Users Guide

When you configure BFD, next-hop reachability depends on the BFD state of the BFD session corresponding to the specified
next hop. If the BFD session of the configured next hop is down, the static route is not installed in the RIB.
The BFD session must be up for the static route. You must configure BFD on both the peers pointing to its neighbor as the next
hop. There is no dependency on the configuration order of the static route and BFD configuration. You can configure BFD for all
static routes or for specific static routes. OS10 supports BFD for both IPv4 and IPv6 static routes.
Enable BFD for all static routes
Configuring BFD for static routes is a three-step process:
1. Enable BFD globally.
2. Configure static routes on both routers on the system (either local or remote). Configure the static route in such a way that
the next-hop interfaces point to each other.
3. Configure BFD for static route using the ip route bfd command.
Establishing BFD Sessions for IPv4 Static Routes
Sessions are established for all neighbors that are the next hop of a static route.
To establish a BFD session, use the following command.
Establish BFD sessions for all neighbors that are the next hop of a static route.
ip route bfd [interval interval min_rx min_rx multiplier value role {active | passive}]
CONFIGURATION Mode
Enter the time interval for sending and receiving BFD control packets from 50 to 1000.
Establishing BFD Sessions for IPv4 Static Routes in a non-default VRF
instance
To establish a BFD session for IPv4 static routes in a non-default VRF instance, use the following command.
Establish BFD sessions for all neighbors that are the next hop of a static route.
ip route bfd [vrf vrf-name] [interval interval min_rx min_rx multiplier value role {active
| passive}]
CONFIGURATION Mode
Enter the time interval for sending and receiving BFD control packets from 50 to 1000.
Changing IPv4 static route session parameters
Configure BFD sessions with default intervals and a default role.
Configure the following for all static routes:
● Desired TX Interval
● Required Min RX Interval
● Detection Multiplier
● system role
These parameters are configured for all static routes. If you change a parameter, the change affects all sessions for static
routes. To change parameters for static route sessions, use the following command.
● Change the parameters for all static route sessions in CONFIGURATION mode.
ip route bfd interval milliseconds min_rx milliseconds multiplier value role [active |
passive]
Enter the time interval for sending and receiving BFD control packets; from 50 to 1000.
NOTE:
By default, OSPF uses the following BFD parameters for its neighbors: min_tx = 200 msec, min_rx = 200 msec,
multiplier = 3, role = active.
602 Layer 3