You are designing a large-scale DMVPN network with more than 500 spokes using EIGRP as the IGP protocol. Which design option eliminates potential tunnel down events on the spoke routers due to the holding time expiration?
A.
Increase the hold queue on the physical interface of the hub router
B.
Increase the hold queue on the tunnel interface of the spoke routers
C.
Increase the hold queue on the tunnel interface of the hub router
D.
Apply QoS for pak_priority class
E.
Increase the hold queue on the physical interface of the spoke routers
In DMVPN designs with many spokes, spokes may fail to receive periodic keepalives or routing updates if queues overflow during congestion, causing holding timers to expire and tunnels to flap. Increasing the hold queue size on the tunnel interface of the spoke routers allows them to buffer control plane packets during congestion and avoid premature tunnel teardown.
Why other options are incorrect:
A, C, E: Physical interface queues do not directly affect tunnel protocol timers.
D: QoS may help prioritize control plane traffic but doesn ' t address queue depth directly, which is the root cause of the issue.
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