Bridge Commands

Here is a list of some of the common bridge commands that you may want to use.  Examples are included so you can see what they actually will do.

Lesson 8 / Lesson 10

The "#" sign indicates that you need to run the command as root.  You need to start each command with "brctl" and indicate the bridge you are referring to.

# brctl

Bridge firewalling registered

commands:

addbr           <bridge>                add bridge

# brctl addbr br0

addif           <bridge> <device>       add interface to bridge

# brctl addif br0 eth0
# brctl addif br0 eth1

delbr           <bridge>                delete bridge

delif           <bridge> <device>       delete interface from bridge

show                                    show a list of bridges

showmacs        <bridge>                show a list of mac addrs

# brctl showmacs br0
port no    mac addr        is local?    ageing timer
1    00:01:6b:db:ca:d2    no           0.09
2    00:12:bf:7f:59:b1    no           8.54
1    00:30:1d:a5:ae:39    yes           0.00
2    00:32:18:a5:ae:3a    yes           0.00
2    00:30:48:6e:d6:b0    no           5.95


showstp         <bridge>                show bridge stp info

# brctl showstp br0
br0
bridge id        8000.003018b5ae39
designated root    8000.003018b5ae39
root port           0            path cost           0
max age          20.00            bridge max age          20.00
hello time           2.00            bridge hello time       2.00
forward delay          15.00            bridge forward delay      15.00
ageing time         300.01
hello timer           1.76            tcn timer           0.00
topology change timer       0.00            gc timer           1.76
flags           


eth1 (1)
port id        8001            state             forwarding
designated root    8000.003018b5ae39    path cost          19
designated bridge    8000.003018b5ae39    message age timer       0.00
designated port    8001            forward delay timer       0.00
designated cost       0            hold timer           0.76
flags           

eth2 (2)
port id        8002            state             forwarding
designated root    8000.003018b5ae39    path cost          19
designated bridge    8000.003018b5ae39    message age timer       0.00
designated port    8002            forward delay timer       0.00
designated cost       0            hold timer           0.76
flags           


setageing       <bridge> <time>         set ageing time

setbridgeprio   <bridge> <prio>         set bridge priority

setfd           <bridge> <time>         set bridge forward delay

setgcint        <bridge> <time>         set garbage collection interval

sethello        <bridge> <time>         set hello time

setmaxage       <bridge> <time>         set max message age

setpathcost     <bridge> <port> <cost>  set path cost

setportprio     <bridge> <port> <prio>  set port priority

stp             <bridge> <state>        turn stp on/off

# brctl stp br0 off

Copyright CyberMontana Inc. and BeginLinux.com
All rights reserved. Cannot be reproduced without written permission. Box 1262 Trout Creek, MT 59874