Dell Force10 Z9000 - Page 157

Bidirectional Forwarding Detection (BFD) | 157
Figure 7-28. Viewing Established Sessions for VLAN Neighbors
Changing port-channel 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 you change a parameter, the change affects all sessions on
that interface.
To change session parameters on an interface:
View session parameters using the command
show bfd neighbors detail, as shown in Figure 7-8.
Disabling BFD for port-channels
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 are placed in a Down state (Message 3).
To disable BFD for a port-channel:
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.
Step Task Command Syntax Command Mode
1 Change session parameters for all
sessions on a port-channel interface.
bfd interval milliseconds min_rx
milliseconds multiplier value role [active |
passive]
INTERFACE
PORT-CHANNEL
Step Task Command Syntax Command Mode
1 Disable BFD for a port-channel. no bfd enable INTERFACE PORT-CHANNEL
R2(conf-if-po-1)#bfd neighbors 2.2.2.1
R2(conf-if-po-1)#do show bfd neighors
* - Active session role
Ad Dn - Admin Down
C - CLI
I - ISIS
O - OSPF
R - Static Route (RTM)
V - VRRP
LocalAddr RemoteAddr Interface State Rx-int Tx-int Mult Clients
* 2.2.2.2 2.2.2.1 Po 1 Up 100 100 3 C
Port-channel BFD Sessions