How do I remove a bridge that has an IP address that was brought up manually and isn't in /etc/network/interfaces?

$ ifconfig br100
    br100     Link encap:Ethernet  HWaddr 00:00:00:00:00:00
              inet addr:  Bcast:  Mask:

Can't delete it.

# brctl delbr br100
bridge br100 is still up; can't delete it

Can't bring it down with ifdown.

# ifdown br100
ifdown: interface br100 not configured
Best Answer

Figured it out.

# ip link set br100 down
# brctl delbr br100