Reference Guide

Session State Changes
The following illustration shows how the session state on a system changes based on the status notification it receives from the
remote system. For example, if a session on a system is down and it receives a Down status notification from the remote
system, the session state on the local system changes to Init.
Figure 10. Session State Changes
Important Points to Remember
● On the Z9500, the system supports 128 sessions at 200 minimum transmit and receive intervals with a multiplier of 3, and 64
sessions at 100 minimum transmit and receive intervals with a multiplier of 4.
● Enable BFD on both ends of a link.
● Demand mode, authentication, and the Echo function are not supported.
● BFD is not supported on multi-hop and virtual links.
● Protocol Liveness is supported for routing protocols only.
● The Z9500 supports only OSPF, IS-IS, and VRRP protocols as BFD clients; BGP is not supported.
Configure BFD
This section contains the following procedures.
● Configure BFD for Static Routes
● Configure BFD for OSPF
● Configure BFD for OSPFv3
● Configure BFD for IS-IS
● Configure BFD for BGP
● Configure BFD for VRRP
● Configuring Protocol Liveness
Bidirectional Forwarding Detection (BFD)
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