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Judul : EIGRP Un-Equal load balance
link : EIGRP Un-Equal load balance

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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