User Manual

Table Of Contents
NETGEAR M4500 Series Switches CLI Command Reference Manual 831
6.13. Black Hole Detection (BHD) Commands
In networking terms, black holes refer to the places in the Clos network where incoming or outgoing traffic is
silently discarded without informing the source that the data did not reach its intended recipient. Black hole
conditions arise when the traffic is directed towards an incorrect path in Clos networks where uRPF is not
running.
The Black Hole Detection (BHD) feature helps in getting notification logs intermittently whenever packets are
getting black-holed in the network.
6.13.1. Show commands
6.13.1.1. show bhd status
This command shows the global configuration of black hole detection feature along with the list of ports enabled
for BHD.
Format show bhd status
Default None
Mode Privileged Exec
Display Message
6.13.2. Configuration commands
6.13.2.1. bhd spine-port enable
Use this command to enable the port to be monitored for black hole detection. Only port-based routing
interface can be enabled as BHD spine ports. Alternatively, you can use no bhd spine-port enable command to
disable the port to be monitored for black hole detection.
Format bhd spine-port enable
no bhd spine-port enable
Default Disabled
Mode Interface Config
Fields
Definition
Spine port
The ports enabled for BHD
BHD Count
Displays the BHD packet counts