Cisco Catalyst 4500 series Administration Manual page 941

Chapter 39 Configuring Bidirection Forwarding Detection
172.16.1.2
Session state is UP and not using echo function.
Local Diag: 0, Demand mode: 0, Poll bit: 0
MinTxInt: 50000, MinRxInt: 50000, Multiplier: 3
Received MinRxInt: 50000, Received Multiplier: 3
Holdown (hits): 150(0), Hello (hits): 50(5735)
Rx Count: 5731, Rx Interval (ms) min/max/avg: 32/72/49 last: 32 ms ago
Tx Count: 5740, Tx Interval (ms) min/max/avg: 40/64/50 last: 44 ms ago
Registered protocols: EIGRP
Uptime: 00:04:45
Last packet: Version: 0
Figure 39-4
interface 6/1 on SwitchB is shut down, the BFD values of the corresponding BFD sessions on SwitchA
and SwitchB are reduced.
Figure 39-4
When Gigabit Ethernet interface 6/1 on SwitchB fails, BFD will no longer detect SwitchB as a BFD
neighbor for SwitchA or for SwitchC. In this example, Gigabit Ethernet interface 6/1 has been
administratively shut down on SwitchB.
The following output from the show bfd neighbors command on SwitchA now shows only one BFD
neighbor for SwitchA in the EIGRP network. The relevant command output is shown in bold.
SwitchA# show bfd neighbors
OurAddr
172.16.1.1
The following output from the show bfd neighbors command on SwitchC also now shows only one BFD
neighbor for SwitchC in the EIGRP network. The relevant command output is shown in bold.
SwitchC# show bfd neighbors
OurAddr
172.16.1.3
OL_28731-01
172.16.1.3 3/6
I Hear You bit: 1
Poll bit: 0
Multiplier: 3
My Discr.: 6
Min tx interval: 50000
Min Echo interval: 0
shows that Gigabit Ethernet interface 6/1 on SwitchB has failed. When Gigabit Ethernet
Gigabit Ethernet Interface 6/1 Failure
RouterB
172.16.1.2
172.16.1.1
GigabitEthernet 6/1
RouterA
NeighAddr LD/RD
172.16.1.3 5/3
NeighAddr LD/RD RH
172.16.1.1 3/5
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)SG
Configuration Examples for Bidirectional Forwarding Detection
1(RH) 118 (3 )
- Diagnostic: 0
- Demand bit: 0
- Final bit: 0
- Length: 24
- Your Discr.: 3
- Min rx interval: 50000
Gigabit Ethernet 6/1
icon indicating a failure
172.16.1.3
GigabitEthernet 6/1
RH/RS Holdown(mult)
1(RH) 134 (3 )
Holdown(mult) State
1 114 (3 ) Up
Up Gi6/1
RouterC
State Int
Up Gi6/1
Int
Gi6/1
39-21