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Dell SmartFabric OS10 User Guide Release 10.5.3

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BFD in VLT Domain

OS10 supports bidirectional forwarding detection (BFD) to detect communication failures on an interface that is a part of a VLT port-channel. BFD replaces link-state detection mechanisms in existing routing protocols. It also provides a failure detection solution for links with no routing protocols. For more information about BFD, see Bidirectional Forwarding Detection.

In a VLT domain, BFD provides a high-availability path when there are communication failures in any of the VLT port-channel links. The VLT nodes and top-of-rack (ToR) use the VLT port-channel links to carry the BFD packets. When any of the VLT port-channel links connected to the ToR is down, the BFD packets reach the VLT primary or secondary using the VLTi link. BFD is supported over VLT only when you enable peer routing on both peers.

NOTE: The BFD session with primary VLT peer could flap when VLTi goes down. BFD keepalive messages destined to the primary VLT peer could hash to the secondary VLT peer for a small interval before the secondary brings down its VLT port-channel after the VLTi went down, leading to the flap. As a workaround, use a higher BFD timer to avoid the flap or bring down the VLT port-channel on the secondary node before bringing down the VLTi in planned VLTi-down scenarios.

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