ACI BFD Support Overview
- Supported Protocols: BFD is supported for BGP external
routed networks.
- Purpose: BFD provides sub-second failure detection between
ACI leaf switches and external routers, improving convergence and
reliability.
- Multihop BFD: Supported from APIC Release
5.0(1) onward.
- C-bit-aware BFD: ACI supports control-plane-aware
BFD, allowing you to configure whether BFD sessions are dependent or
independent of the control plane
🔧 Configuration Guidelines
To configure BFD in
ACI:
- Create or Edit a BGP Peer Connectivity
Profile:
- Navigate to L3Out > Node
Profile > BGP Peer Connectivity Profile
- Enable BFD under the
peer settings.
- Ensure Loopback Interfaces:
- For multihop BFD, loopback
interfaces are required.
- Each L3Out should have a unique
loopback IP for BGP peering.
- MTU Considerations:
- ACI does not support IP
fragmentation, so ensure MTU is properly configured on both ends.
- Recommended: Test MTU using CLI tools
like ping df-bit packet-size.
- Platform Compatibility:
- BFD support may vary slightly depending
on the ACI hardware model (e.g., N9K-C9336PQ,
N9K-C93180YC-EX).
- Always verify compatibility in the
release notes or hardware documentation.
⚠️ Limitations
- BFD is not supported for OSPF or
EIGRP in ACI.
- BFD configuration is only applicable
to external routed networks (L3Out), not internal fabric
routing.
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