711
TDP
Medium RiskTCP — Other
Port Overview
Port Number
711
Service Name
TDP
Transport Protocol
TCP
Category
Other
Security Risk
Medium
Port Range
Well-Known (0-1023)
What is Port 711?
Tag Distribution Protocol (TDP), a Cisco proprietary precursor to the IETF-standardized LDP on port 646, used in early MPLS deployments. Deprecated in favor of LDP.
TCP
Other
Security Considerations
Port 711 (TDP) is classified as medium risk. While this service is commonly exposed, consider using encrypted alternatives where available.
Recommendation: Keep the service updated. Monitor logs for unusual activity.