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 primary tunnel interface.
I believe is “D”
0
0
The answer is “D”.
Interface State Control
The Interface State Control feature allows NHRP to control the state of the interface based on whether the tunnels on the interface are live. If NHRP detects that all NHSs configured on the interface are in the down state, NHRP can change the interface state to down. However, if NHRP detects that any one of the NHSs configured on the interface is up, then it can change the state of the interface to up.
When the NHRP changes the interface state, other Cisco IOS services can react to the state change, for example:
If the interface state changes, the generic routing and encapsulation (GRE) interface generates IF-MIB notifications (traps) that report a LinkUp or LinkDown message. The system uses these traps to monitor the connectivity to the DMVPN cloud.
If the interface state changes to down, the Cisco IOS backup interface feature can be initiated to allow the system to use another interface to provide an alternative path to the failed primary path.
If the interface state changes to down, the system generates an update that is sent to all dynamic routing protocols. This provides a failover mechanism for dynamic routing when the multipoint GRE (mGRE) interface is down.
If the interface state changes to down, the system clears any static routes that use the mGRE interface as the next hop. This provides a failover mechanism for routing when the mGRE interface is down.
The interface state control feature works on both point-to-point and mGRE interfaces.
0
0
By the way, part of the new 307Q 300-209 dumps are available here:
https://drive.google.com/open?id=0B-ob6L_QjGLpVTNFVTRPdC0zTnM
Best Regards!
0
0