Lab 16. EIGRP – Unequal Load Balancing

Pada link yang unequal, maka load balancing tidak aktif dan hanya akan menggunakan satu link. Masih memakai topologi sebelumnya. Sebelumnya ubah bandwidth interface fa0/0 menjadi 1000Kbit agar tidak equal dengan fa0/1.

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

R1(config-if)#exit

Cek pada routing tabelnya dan didapati hanya satu jalur yang dilewati yakni melalui R3.

R1:

R1#sh ip route eigrp

34.0.0.0/24 is subnetted, 1 subnets

D 34.34.34.0 [90/30720] via 13.13.13.3, 00:01:42, FastEthernet0/1

2.0.0.0/32 is subnetted, 1 subnets

D 2.2.2.2 [90/161280] via 13.13.13.3, 00:01:42, FastEthernet0/1

3.0.0.0/32 is subnetted, 1 subnets

D 3.3.3.3 [90/156160] via 13.13.13.3, 00:13:30, FastEthernet0/1

4.0.0.0/32 is subnetted, 1 subnets

D 4.4.4.4 [90/158720] via 13.13.13.3, 00:01:42, FastEthernet0/1

24.0.0.0/24 is subnetted, 1 subnets

D 24.24.24.0 [90/33280] via 13.13.13.3, 00:01:42, FastEthernet0/1

Berikutnya kita cek dulu di eigrp topologinya yang masih menyimpan tentang jalur lain yang kita rubah bandwidthnya menjadi lebih kecil.

R1:

R1#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:

13.13.13.3 (FastEthernet0/1), from 13.13.13.3, 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

Perhatikan nilai metric nya, untuk mencari nilai varience yang akan kita masukkan, maka 2693120 dibagi 158720 = 16,9 maka nilai varience yang diset adalah 17 (pembulatan harus keatas untuk nilai berapapun).

R1:

R1(config)#router eigrp 1

R1(config-router)#variance 17

Hasil akhirnya.

R1#sh ip route eigrp

34.0.0.0/24 is subnetted, 1 subnets

D 34.34.34.0 [90/30720] via 13.13.13.3, 00:00:55, FastEthernet0/1

2.0.0.0/32 is subnetted, 1 subnets

D 2.2.2.2 [90/161280] via 13.13.13.3, 00:00:55, FastEthernet0/1

[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 13.13.13.3, 00:00:55, FastEthernet0/1

4.0.0.0/32 is subnetted, 1 subnets

D 4.4.4.4 [90/158720] via 13.13.13.3, 00:00:55, FastEthernet0/1

[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 13.13.13.3, 00:00:55, FastEthernet0/1

R1:

R1#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:

* 13.13.13.3, from 13.13.13.3, 00:02:10 ago, via FastEthernet0/1

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

Seperti yang terlihat sekarang 2 jalur digunakan secara bersamaan, namun dengan pembagian setiap 7 paket dkirimkan melalui link utama, maka berikutnya 1 paket dkirimkan ke link kedua.