19 Des 2016 · 11.461 kali dibaca
OSPF Multi-Area di Cisco: Convergence dari 30 Detik ke 8
50 router single-area, convergence lambat. Multi-area: backbone + stub area, jadi cepat.
Network sekitar 50 router. Single-area OSPF (area 0 saja) sudah lambat — convergence 30+ detik saat link flap.
Solusi: multi-area design. Backbone area 0, branch areas 1-9.
Topologi:
- Area 0: pusat (Jakarta)
- Area 1: Bandung
- Area 2: Surabaya
- Area 3: Medan
- ABR (Area Border Router) menghubungkan area ke 0
Cisco IOS:
router ospf 1
router-id 1.1.1.1
area 0 authentication message-digest
area 1 stub
network 10.0.0.0 0.0.0.255 area 0
network 10.1.0.0 0.0.255.255 area 1
Stub area di branch — kurangi LSA flooding. Branch tidak perlu tahu detail backbone, cukup default route.
Convergence turun jadi 5-8 detik. CPU OSPF process turun signifikan.
LSA debug: debug ip ospf events. Pelan-pelan saat troubleshooting — banyak output, gampang membanjir.