- Is LDP Enabled?
- ‘show mpls interfaces’
- Is LDP Transport working?
- ‘debug mpls ldp transport events’
- Is LDP session authenticated?
- Like BGP, LDP uses TCP auth (option 19)
- Are labels actually bound?
- ‘show mpls ldp binding’
- ‘show mpls forwarding-table’
- ‘debug mpls ldp binding’
- Is allocation being filtered?
- Advertise filter vs. allocate filter.
- Typically only /32 needs an allocation.
- PE-CE Routing
- Is loop prevention being violated?
- OSPF down-bit and domain-tag.
- BGP AS-path and Site-of-Origin (SoO)
- EIGRP Site-of-Origin
- VRF Hung
- ‘clear ip route vrf *’
- Forces re-import/export
- Is loop prevention being violated?
- VPNv4 BGP
- Is RT being filtered?
- Wrong import/export policy
- Default route target filter
- VPNv4 Route Reflection
- Is RT being filtered?
- MPLS Data Plane
- Is VPNv4 peering to a /32?
- Problems in PHP
- The last label will be popped early.
- Problems in route summarization.
- Problems in PHP
- Are LDP and IGP synced?
- LFIB can only install label for RIB/LRIB intersection.
- Is VPNv4 peering to a /32?
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