MPLS Concepts MPLS Loop Mitigation
In IP networks TTL is used to mitigate routing loops and prevent packets being forwarded indefinitely
- TTL is decremented at each router-hop
- If TTL = 0 packet is discarded
MPLS may use same mechanism but not on all encapsulations
- TTL is present in the label header for PPP and LAN headers (shim headers)
- ATM cell header does not have TTL