A spoke has two Internet connections for failover. How can you achieve optimum failover without affecting any other router in the DMVPN cloud?
A.
Create another DMVPN cloud by configuring another tunnel interface that is sourced from the second ISP link.
B.
Use another router at the spoke site, because two ISP connections on the same router for the same hub is not allowed.
C.
Configure SLA tracking, and when the primary interface goes down, manually change the tunnel source of the tunnel interface.
D.
Create another tunnel interface with same configuration except the tunnel source, and configure the if-state nhrp and backup interface commands on the
The Interface State Control feature enables the system to control the state of an interface based on whether the DMVPN tunnels connected to the interface are live or not. if-state nhrp is typically configured on spoke.
The DMVPN-Tunnel Health Monitoring and Recovery (Backup NHS) feature allows you to control the number of connections to the DMVPN hub and allows you to switch to alternate hubs in case of connection failure to primary hubs. Typically, you can use CLustering. Also NHS clusterless model is a model where you assign the priority values to the NHSs and do not place the NHSs into any group. NHS clusterless model groups all NHSs to a default group and maintains redundant connections based on the maximum NHS connections configured.
NHS priority is a numerical value assigned to a hub that controls the order in which spokes select hubs to establish a spoke-to-hub tunnel. The priority value ranges from 0 to 255, where 0 is the highest and 255 is the lowest priority.
https://www.cisco.com/en/US/docs/ios-xml/ios/sec_conn_dmvpn/configuration/15-2mt/sec-conn-dmvpn-backup-nhs.html#GUID-11FFA7A1-18BD-429D-B10B-5B8B47141426
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Dante8880
2 years, 5 months ago