Cisco OSPF

Open Shortest Path First

Grannskap

Neighbors måste komma överens om:

• Subnät/Mask
• Area
• Timers
• Olika router-ID
• Flaggor: Stub, NSSA
• MTU
• Authentication type
• Kompatibla nätverkstyper, DR-election eller ej

Konfiguration

router ospf [process-id]

router-id for this OSPF process (in IP address format)

router-id [OSPF router-id] 

log-adjacency-changes

Enable routing on an IP network

network [network-number] [wildcard-mask] area [area-id]

Enable MD5 authentication in Area 0

area 0 authentication message-digest

Enable OSPF authentication on an interface

interface [interface]
ip ospf message-digest-key 10 md5 [password]
exit

Suppress routing updates on an interface

passive-interface [interface]

default-information originate

interface [interface]
ip ospf priority [number]
exit

ABR Summarization

router ospf 1
area 10 range 10.10.0.0 255.255.252.0
exit

ASBR Summarization

router ospf 1
summary-address 10.10.0.0 255.255.252.0
exit

router ospf 1
auto-cost reference-bandwidth 1000
exit

loopback - ospf

ip ospf network point-to-point
exit

Troubleshoot

show ip ospf neighbor
ping 224.0.0.5
show ip ospf interface brief
show ip protocols