Objective

• Frame Relay juga memiliki kemampuan multilink yakni membundle beberapa link serial menjadi satu
• Kita juga bisa menambahkan authentikasi pada interface multilink frame-relay tersebut

Metode Lab

• Sambungkan dua link serial pada setiap router
• Konfigurasikan Multilink
• Konfigurasikan Authentifikasi

Verifikasi Lab
Pastikan ketika pada RM-R1 link local S0/0 ke Frame Relay Switch down, link akan berpindah ke backupnya

Kita bisa juga menerapkan authentifikasi pada frame relay, yakni dengan mengkonfigurasikan PPP over Frame Relay, selain itu kita juga bisa membundle beberapa linknya dengan PPP multilink.

Router Frame-Relay
FRSW(config)#frame-relay switching
FRSW(config)#int s0/0
FRSW(config-if)#no shut
FRSW(config-if)#encapsulation frame-relay
FRSW(config-if)#clock rate 128000
FRSW(config-if)#frame-relay lmi-type cisco
FRSW(config-if)#frame-relay intf-type dce
FRSW(config-if)#frame-relay route 103 interface se0/2 301
FRSW(config-if)#int s0/1
FRSW(config-if)#no shut
FRSW(config-if)#encapsulation frame-relay
FRSW(config-if)#clock rate 128000
FRSW(config-if)#frame-relay lmi-type cisco
FRSW(config-if)#frame-relay intf-type dce
FRSW(config-if)#frame-relay route 204 interface se0/3 402
FRSW(config-if)#int s0/2
FRSW(config-if)#no shut
FRSW(config-if)#encapsulation frame-relay
FRSW(config-if)#clock rate 128000
FRSW(config-if)#frame-relay lmi-type cisco
FRSW(config-if)#frame-relay intf-type dce
FRSW(config-if)#frame-relay route 301 interface se0/0 103
FRSW(config-if)#int s0/3
FRSW(config-if)#no shut
FRSW(config-if)#encapsulation frame-relay
FRSW(config-if)#clock rate 128000
FRSW(config-if)#frame-relay lmi-type cisco
FRSW(config-if)#frame-relay intf-type dce
FRSW(config-if)#frame-relay route 402 interface se0/1 204

Router RM-R1
RM-R1(config)#int s0/0
RM-R1(config-if)#no shut
RM-R1(config-if)#encapsulation frame-relay
RM-R1(config-if)#frame-relay interface-dlci 103 ppp Virtual-Template1
RM-R1(config-fr-dlci)#int se0/1
RM-R1(config-if)#no shut
RM-R1(config-if)#encapsulation frame-relay
RM-R1(config-if)#frame-relay interface-dlci 204 ppp Virtual-Template1
RM-R1(config-fr-dlci)#interface Virtual-Template1
RM-R1(config-if)#ip addr 12.12.12.1 255.255.255.0  
RM-R1(config-if)#ppp multilink
RM-R1(config-if)#ppp authentication chap
RM-R1(config-if)#exit       
RM-R1(config)#username RM-R2 password cisco

Router RM-R2
RM-R2(config)#int s0/0
RM-R2(config-if)#no shut
RM-R2(config-if)#encapsulation frame-relay
RM-R2(config-if)#frame-relay interface-dlci 301 ppp Virtual-Template1
RM-R2(config-fr-dlci)#int se0/1
RM-R2(config-if)#no shut
RM-R2(config-if)#encapsulation frame-relay
RM-R2(config-if)#frame-relay interface-dlci 402 ppp Virtual-Template1
RM-R2(config-fr-dlci)#interface Virtual-Template1
RM-R2(config-if)#ip addr 12.12.12.2 255.255.255.0
RM-R2(config-if)#ppp multilink
RM-R2(config-if)#ppp authentication chap
RM-R2(config-if)#exit
RM-R2(config)#username RM-R1 password cisco

