Configuring Bfd For Port-Channels - Dell Force10 Z9000 Configuration Manual

Changing session parameters
BFD sessions are configured with default intervals and a default role. The parameters that can be
configured are: Desired TX Interval, Required Min RX Interval, Detection Multiplier, and system role.
These parameters are configured per interface; if a configuration change is made, the change affects all
sessions on that interface.
Caution: When configuring BFD on VLAN or LAG interfaces on the C-Series, Dell Force10 recommends
a minimum value of 500 milliseconds for both the transmit and minimum receive time, which yields a final
detection time of (500ms *3) 1500 milliseconds.
To change session parameters on an interface:
Step Task
1 Change session parameters for all
sessions on an interface.
View session parameters using the command
Disabling BFD for VLANs
If BFD is disabled on an interface, sessions on the interface are torn down. A final Admin Down control
packet is sent to all neighbors, and sessions on the remote system change to the Down state
To disable BFD on a VLAN interface:
Step Task
1 Disable all sessions on a VLAN
interface.

Configuring BFD for Port-Channels

Configuring BFD for Port-Channels is supported only on platforms
BFD on port-channels is analogous to BFD on physical ports. If no routing protocol is enabled, and a
remote system fails, the local system does not remove the connected route until the first failed attempt to
send a packet. If BFD is enabled, 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, which resides on RP2 as opposed to the other
agents which are on the line card. Therefore, the 100 total possible sessions that this agent can maintain is
shared for VLANs and port-channels.
Command Syntax
bfd interval milliseconds min_rx
milliseconds multiplier value role [active |
passive]
show bfd neighbors detail
Command Syntax
no bfd enable
Command Mode
INTERFACE VLAN
, as shown in Figure
Command Mode
INTERFACE VLAN
c e
Bidirectional Forwarding Detection (BFD) |
7-8.
(Message 3).
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