If attributes of a working MPLS TE tunnel, such as bandwidth, are modified, a new path is set up for the tunnel using modified attributes, and service traffic is switched to the new path. Reliability technologies are required to prevent or minimize packet loss in the process.
If a node or link on a working MPLS TE tunnel fails, reliability technologies are required to set up a backup CR-LSP and switch traffic to the backup CR-LSP, while minimizing packet loss in this process.
When a node on a working MPLS TE tunnel encounters a control plane failure but its forwarding plane is still working properly, reliability technologies are required to ensure nonstop traffic forwarding during fault recovery on the control plane.
Reliability Technology |
Description |
Function |
|---|---|---|
Tunnel attribute update reliability |
Ensures reliable traffic transmission when a CR-LSP is set up because of attribute updates. |
|
Fault detection |
Rapidly detects MPLS TE network faults and triggers protection switching. |
|
Traffic protection |
Network-level reliability: provides end-to-end path protection and local protection. |
|
Device-level reliability: ensures that nonstop forwarding when the control plane fails on a node. |