Filter
Top Products
200 | Bidirectional Forwarding Detection
www.dell.com | support.dell.com
Figure 9-26. Viewing Established Sessions for VLAN Neighbors
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.
To change session parameters on an interface:
View session parameters using the command
show bfd neighbors detail, as shown in Figure 9-8 on
page 179.
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 (Message 3 on
page 179).
To disable BFD on a VLAN 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.
Step Task Command Syntax Command Mode
1 Change session parameters for all
sessions on an interface.
bfd interval milliseconds min_rx milliseconds
multiplier value role
[active | passive]
INTERFACE VLAN
Step Task Command Syntax Command Mode
1 Disable all sessions on a VLAN
interface.
no bfd enable
INTERFACE VLAN
R2(conf-if-vl-200)#bfd neighbor 2.2.3.2
R2(conf-if-vl-200)#do show bfd neighbors
* - 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
* 2.2.3.2 2.2.3.1 Vl 200 Up 100 100 3 C
VLAN BFD Sessions Enabled