Lab 16. Eigrp – Unequal Load Balancing

Perbedaan dari lab sebelumnya adalah Unequal ini tetap menggunakan 2 jalur secara bersamaan, tapi salah satu jalurnya akan di bebankan lebih banyak daripada jalur yang satunya.

Ubah bandwidth f0/0 menjadi 1000 kbit agar tidak equal (seimbang) dengan f1/0.

*R1

  •  R1(config)#int f0/0
  •  R1(config-if)#bandwidth 1000

Coba cek table routing agar memastikan satu jalur saja yang dilewati yaitu melalui R3.

*R1

  •  R1 (config)#do sh ip route eigrp

  34.0.0.0/24 is subnetted, 1 subnets

 D 34.34.34.0 [90/30720] via 13.13.13.2, 00:01:42, FastEthernet1/0

  2.0.0.0/32 is subnetted, 1 subnets

 D 2.2.2.2 [90/161280] via 13.13.13.2, 00:01:42, FastEthernet1/0

  3.0.0.0/32 is subnetted, 1 subnets

 D 3.3.3.3 [90/156160] via 13.13.13.2, 00:13:30, FastEthernet1/0

  4.0.0.0/32 is subnetted, 1 subnets

 D 4.4.4.4 [90/158720] via 13.13.13.2, 00:01:42, FastEthernet1/0

  24.0.0.0/24 is subnetted, 1 subnets  

D 24.24.24.0 [90/33280] via 13.13.13.2, 00:01:42, FastEthernet1/0

Kita juga masih harus cek eigrp topologinya yang mana masih menyimpan informasi tentang jalur yang kita rubah bandwidth-nya menjadi lebih kecil.

*R1

  •  R1 (config)#do sh ip eigrp topology 4.4.4.4/32

 IP-EIGRP (AS 1): Topology entry for 4.4.4.4/32

  State is Passive, Query origin flag is 1, 1 Successor(s), FD is 158720

  Routing Descriptor Blocks:

  13.13.13.2 (FastEthernet1/0), from 13.13.13.2, Send flag is 0x0

  Composite metric is (158720/156160), Route is Internal

  Vector metric:

  Minimum bandwidth is 100000 Kbit

  Total delay is 5200 microseconds

  Reliability is 255/255

  Load is 1/255

  Minimum MTU is 1500

  Hop count is 2

  12.12.12.2 (FastEthernet0/0), from 12.12.12.2, Send flag is 0x0

  Composite metric is (2693120/156160), Route is Internal

  Vector metric:

  Minimum bandwidth is 1000 Kbit

  Total delay is 5200 microseconds

  Reliability is 255/255

  Load is 1/255

  Minimum MTU is 1500   

Hop count is 2

Untuk mencari varience, maka perhatikan nilai metric-nya. Berarti 2693120 dibagi 158720 = 16,9 (pembulatan harus keatas untuk nilai berapapun), maka kita bulatkan varience-nya menjadi 17.

*R1

  •  R1(config)#router eigrp 1  
  • R1(config-router)#variance 17

*R1

  •  R1 (config)#do sh ip route eigrp

  34.0.0.0/24 is subnetted, 1 subnets

 D 34.34.34.0 [90/30720] via 13.13.13.2, 00:00:55, FastEthernet1/0

  2.0.0.0/32 is subnetted, 1 subnets

 D 2.2.2.2 [90/161280] via 13.13.13.2, 00:00:55, FastEthernet1/0

  [90/2690560] via 12.12.12.2, 00:00:55, FastEthernet0/0

  3.0.0.0/32 is subnetted, 1 subnets

 D 3.3.3.3 [90/156160] via 13.13.13.2, 00:00:55, FastEthernet1/0

  4.0.0.0/32 is subnetted, 1 subnets

 D 4.4.4.4 [90/158720] via 13.13.13.2, 00:00:55, FastEthernet1/0

  [90/2693120] via 12.12.12.2, 00:00:55, FastEthernet0/0

  24.0.0.0/24 is subnetted, 1 subnets

 D 24.24.24.0 [90/33280] via 13.13.13.2, 00:00:55, FastEthernet1/0

*R1

  •  R1 (config)#do sh ip route 4.4.4.4

 Routing entry for 4.4.4.4/32

  Known via “eigrp 1”, distance 90, metric 158720, type internal

  Redistributing via eigrp 1

  Last update from 12.12.12.2 on FastEthernet0/0, 00:02:10 ago

  Routing Descriptor Blocks:

  * 13.13.13.2, from 13.13.13.2, 00:02:10 ago, via FastEthernet1/0

  Route metric is 158720, traffic share count is 120

  Total delay is 5200 microseconds, minimum bandwidth is 100000 Kbit

  Reliability 255/255, minimum MTU 1500 bytes

  Loading 1/255, Hops 2

  12.12.12.2, from 12.12.12.2, 00:02:10 ago, via FastEthernet0/0

  Route metric is 2693120, traffic share count is 7

  Total delay is 5200 microseconds, minimum bandwidth is 1000 Kbit

  Reliability 255/255, minimum MTU 1500 bytes

  Loading 1/255, Hops 2

Bisa dilihat bahwa 2 jalur tetap di pakai secara bersamaan, tetapi beban salah satu jalur lebih berat daripada jalur yang lainnya.

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