Administrator Guide

Changing VRRP Session Parameters
BFD sessions are congured with default intervals and a default role.
The parameters that you can congure are: Desired TX Interval, Required Min RX Interval, Detection Multiplier, and system role. You can
change parameters for all VRRP sessions or for a particular neighbor.
To change parameters for all VRRP sessions or for a particular VRRP session, use the following commands.
• Change parameters for all VRRP sessions.
INTERFACE mode
vrrp bfd all-neighbors interval milliseconds min_rx milliseconds multiplier value role [active
| passive]
• Change parameters for a particular VRRP session.
INTERFACE mode
vrrp bfd neighbor ip-address interval milliseconds min_rx milliseconds multiplier value role
[active | passive]
To view session parameters, use the show bfd neighbors detail command, as shown in the example in Verifying BFD Sessions
with BGP Neighbors Using the show bfd neighbors command example in Displaying BFD for BGP Information.
Disabling BFD for VRRP
If you disable any or all VRRP sessions, the sessions are torn down.
A nal Admin Down control packet is sent to all neighbors and sessions on the remote system change to the Down state.
To disable all VRRP sessions on an interface, sessions for a particular VRRP group, or for a particular VRRP session on an interface, use the
following commands.
• Disable all VRRP sessions on an interface.
INTERFACE mode
no vrrp bfd all-neighbors
• Disable all VRRP sessions in a VRRP group.
VRRP mode
bfd disable
• Disable a particular VRRP session on an interface.
INTERFACE mode
no vrrp bfd neighbor ip-address
Congure BFD for VLANs
BFD on Dell Networking systems is a Layer 3 protocol.
Use BFD with routed virtual local area networks (VLANs). BFD on VLANs is analogous to BFD on physical ports. If you enable the no
routing protocol, and a remote system fails, the local system does not remove the connected route until the rst failed attempt to send a
packet. If you enable BFD, the local system removes the route when it stops receiving periodic control packets from the remote system.
There is one BFD agent for VLANs and port-channels that resides on RP2, as opposed to the other agents that are on the line card.
Therefore, the 100 total possible sessions that this agent can maintain is shared for VLANs and port-channels.
Conguring BFD for VLANs is a two-step process:
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Bidirectional Forwarding Detection (BFD)