路負載平衡 (Path Load Balancing) 結果.

Router10>show ip route 
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
       i - IS-IS, 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

     10.0.0.0/24 is subnetted, 8 subnets
D       10.1.1.0 [90/2684416] via 10.3.1.2, 00:00:06, Serial0/0
                 [90/2684416] via 10.3.2.2, 00:00:05, Serial0/1
                 [90/2684416] via 10.3.3.2, 00:00:04, Serial0/2
D       10.2.1.0 [90/2681856] via 10.3.1.2, 00:00:07, Serial0/0
D       10.2.2.0 [90/2681856] via 10.3.2.2, 00:00:05, Serial0/1
D       10.2.3.0 [90/2681856] via 10.3.3.2, 00:00:04, Serial0/2
C       10.3.1.0 is directly connected, Serial0/0
C       10.3.2.0 is directly connected, Serial0/1
C       10.3.3.0 is directly connected, Serial0/2
C       10.10.1.0 is directly connected, FastEthernet0/0
Router10>

各位如果想觀察 OSPF 或是 RIP 的話, 請將 Router10 和 Router0 上面的其他路由資訊交換協定, 用 "no router X" 等命令關掉即可.