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Table Of Contents
Graceful restart
When a networking device restarts, the adjacent neighbors and peers detect the condition. During a graceful restart, the
restarting device and neighbors continue to forward the packets without interrupting network performance. The neighbors that
help in the restart process are called helper routers.
When you enable graceful restart, the restarting device retains the routes learned by OSPF in the forwarding table. To
re-establish OSPF adjacencies with neighbors, the restart OSPF process sends a grace LSA to all neighbors. In response, the
helper router enters Helper mode and sends an acknowledgement back to the restarting device.
OS10 supports graceful restart Helper mode. Use the graceful-restart role helper-only command to enable Helper
mode in ROUTER OSPF mode.
OS10(config)# router ospf 10
OS10(conf-router-ospf-10)# graceful-restart role helper-only
Use the no version of the command to disable Helper mode.
OSPFv2 authentication
You can enable OSPF authentication either with clear text or MD5.
● Set a clear text authentication scheme on the interface in INTERFACE mode.
ip ospf authentication-key key
● Set MD5 authentication in INTERFACE mode.
ip ospf message-digest-key keyid md5 key
Configure text authentication
OS10(config)# interface ethernet 1/1/1
OS10(conf-if-eth1/1/1)# ip ospf authentication-key sample
View text authentication
OS10(conf-if-eth1/1/1)# show configuration
!
interface ethernet1/1/1
ip address 10.10.10.2/24
no switchport
no shutdown
ip ospf 100 area 0.0.0.0
ip ospf authentication-key sample
Configure MD5 authentication
OS10(config)# interface ethernet 1/1/1
OS10(conf-if-eth1/1/1)# ip ospf message-digest-key 2 md5 sample12345
View MD5 authentication
OS10(conf-if-eth1/1/1)# show configuration
!
interface ethernet1/1/1
ip address 10.10.10.2/24
no switchport
no shutdown
ip ospf 100 area 0.0.0.0
ip ospf message-digest-key 2 md5 sample12345
Troubleshoot OSPFv2
You can troubleshoot OSPFv2 operations, and check questions for typical issues that interrupt a process.
● Is OSPF enabled globally?
Layer 3
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