DMVPN - Phase 2 EIGRP neighbor adjacencies

DMVPN - Phase 2 OSPF neighbor adjacencies


Unlike [OSPF](/ospf) and [EIGRP](/eigrp), in a [DMVPN](/dmvpn) Phase 2 arrangement, it is possible to create [BGP](/bgp) peerings between spoke routers.

[OSFP neighbors](/dmvpn-phase-2-ospf-neighbor-adjacencies) and [EIGRP neighbors](/dmvpn-phase-2-eigrp-neighbor-adjacencies) are not possible between spoke routers in a DMVPN Phase 2 environment.  However, unlike OSPF and EIGRP, BGP uses [TCP](/tcp) connections to the specific network address of the neighbor to create its adjacencies. DMVPN Phase 2 supports such direct communication implicitly, so there is no restriction to the creation of such peerings. This applies for both [eBGP](/bgp-definition-of-external-bgp-ebgp) and [iBGP](/bgp-definition-of-internal-bgp-ibgp).

Links:

https://forum.networklessons.com/t/dmvpn-phase-2-bgp-routing/1310/14?u=lagapides

https://networklessons.com/cisco/ccie-routing-switching/dmvpn-phase-2-bgp-routing

DMVPN - Phase 2 BGP peerings

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DMVPN - Phase 2 BGP peerings

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