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DES-7200 Configuration Guide Chapter 3 BFD Configuration
3-8
1. RIPv1、RIPV2
2. OSPFv2
3. BGP
Firmware v10.4(3) and later also support the OSPFv3 route protocol. Make sure
that the BFD for corresponding protocol is enabled on all BFD session
neighbors, or the BFD session cannot be established. However, if the dynamic
route protocol or other applications have already notify the BFD of establishing
the session with the corresponding neighbor, the BFD for this protocol will be
established automatically.
3.2.6 BFD for Static Route
Configuring BFD for static route prevents the static route from being the
forwarding path when the router selects the routing under the circumstances
that the configured static route is unreachable. It can rapidly switch to the
backup forwarding path if the backup forwarding path exists.
Being different from the dynamic route protocol, the static route protocol has no
mechanism of discovering the neighbor. Therefore, when configuring the BFD
for static route, the reachability of the next-hop of the static route is dependent
on the BFD session state. If the BFD session detects the fault, which means
that next-hop of the static route is unreachable, the static route can not be
installed into the RIB. Make sure that the BFD for static route is enabled on all
BFD session neighbors, or the BFD session cannot be established. However, if
the dynamic route protocol or other applications have already notify the BFD of
establishing the session with the corresponding neighbor, the BFD for static
route will be enabled automatically.
If the BFD session is removed from the peer in the process of the BFD session
establishment, the BFD session will be down. And under this circumstance, the
static route forwarding shall be ensured.
3.2.7 BFD for PBR
Configuring BFD for PBR prevents the PBR from being the forwarding path
when the router selects the routing under the circumstances that the configured
PBR is unreachable. It can rapidly switch to the backup forwarding path if the
backup forwarding path exists.
The method of BFD for PBR is similar to the BFD for static route. If the BFD
session detects the fault by following the forwarding path of the specified
neighbor, the PBR will be notified of the unreachability to the corresponding
next-hop. The PBR reaching the next-hop is ineffective.