Cara Konfigurasi BackboneFast di Switch Cisco GNS3

Tool ini HANYA dipake di PVST untuk improve convergence (di RSTP udah built-in)

Backbonefast fungsinya biar klo link ke ROOT BRIDGE mati, mereka langsung kirim BPDU ke alternate/blocked port trus sama switch penerima BPDU tersebut langsung ngirim RLQ (root link query) message untuk nyari siapa yang jadi Root Bridge selanjutnya (skip 20 second of max_age timer that cause other non-Root bridge become root-bridge itself).

Konfigurasi Bacbone fast di semua swith

S1#configure

S1(config)#spanning-tree backbonefast

Verifikasi dimasing-masing switch.

S1#show spanning-tree backbonefast

BackboneFast is enabled

BackboneFast statistics

-----------------------

S1#show spanning-tree summary

Switch is in pvst mode

Root bridge for: VLAN0001

EtherChannel misconfig guard is enabled

Extended system ID is enabled

Portfast Default is disabled

PortFast BPDU Guard Default is disabled

Portfast BPDU Filter Default is disabled

Loopguard Default is disabled

UplinkFast is disabled

BackboneFast is enabled

Configured Pathcost method used is short

Lalu testing PING dari PC-2 ke PC-1, dan lihat perbedaan dengan mengaktifkan Backbonefast dengan tidak,

Tanpa Backkbone Fast (Jumlah TTL)

192.168.0.1 icmp_seq=22 timeout

192.168.0.1 icmp_seq=23 timeout

192.168.0.1 icmp_seq=24 timeout

192.168.0.1 icmp_seq=25 timeout

192.168.0.1 icmp_seq=26 timeout

192.168.0.1 icmp_seq=27 timeout

192.168.0.1 icmp_seq=28 timeout

192.168.0.1 icmp_seq=29 timeout

192.168.0.1 icmp_seq=30 timeout

192.168.0.1 icmp_seq=31 timeout

192.168.0.1 icmp_seq=32 timeout

192.168.0.1 icmp_seq=33 timeout

192.168.0.1 icmp_seq=34 timeout

192.168.0.1 icmp_seq=35 timeout

192.168.0.1 icmp_seq=36 timeout

192.168.0.1 icmp_seq=37 timeout

192.168.0.1 icmp_seq=38 timeout

192.168.0.1 icmp_seq=39 timeout

192.168.0.1 icmp_seq=40 timeout

192.168.0.1 icmp_seq=41 timeout

192.168.0.1 icmp_seq=42 timeout

192.168.0.1 icmp_seq=43 timeout

192.168.0.1 icmp_seq=44 timeout

Dengan Backkbone Fast (Jumlah TTL)