Limitations Of Lfa Frr; Mldp Lfa Frr - Working - Cisco ASR 9000 Series Configuration Manual
Aggregation services router multicast
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Implementing Layer-3 Multicast Routing on Cisco IOS XR Software
• Supports switchover time to be independent of the number of multicast routes that has to be switched
over
Limitations of LFA FRR
The following are some of the known limitations of the LFA FRR solution:
• When a failure that is more extensive than that which the alternate was intended to protect occurs, there
is the possibility of temporarily looping traffic (micro looping until Control Plane Convergence).
• Topology dependent. For example, either MPLS or MLDP dependent.
• Complex implementation.
• The solution is currently not supported on all platforms.
MLDP LFA FRR - Working
To enable FRR for mLDP over physical or bundle interfaces, LDP session-protection has to be configured.
The sequence of events that occur in an mLDP LFA FRR scenario is explained with the following example:
Figure 11: MLDP LFA FRR - Setup
In this figure:
1 Router A is the source provider edge router, and the next Hop is Router B.
2 The primary path is Router A -> Router B - > Router D, and the backup path is from Router A -> Router
C -> Router B -> Router D. The backup path is pre-computed by IGP through LFA prefix-based selection.
3 Backup tunnels are configured for Link A or auto-tunnels are enabled.
4 MLDP LSP is build from D, B, and A towards the root.
Cisco ASR 9000 Series Aggregation Services Router Multicast Configuration Guide, Release 6.0.x
MLDP Loop-Free Alternative Fast Reroute
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