EIGRP unique load balancing

• Feature chi co trong gia thuc dinh tuyen IGRP va BGP (DMZ bandwidth)

• Share tai khong can bang giua cac link

• Mo hinh test  nhu sau:

• Adver mangj 8.8.8.0/24 tren R4 vao mang

• Chinh "  metric weights 0 0 0 1 0 0 " => k3 = 1--> metric = 256* tong delay /10

R1#show ip ei to 8.8.8.0/24

IP-EIGRP (AS 1): Topology entry for 8.8.8.0/24

  State is Passive, Query origin flag is 1, 1 Successor(s), FD is 76800

  Routing Descriptor Blocks:

  10.1.13.3 (FastEthernet0/1), from 10.1.13.3, Send flag is 0x0

      Composite metric is (89601/51200), Route is Internal

      Vector metric:

        Minimum bandwidth is 10000 Kbit

        Total delay is 3500 microseconds

        Reliability is 255/255

        Load is 1/255

        Minimum MTU is 1500

        Hop count is 2

  10.1.12.2 (FastEthernet0/0), from 10.1.12.2, Send flag is 0x0

      Composite metric is (115200/89600), Route is Internal

      Vector metric:

        Minimum bandwidth is 10000 Kbit

        Total delay is 4500 microseconds

        Reliability is 255/255

        Load is 1/255

        Minimum MTU is 1500

        Hop count is 2

Cac thong so nhu sau:

Path 1:  R1-R2-R4:    FD = 115200; AD = 89600

Path 2:  R1-R3-R4:    FD = 89601;   AD = 51200

Path 2 co gia tri FD nho hon => Path 2 la successor

Path 1 co gia tri AD < FD path 2 => Path 1 la PS

De dua path 1 len bang dinh tuyen thi ta cau hinh gia tri varian sao cho:

AD*variance > FD (path 1)

Hay 89600*variance > 89601

Chon variace = 2

R1#show ip route 8.8.8.0

Routing entry for 8.8.8.0/24

  Known via "eigrp 1", distance 90, metric 89601, type internal

  Redistributing via eigrp 1

  Last update from 10.1.12.2 on FastEthernet0/0, 00:00:54 ago

  Routing Descriptor Blocks:

  * 10.1.13.3, from 10.1.13.3, 00:00:54 ago, via FastEthernet0/1

      Route metric is 89601, traffic share count is 240

      Total delay is 3500 microseconds, minimum bandwidth is 10000 Kbit

      Reliability 255/255, minimum MTU 1500 bytes

      Loading 1/255, Hops 2

    10.1.12.2, from 10.1.12.2, 00:00:54 ago, via FastEthernet0/0

      Route metric is 115200, traffic share count is 187

      Total delay is 4500 microseconds, minimum bandwidth is 10000 Kbit

      Reliability 255/255, minimum MTU 1500 bytes

      Loading 1/255, Hops 2

• Ti le share count = 240/187

• Co the su dung offsetlist hoac distribute list + route-map de chinh gia tri metric thay doi ti le share count

EX: ti le share count = 1.5

      -> (115200 + x) / 89601 =  1.5

      -> x = 19201

Ta nen tang gia tri LD  metric cua path 1, neu tang gia tri AD path 1 thi co the xay ra truong hop AD > FD (path 2) luc do path 2 khong con la FS.

Cau hinh R1:

R1#show run | se router eigrp 1

router eigrp 1

 variance 2

 offset-list 0 in 19201 FastEthernet0/0

 offset-list 0 in 12801 FastEthernet0/1

 network 0.0.0.0

 metric weights 0 0 0 1 0 0

 no auto-summary

R1#show ip route 8.8.8.0

Routing entry for 8.8.8.0/24

  Known via "eigrp 1", distance 90, metric 89601, type internal

  Redistributing via eigrp 1

  Last update from 10.1.12.2 on FastEthernet0/0, 00:00:06 ago

  Routing Descriptor Blocks:

  * 10.1.13.3, from 10.1.13.3, 00:00:06 ago, via FastEthernet0/1

      Route metric is 89601, traffic share count is 3

      Total delay is 3500 microseconds, minimum bandwidth is 10000 Kbit

      Reliability 255/255, minimum MTU 1500 bytes

      Loading 1/255, Hops 2

    10.1.12.2, from 10.1.12.2, 00:00:06 ago, via FastEthernet0/0

      Route metric is 134401, traffic share count is 2

      Total delay is 5250 microseconds, minimum bandwidth is 10000 Kbit

      Reliability 255/255, minimum MTU 1500 bytes

      Loading 1/255, Hops 2

• Share count = 3/2

• Luy y: co the su dung distribute-list + route-map de modify gia tri mectric (chi co trong EIGRP)