HP 4800G Series Configuration Manual page 1592

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One network segment can only belong to one area and you must specify each OSPF interface to
belong to the specific area.
Both ends of a BFD session must be on the same network segment and in the same area.
For OSPF configuration, refer to OSPF Configuration in the IP Routing Volume.
Configuring BFD for IS-IS
Before the following configuration, configure IS-IS basic functions on each node.
Follow these steps to enable BFD on an IS-IS interface:
To do...
Enter system view
Enter interface view
Enable IS-IS on the interface
Enable BFD on the IS-IS
interface
For details about IS-IS, refer to IS-IS Configuration in the IP Routing Volume.
Configuring BFD for RIP
RIP periodically sends route update requests to neighbors. If no route update response for a route is
received within the specified interval, RIP considers the route unreachable. This mechanism cannot
detect link faults quickly.
After BFD is configured for RIP, when BFD detects a broken link, RIP can quickly age out the
unreachable route before the update timer expires.
RIP with BFD support provides two link detection modes:
Single-hop detection in BFD echo packet mode for a directly connected neighbor. In this mode, a
BFD session is established only when the neighbor has route information to send.
Bidirectional detection in BFD control packet mode for an indirectly connected neighbor. In this
mode, a BFD session is established only when both ends have routes to send and BFD is enabled
on the receiving interface.
Single-hop detection in BFD echo packet mode
Follow these steps to configure BFD for RIP (single-hop detection in BFD echo packet mode):
Use the command...
system-view
interface interface-type
interface-number
isis enable [ process-id ]
isis bfd enable
1-7
Remarks
Required
Disabled by default
Required
Not enabled by default

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