EIGRP Un-Equal load balance

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EIGRP Un-Equal load balance

Routing protocol EIGRP dapat melakukan load balance jika terdapat dua atau lebih jalur yang masing-masing nilai metricnya sama, tetapi terkadang muncul suatu keadaan dimana ada beberapa jalur yang tujuannya sama tetapi nilai metricnya berbeda, hal ini menyebabkan EIGRP hanya memilih satu jalur saja (redundant), tetapi sebenarnya kita dapat mengakalinya agar dapat load balance meski nilai metric pada masing-masing jalur berbeda.

Untuk melakukan Un-Equal load balance kita perlu mengkonfigurasi nilai variance, nilai ini didapatkan dari hasi bagi nilai FD masing-masing jalur. Berikut ini adalah topologinya :
Untuk mencapai R4 dari R1 terdapat dua jalur yaitu lewat e0/0 dan e0/1, kemudian nilai bandwidth pada e0/1 kita kecilkan agar nilai metric antara e0/0 dan e0/1 berbeda sehingga jalur di e0/0 akan dipilih menjadi jalur utama, kemudian kita konfigurasi variance agar dapat melakukan load balance meskipun nilai metricnya berbeda.

Pertama kita ubah nilai bandwitdh di interface e0/1 Router R1 agar nilai metricnya berubah dan tidak sama dengan e0/0 :
R1(config)#int e0/1
R1(config-if)#band 500
R1(config-if)#exi

IP Addressing

    R1

    R1(config)#int lo0
    R1(config-if)#ip add 1.1.1.1 255.255.255.255
    R1(config-if)#exi
    R1(config)#int e0/0
    R1(config-if)#ip add 12.12.12.1 255.255.255.0
    R1(config-if)#no sh
    R1(config-if)#exi
    R1(config)#int e0/1
    R1(config-if)#ip add 13.13.13.1 255.255.255.0
    R1(config-if)#no sh
    R1(config-if)#exi

    R2

    R2(config)#int lo0
    R2(config-if)#ip add 2.2.2.2 255.255.255.255
    R2(config-if)#exi
    R2(config)#int e0/0
    R2(config-if)#ip add 12.12.12.2 255.255.255.0
    R2(config-if)#no sh
    R2(config-if)#exi
    R2(config)#int e0/1
    R2(config-if)#ip add 24.24.24.2 255.255.255.0
    R2(config-if)#no sh
    R2(config-if)#exi

    R3

    R3(config)#int lo0
    R3(config-if)#ip add 3.3.3.3 255.255.255.255
    R3(config-if)#exi
    R3(config)#int e0/0
    R3(config-if)#ip add 13.13.13.3 255.255.255.0
    R3(config-if)#no sh
    R3(config-if)#exi
    R3(config)#int e0/1
    R3(config-if)#ip add 34.34.34.3 255.255.255.0
    R3(config-if)#no sh
    R3(config-if)#exi

    R4

    R4(config)#int lo0
    R4(config-if)#ip add 4.4.4.4 255.255.255.255
    R4(config-if)#ex
    R4(config)#int e0/0
    R4(config-if)#ip add 24.24.24.4 255.255.255.0
    R4(config-if)#no sh
    R4(config-if)#exi
    R4(config)#int e0/1
    R4(config-if)#ip add 34.34.34.4 255.255.255.0
    R4(config-if)#no sh
    R4(config-if)#exi

Routing EIGRP

    R1

    R1(config)#router eigrp 1
    R1(config-router)#no auto-summ
    R1(config-router)#net 1.1.1.1 0.0.0.0
    R1(config-router)#net 12.12.12.0 0.0.0.255
    R1(config-router)#net 13.13.13.0 0.0.0.255
    R1(config-router)#exi

    R2

    R2(config)#router eigrp 1
    R2(config-router)#no auto-summ
    R2(config-router)#net 2.2.2.2 0.0.0.0
    R2(config-router)#net 24.24.24.0 0.0.0.255
    R2(config-router)#net 12.12.12.0 0.0.0.255
    R2(config-router)#exi

    R3

    R3(config)#router eigrp 1
    R3(config-router)#no auto-summ
    R3(config-router)#net 3.3.3.3 0.0.0.0
    R3(config-router)#net 13.13.13.0 0.0.0.255
    R3(config-router)#net 34.34.34.0 0.0.0.255
    R3(config-router)#exi

    R4

    R4(config)#router eigrp 1
    R4(config-router)#no auto-summ
    R4(config-router)#net 4.4.4.4 0.0.0.0
    R4(config-router)#net 24.24.24.0 0.0.0.255
    R4(config-router)#net 34.34.34.0 0.0.0.255
    R4(config-router)#exi
Lalu kita lihat Routing table di R1
R1(config)#do sh ip ro
Codes: L - local, 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, H - NHRP, l - LISP
a - application route
+ - replicated route, % - next hop override

