Differences between dynamic BFD for IS-IS and static BFD for IS-IS on S series switches

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The differences between dynamic BFD for IS-IS and static BFD for IS-IS are as follows:
Dynamic BFD for IS-IS is triggered by upper-layer protocols. BFD sessions are dynamically established and link failures are detected based on BFD session status.
Static BFD for IS-IS is manually configured to detect link failures.

Other related questions:
How do I distinguish a single-hop BFD session and a multi-hop BFD session
Static BFD sessions: When the session is created for the first time, a single-hop BFD session is bound to a local interface while a multi-hop session is not. Dynamic BFD sessions: Query the routes to determine whether a BFD session is a single-hop session or a multi-hop session. BFD for Internal Border Gateway Protocol (IBGP) sessions are multi-hop sessions.

Can S series switches support BFD
S series switches' (except S1700 switches) support for BFD is described as follows: - S2700 series: not supported - S3700 series: not supported by SI series, but supported by EI and HI series - S5700 series: not supported by SI and LI series, but supported by EI and HI series - S6700 series: supported - S7700 series: supported - S9700 series: supported - S9300 series: supported - S12700 series: supported

Differences between static and dynamic routes
The differences between static and dynamic routes are as follows: Static routes are easy to configure, have low requirements on the system, and apply to simple, stable, and small networks. The disadvantage of static routes is that they cannot automatically adapt to network topology changes. Therefore, static routes require subsequent maintenance. Dynamic routing protocols have their routing algorithms. Therefore, dynamic routes can automatically adapt to network topology changes and apply to the networks on which Layer 3 devices are deployed. The configurations of dynamic routes are complex. Dynamic routes have higher requirements on the system than static ones and consume network resources and system resources.

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