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300-410 Practice Question: Drag and drop the steps to troubleshoot an MPLS…
Drag and drop the steps to troubleshoot an MPLS L3VPN adjacency or connectivity failure into the correct order, from first to last.
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Check PE-CE BGP adjacency state
Troubleshooting begins by verifying the PE-CE adjacency with 'show ip bgp vpnv4 vrf <name> summary'. If the adjacency is down, check the VRF interface status and IP connectivity using ping. Then verify that the VRF is correctly configured with 'show vrf'. Next, confirm that the MPLS LSP to the remote PE is functional using 'show mpls lsp'. Finally, check that the VPNv4 routes are being exchanged between PEs with 'show bgp vpnv4 unicast all'.
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OSPF Neighbor Adjacency and Basics
Key term
MP-BGP for VPN
MP-BGP for VPN is an extension of the Border Gateway Protocol that carries multiple types of network layer information to enable scalable, isolated virtual private networks over a shared provider infrastructure.
Key term
LDP Protocol
LDP, or Label Distribution Protocol, is a protocol that routers use to automatically exchange labels that enable MPLS (Multiprotocol Label Switching) to create fast, efficient paths for data packets across a network.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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