set PROMISC mode for switch in Linux

Question

How do I set the promisc mode on for a switch. I have two SW like below:

root@chandler:~# brctl show
bridge name     bridge id               STP enabled     interfaces
br0             8000.622c9e9e5b84       no              veth2
br1             8000.5275171ffe82       no              veth20
                                                    veth21
                                                    veth30
                                                    veth31

But I don't know how to put them in promisc mode:

root@chandler:~# ip link show br0
144: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
link/ether 62:2c:9e:9e:5b:84 brd ff:ff:ff:ff:ff:ff

What is the command for that, and should it be executed for the interface(s)?

Solution

In a Linux based switching device, do the following on the interfaces:

ifconfig [interface] promisc

From the man pages:

[-]promisc : Enable or disable the promiscuous mode of the interface. If selected, all packets on the network will be received by the interface.

Comments

[David Schwartz]

I can't figure out what it would mean for a bridge to be in promiscuous mode. Promiscuous mode is about how you handle packets not sent to your hardware address and a bridge doesn't have a hardware address.