Day 2 - EIGRP - Mindah Jalur - Offset List

Dalam EIGRP, selain dengan melakukan manipulasi delay dan bandwidth, kita bisa juga melakukan manipulasi agar jalur bisa kita pindah dengan menggunakan Offset List.

Lab kali ini kita akan membahas bagaimana cara konfigurasi pemindahan jalur dengan menggunakan Offset List.

Lab 13 - EIGRP - Mindah Jalur - Offset List

Topologi yang digunakan adalah sbb :
 
Konfigurasi R1:

interface Loopback0
 ip address 1.1.1.1 255.255.255.255
!
interface FastEthernet0/0
 ip address 13.13.13.1 255.255.255.0
!
interface Serial0/0
 ip address 12.12.12.1 255.255.255.0
!

router eigrp 1
 network 1.1.1.1 0.0.0.0
 network 12.12.12.1 0.0.0.0
 network 13.13.13.1 0.0.0.0
 no auto-summary

Konfigurasi R2 :

interface Loopback0
 ip address 2.2.2.2 255.255.255.255
!
interface FastEthernet0/0
 ip address 23.23.23.2 255.255.255.0
!
interface Serial0/0
 ip address 12.12.12.2 255.255.255.0
!

router eigrp 1
 network 2.2.2.2 0.0.0.0
 network 12.12.12.2 0.0.0.0
 network 23.23.23.2 0.0.0.0
 no auto-summary

Konfigurasi R3 :

interface Loopback0
 ip address 3.3.3.3 255.255.255.255
!
interface FastEthernet0/0
 ip address 13.13.13.3 255.255.255.0
!
interface FastEthernet0/1
 ip address 23.23.23.3 255.255.255.0
!

router eigrp 1
 network 3.3.3.3 0.0.0.0
 network 13.13.13.3 0.0.0.0
 network 23.23.23.3 0.0.0.0
 no auto-summary

Kita coba cek kondisi awal routing di R1 terhadap IP 3.3.3.3/32 :
R1(config-router)#do sh ip route 3.3.3.3
Routing entry for 3.3.3.3/32
  Known via "eigrp 1", distance 90, metric 409600, type internal
  Redistributing via eigrp 1
  Last update from 13.13.13.3 on FastEthernet0/0, 00:07:11 ago
  Routing Descriptor Blocks:
  * 13.13.13.3, from 13.13.13.3, 00:07:11 ago, via FastEthernet0/0
      Route metric is 409600, traffic share count is 1
      Total delay is 6000 microseconds, minimum bandwidth is 10000 Kbit
      Reliability 255/255, minimum MTU 1500 bytes
      Loading 1/255, Hops 1

Terlihat bahwa untuk routing ke arah IP 3.3.3.3/32 langsung melalui Fa0/0.




Sekarang kita coba rubah jalurnya menggunakan nilai Offset List yang paling besar untuk interface Fa0/0 :

R1(config)#access-list 1 permit host 3.3.3.3
R1(config)#router eigrp 1
R1(config-router)#offset-list 1 in ?
  <0-2147483647>  Offset
R1(config-router)#offset-list 1 in 2147483647 fa0/0

*Mar  1 00:39:29.187: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 13.13.13.3 (FastEthernet0/0) is resync: route configuration changed


Kita cek lagi routing tablenya :
R1(config-router)#do sh ip route 3.3.3.3
Routing entry for 3.3.3.3/32
  Known via "eigrp 1", distance 90, metric 2323456, type internal
  Redistributing via eigrp 1
  Last update from 12.12.12.2 on Serial0/0, 00:03:36 ago
  Routing Descriptor Blocks:
  * 12.12.12.2, from 12.12.12.2, 00:03:36 ago, via Serial0/0
      Route metric is 2323456, traffic share count is 1
      Total delay is 26000 microseconds, minimum bandwidth is 1544 Kbit
      Reliability 255/255, minimum MTU 1500 bytes
      Loading 1/255, Hops 2


Kita lihat juga pada EIGRP topologi nya :
R1(config-router)#do sh ip eigrp topology 3.3.3.3 255.255.255.255
IP-EIGRP (AS 1): Topology entry for 3.3.3.3/32
  State is Passive, Query origin flag is 1, 1 Successor(s), FD is 2323456
  Routing Descriptor Blocks:
  12.12.12.2 (Serial0/0), from 12.12.12.2, Send flag is 0x0
      Composite metric is (2323456/409600), Route is Internal
      Vector metric:
        Minimum bandwidth is 1544 Kbit
        Total delay is 26000 microseconds
        Reliability is 255/255
        Load is 1/255
        Minimum MTU is 1500
        Hop count is 2
  13.13.13.3 (FastEthernet0/0), from 13.13.13.3, Send flag is 0x0
      Composite metric is (2147893247/128256), Route is Internal
      Vector metric:
        Minimum bandwidth is 10000 Kbit
        Total delay is 83892079 microseconds
        Reliability is 255/255
        Load is 1/255
        Minimum MTU is 1500
        Hop count is 1

Terlihat bahwa Offset List pada EIGRP akan mempengaruhi nilai delay.