--> We need to select a best routing protocol in dmvpn for routing,depending upon the design requirements.
1) OSPF:
--> By default OSPF Point to Point Network is not supported in DMVPN because in point to point network hub expects only one neighbor not more than one neighbor.
--> In DMVPN, either we have to use Point to MultiPoint Network or Broadcast Network for routing.
--> If we use Broadcast OSPF network, Next Hop value will be unchanged, whereas if we use Point to Multipoint Network, Next Hop will be always pointing to Hub.
--> If we use Point to multipoint ospf network type always traffic will go via hub router which is not recommended in phase 2 & 3.
--> Only Next Hop Server can send OSPF Hellos to other routers, so configure hub router with high priority so it always selected as DR & configure spoke routers with ospf priority zero so that they cannot participate in elections.
--> Generally OSPF is not scalable in DMVPN network ( not recommended for DMVPN).
2) BGP:
--> BGP is recommended in DMVPN, if we have more number of spokes as it does not have scalablilty issues ( No Multicast Flooding).
--> Go with EBGP neighbor relationship between Hub & Spoke to remove IBGP neighbor relationship problems.
3) EIGRP & RIP
--> Need to disable split horizon
--> Need to configure eigrp next hop self command
1) OSPF:
--> By default OSPF Point to Point Network is not supported in DMVPN because in point to point network hub expects only one neighbor not more than one neighbor.
--> In DMVPN, either we have to use Point to MultiPoint Network or Broadcast Network for routing.
--> If we use Broadcast OSPF network, Next Hop value will be unchanged, whereas if we use Point to Multipoint Network, Next Hop will be always pointing to Hub.
--> If we use Point to multipoint ospf network type always traffic will go via hub router which is not recommended in phase 2 & 3.
--> Only Next Hop Server can send OSPF Hellos to other routers, so configure hub router with high priority so it always selected as DR & configure spoke routers with ospf priority zero so that they cannot participate in elections.
--> Generally OSPF is not scalable in DMVPN network ( not recommended for DMVPN).
2) BGP:
--> BGP is recommended in DMVPN, if we have more number of spokes as it does not have scalablilty issues ( No Multicast Flooding).
--> Go with EBGP neighbor relationship between Hub & Spoke to remove IBGP neighbor relationship problems.
3) EIGRP & RIP
--> Need to disable split horizon
--> Need to configure eigrp next hop self command
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