Verifikasi
RM-R1(config)#do sh ppp multilink
Virtual-Access4, bundle name is RM-R2
  Username is RM-R2
  Endpoint discriminator is RM-R2
  Bundle up for 00:01:27, total bandwidth 200000, load 1/255
  Receive buffer limit 24384 bytes, frag timeout 1000 ms
    0/0 fragments/bytes in reassembly list
    0 lost fragments, 0 reordered
    0/0 discarded fragments/bytes, 0 lost received
    0x0 received sequence, 0x0 sent sequence
  Member links: 2 (max not set, min not set)
    Vi1, since 00:01:28
    Vi3, since 00:01:25
No inactive multilink interfaces
RM-R1(config)#RM-R2(config)#do sh ppp multilink

Virtual-Access4, bundle name is RM-R1
  Username is RM-R1
  Endpoint discriminator is RM-R1
  Bundle up for 00:01:55, total bandwidth 200000, load 1/255
  Receive buffer limit 24384 bytes, frag timeout 1000 ms
    0/0 fragments/bytes in reassembly list
    0 lost fragments, 0 reordered
    0/0 discarded fragments/bytes, 0 lost received
    0x0 received sequence, 0x0 sent sequence
  Member links: 2 (max not set, min not set)
    Vi1, since 00:01:56
    Vi3, since 00:01:53
No inactive multilink interfaces
RM-R2(config)#

RM-R2(config)#do sh ip int br
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            unassigned      YES unset  administratively down down    
Serial0/0                  unassigned      YES unset  up                    up      
FastEthernet0/1            unassigned      YES unset  administratively down down    
Serial0/1                  unassigned      YES unset  up                    up      
Virtual-Access1            12.12.12.2      YES TFTP   up                    up      
Virtual-Template1          12.12.12.2      YES manual down                  down    
Virtual-Access2            unassigned      YES unset  down                  down    
Virtual-Access3            12.12.12.2      YES TFTP   up                    up      
Virtual-Access4            12.12.12.2      YES TFTP   up                    up      

RM-R2(config)#do ping 12.12.12.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 12.12.12.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 56/552/812 ms
RM-R2(config)#

Pada PPP, username harus menggunakan hostname lawanya. Jika kita ingin menggunakan username yang lain, konfigurasikan sebagai berikut.
RM-R2(config)#username NJEPAT password NJEPATTT
RM-R2(config)#interface virtual-template1
RM-R2(config-if)#ppp chap hostname KATOK

RM-R1(config)#username KATOK password NJEPATTT
RM-R1(config)#interface virtual-template1
RM-R1(config-if)#ppp chap hostname NJEPAT

RM-R1(config-if)#do sh ppp multilink
Virtual-Access4, bundle name is KATOK
  Username is KATOK
  Endpoint discriminator is KATOK
  Bundle up for 00:00:25, total bandwidth 200000, load 1/255
  Receive buffer limit 24384 bytes, frag timeout 1000 ms
    0/0 fragments/bytes in reassembly list
    0 lost fragments, 0 reordered
    0/0 discarded fragments/bytes, 0 lost received
    0x2 received sequence, 0x1 sent sequence
  Member links: 2 (max not set, min not set)
    Vi3, since 00:00:25
    Vi1, since 00:00:25
No inactive multilink interfaces
RM-R1(config-if)#

RM-R2(config-if)#do sh ppp multilink
Virtual-Access4, bundle name is NJEPAT
  Username is NJEPAT
  Endpoint discriminator is NJEPAT
  Bundle up for 00:00:53, total bandwidth 200000, load 1/255
  Receive buffer limit 24384 bytes, frag timeout 1000 ms
    0/0 fragments/bytes in reassembly list
    0 lost fragments, 0 reordered
    0/0 discarded fragments/bytes, 0 lost received
    0x1 received sequence, 0x2 sent sequence
  Member links: 2 (max not set, min not set)
    Vi3, since 00:00:53
    Vi1, since 00:00:53
No inactive multilink interfaces
RM-R2(config-if)#

RM-R2(config-if)#do ping 12.12.12.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 12.12.12.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 148/481/708 ms
RM-R2(config-if)#