Administrator Guide

Version Description
9.10(0.1) Introduced on the S6010-ON and S4048T-ON.
9.10(0.0) Introduced on the S3148.
9.10(0.0) Introduced on the S6100-ON.
9.8(2.0) Introduced on the S3100 series.
9.8(1.0) Introduced on the Z9100–ON.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000–ON.
9.2(1.0) Introduced on the Z9500.
9.0.2.0 Introduced on the S6000.
9.0.0.0 Introduced on the Z9000.
8.3.19.0 Introduced on the S4820T.
8.3.8.0 Introduced on the S4810.
8.4.1.3 Introduced on the E-Series.
Usage
Information
When you explicitly disable a BGP neighbor for a BFD session with the neighbor bfd disable
command:
● The neighbor does not inherit the global BFD disable values configured with the bfd neighbor
command or configured for the peer group to which the neighbor belongs.
● The neighbor only inherits the global timer values configured with the bfd neighbor command:
interval, min_rx, and multiplier.
When you remove the Disabled state of a BFD for a BGP session with a specified neighbor by entering the
no neighbor bfd disable command, the BGP link with the neighbor returns to normal operation
and uses the BFD session parameters globally configured with the bfd neighbor command or
configured for the peer group to which the neighbor belongs.
show bfd neighbors
Display BFD neighbor information on all interfaces or a specified interface.
Syntax
show bfd [vrf vrf name] neighbors [interface] [detail]
Parameters
vrf vrf name (Optional) Enter the keyword vrf and then the name of the VRF to display the
BFD sessions with all neighbors within the VRF.
interface (OPTIONAL) Enter one of the following keywords and slot/port or number
information:
● For a 1-Gigabit Ethernet interface, enter the keyword GigabitEthernet then
the slot/port information.
● For a 10-Gigabit Ethernet interface, enter the keyword
TenGigabitEthernet then the slot/port information.
● For a port channel interface, enter the keywords port-channel then a
number.
● For a VLAN interface, enter the keyword vlan then a number from 1 to 4094.
detail (OPTIONAL) Enter the keyword detail to view detailed information about BFD
neighbors.
Defaults None
336 Bidirectional Forwarding Detection (BFD)