Brctl command
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=Introduction= | =Introduction= | ||
BRCTL is used to create a bridge between two interfaces. To view the current bridges, the following syntax can be used | BRCTL is used to create a bridge between two interfaces. To view the current bridges, the following syntax can be used | ||
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Description created by Ustler | Description created by Ustler | ||
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+ | http://www.tinc-vpn.org/examples/bridging | ||
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+ | http://linuxcommand.org/man_pages/brctl8.html | ||
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+ | '''You are here: ''' '''[[Main Page]]'''/'''[[DD-WRT Docu (EN)]]'''/'''[[Telnet/SSH and the Command Line]]'''/'''[[brctl command]]''' |
Revision as of 22:41, 18 February 2006
You are here: Main Page/DD-WRT Docu (EN)/Telnet/SSH and the Command Line/brctl command
Introduction
BRCTL is used to create a bridge between two interfaces. To view the current bridges, the following syntax can be used
brctl show
Using this command, a bridge name (Often br0 or br1), bridge ID (Used to uniquely specify the bridge), and the current settings for STP (Spanning Tree Protocol) are displayed. The output wil be formated similar to this:
bridge name bridge id STP enabled br0 8000.001217318d3e yes
Bridges can easily be added using
brctl addbr <name>
Where name is the user specified name of the bridge. To delete a bridge, one would use
brctl delbr <name>
Althought these commands simply create an instance of a bridge, in order to use them, one must add interfaces to a bridge. The bride "br0" is standard on DD-WRT. In order to show the current interfaces that are members of a bridge, we use a command similar to the "show" command:
brctl showbr br0
This would generate output similar to the following:
br0
bridge id 8000.001217318d3e designated root 8000.001217318d3e 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 0.00 bridge forward delay 0.00 ageing time 42.30 gc interval 4.00 hello timer 1.28 tcn timer 0.00 topology change timer 0.00 gc timer 2.02 flags
vlan0 (1)
port id 8001 state forwarding designated root 8000.001217318d3e path cost 100 designated bridge 8000.001217318d3e message age timer 0.00 designated port 8001 forward delay timer 0.00 designated cost 0 hold timer 0.00 flags
eth1 (2)
port id 8002 state forwarding designated root 8000.001217318d3e path cost 100 designated bridge 8000.001217318d3e message age timer 0.00 designated port 8002 forward delay timer 0.00 designated cost 0 hold timer 0.00 flags
Here we can see that the bridge contains two members, eth0 and vlan0.
To add a interface to a bridge, the command syntax is
brctl addif <brname> <ifname>
Where brname is the existing bridge name, and ifname is the interface you want to add.
To remove a interface from a bridge, the syntax is very similar
brctl delif <brname> <ifname>
Their are a few other features that brctl offers, but they are beyond the scope of this page. In order to get a better understanding of them, i would suggest you read the man page for brctl located at http://linuxcommand.org/man_pages/brctl8.html . One KEY thing to note is that the brctl commands slightly differ from the man page. Especially the "show" command. The documentation that i suggested recommends "brctl show <brname>" but in dd-wrt, the proper syntax is "brctl showbr <brname>". If you have any doubts, simply type "brctl" and a list of avaliable commands will be displayed.
Description created by Ustler
External Links
http://www.tinc-vpn.org/examples/bridging
http://linuxcommand.org/man_pages/brctl8.html
You are here: Main Page/DD-WRT Docu (EN)/Telnet/SSH and the Command Line/brctl command