Gateway of last resort is not set

1.0.0.0/32 is subnetted, 1 subnets
C 1.1.1.1 is directly connected, Loopback0
2.0.0.0/32 is subnetted, 1 subnets
D 2.2.2.2 [90/409600] via 12.12.12.2, 03:01:27, Ethernet0/0
3.0.0.0/32 is subnetted, 1 subnets
D 3.3.3.3 [90/460800] via 12.12.12.2, 00:00:26, Ethernet0/0
4.0.0.0/32 is subnetted, 1 subnets
D 4.4.4.4 [90/435200] via 12.12.12.2, 00:00:26, Ethernet0/0

12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 12.12.12.0/24 is directly connected, Ethernet0/0
L 12.12.12.1/32 is directly connected, Ethernet0/0
13.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 13.13.13.0/24 is directly connected, Ethernet0/1
L 13.13.13.1/32 is directly connected, Ethernet0/1
24.0.0.0/24 is subnetted, 1 subnets
D 24.24.24.0 [90/307200] via 12.12.12.2, 00:00:26, Ethernet0/0
34.0.0.0/24 is subnetted, 1 subnets
D 34.34.34.0 [90/332800] via 12.12.12.2, 00:00:26, Ethernet0/0
Dan terlihat 4.4.4.4 hanya memiliki satu jalur, kemudian kita lihat nilai metric pada masing-masing jalur :
R1#sh ip eigrp topology 4.4.4.4/32
EIGRP-IPv4 Topology Entry for AS(1)/ID(1.1.1.1) for 4.4.4.4/32
State is Passive, Query origin flag is 1, 1 Successor(s), FD is 435200
Descriptor Blocks:
12.12.12.2 (Ethernet0/0), from 12.12.12.2, Send flag is 0x0
Composite metric is (435200/409600), route is Internal
Vector metric:
Minimum bandwidth is 10000 Kbit
Total delay is 7000 microseconds
Reliability is 255/255
Load is 1/255
Minimum MTU is 1500
Hop count is 2
Originating router is 4.4.4.4
13.13.13.3 (Ethernet0/1), from 13.13.13.3, Send flag is 0x0
Composite metric is (5299200/409600), route is Internal
Vector metric:
Minimum bandwidth is 500 Kbit
Total delay is 7000 microseconds
Reliability is 255/255
Load is 1/255
Minimum MTU is 1500
Hop count is 2
Kemudian kedua nilai yang ditebalkan itu kita bagi 5299200 dengan 435200 dan hasilnya 12,176470588 jika komanya berlebih berapapun nilainya bulatkan saja, maka nilai variancenya adalah 13.
R1(config)#router eigrp 1
R1(config-router)#variance 13
R1(config-router)#ex
Dan kita lihat hasilnya pada Routing table R1.
R1(config)#do sh ip ro
Codes: L - local, 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, H - NHRP, l - LISP
a - application route
+ - replicated route, % - next hop override

Gateway of last resort is not set

1.0.0.0/32 is subnetted, 1 subnets
C 1.1.1.1 is directly connected, Loopback0
2.0.0.0/32 is subnetted, 1 subnets
D 2.2.2.2 [90/409600] via 12.12.12.2, 00:00:30, Ethernet0/0
3.0.0.0/32 is subnetted, 1 subnets
D 3.3.3.3 [90/5273600] via 13.13.13.3, 00:00:30, Ethernet0/1
[90/460800] via 12.12.12.2, 00:00:30, Ethernet0/0
4.0.0.0/32 is subnetted, 1 subnets
D 4.4.4.4 [90/5299200] via 13.13.13.3, 00:00:30, Ethernet0/1
[90/435200] via 12.12.12.2, 00:00:30, Ethernet0/0

12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 12.12.12.0/24 is directly connected, Ethernet0/0
L 12.12.12.1/32 is directly connected, Ethernet0/0
13.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 13.13.13.0/24 is directly connected, Ethernet0/1
L 13.13.13.1/32 is directly connected, Ethernet0/1
24.0.0.0/24 is subnetted, 1 subnets
D 24.24.24.0 [90/307200] via 12.12.12.2, 00:00:30, Ethernet0/0
34.0.0.0/24 is subnetted, 1 subnets
D 34.34.34.0 [90/332800] via 12.12.12.2, 00:00:30, Ethernet0/0
Dan terlihat jalur sudah di load balance kembali, untuk membuktikannya kita lakukan traceroute.
R1#traceroute 4.4.4.4 so lo0
Type escape sequence to abort.
Tracing the route to 4.4.4.4
VRF info: (vrf in name/id, vrf out name/id)
1 12.12.12.2 0 msec 0 msec 1 msec
2 24.24.24.4 0 msec
34.34.34.4 0 msec
24.24.24.4 1 msec


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