Implementing OSPF on Cisco IOS XR Software
How to Implement OSPF on CiscoIOS XR Software
RC-251
Cisco IOS XR Routing Configuration Guide
OL-14356-01
Configuring Generalized TTL Security Mechanism (GTSM) for OSPF
This task explains how to set the security time-to-live mechanism on an interface for GTSM.
SUMMARY STEPS
1. configure
2. router ospf process-name
3. router-id {router-id}
4. log adjacency changes [detail] [disable]
5. nsf {cisco [enforce global] | ietf [helper disable]}
6. timers throttle spf spf-start spf-hold spf-max-wait
7. area area-id
8. interface type instance
9. security ttl [disable | hops hop-count]
10. end
or
commit
11. show ospf [process-name] [vrf vrf-name] [area-id] interface [type instance]
DETAILED STEPS
Command or Action Purpose
Step1 configure
Example:
RP/0/RP0/CPU0:router# configure
Enters global configuration mode.
Step2 router ospf process-name
Example:
RP/0/RP0/CPU0:router(config)# router ospf 1
Enables OSPF routing for the specified routing process and
places the router in router configuration mode.
Note The process-name argument is any alphanumeric
string no longer than 40 characters.
Step3 router-id {router-id}
Example:
RP/0/RP0/CPU0:router(config-ospf)# router id
100.100.100.100
Configures a router ID for the OSPF process.
Note We recommend using a stable IPv4 address as the
router ID.
Step4 log adjacency changes [detail] [enable | disable]
Example:
RP/0/RP0/CPU0:router(config-ospf-ar-if)# log
adjacency changes detail
(Optional) Requests notification of neighbor changes.
•By default, this feature is enabled.
•The messages generated by neighbor changes are
considered notifications, which are categorized as
severity Level 5 in the logging console command. The
logging console command controls which severity
level of messages are sent to the console. By default, all
severity level messages are sent.