Dell S4048T, Configuration Manual

Page: 190 / 1277

• Establish sessions with OSPF neighbors on a single interface.
INTERFACE mode
ip ospf bfd all-neighbors
Example of Verifying Sessions with OSPF Neighbors
To view the established sessions, use the
show bfd neighbors
command.
The bold line shows the OSPF BFD sessions.
R2(conf-router_ospf)#bfd all-neighbors
R2(conf-router_ospf)#do show bfd neighbors
* - Active session role
Ad Dn - Admin Down
C - CLI
I - ISIS
O - OSPF
R - Static Route (RTM)
LocalAddr RemoteAddr Interface State Rx-int Tx-int Mult Clients
* 2.2.2.2 2.2.2.1 Te 2/1 Up 100 100 3 O
* 2.2.3.1 2.2.3.2 Te 2/2 Up 100 100 3 O
Changing OSPFv3 Session Parameters
Configure BFD sessions with default intervals and a default role.
The parameters that you can configure are:
desired tx interval
,
required min rx interval
,
detection multiplier
, and system
role
. Configure these parameters for all OSPFv3 sessions or all
OSPFv3 sessions on a particular interface. If you change a parameter globally, the change affects all OSPFv3
neighbors sessions. If you change a parameter at the interface level, the change affects all OSPFv3 sessions
on that interface.
To change parameters for all OSPFv3 sessions or for OSPFv3 sessions on a single interface, use the following
commands.
To view session parameters, use the
show bfd neighbors detail
command, as shown in the example in
Displaying BFD for BGP Information .
• Change parameters for all OSPFv3 sessions.
ROUTER-OSPFv3 mode
bfd all-neighbors interval milliseconds min_rx milliseconds multiplier value
role [active | passive]
• Change parameters for OSPFv3 sessions on a single interface.
INTERFACE mode
ipv6 ospf bfd all-neighbors interval milliseconds min_rx milliseconds multiplier
value role [active | passive]
Disabling BFD for OSPFv3
If you disable BFD globally, all sessions are torn down and sessions on the remote system are placed in a
Down state.
If you disable BFD on an interface, sessions on the interface are torn down and sessions on the remote
system are placed in a Down state. Disabling BFD does not trigger a change in BFD clients; a final Admin
Down packet is sent before the session is terminated.
Bidirectional Forwarding Detection (BFD) 190