vlan taggging on etherchannel

Mohacsi Janos mohacsi at niif.hu
Tue Aug 21 07:34:36 PDT 2007

Hi Tom,

Thanks! Very helpful informations!

Janos Mohacsi
Network Engineer, Research Associate, Head of Network Planning and Projects
Key 70EF9882: DEC2 C685 1ED4 C95A 145F  4300 6F64 7B00 70EF 9882

On Tue, 21 Aug 2007, Tom Judge wrote:

> Mohacsi Janos wrote:
>> Dear All,
>>     What is the recommended way to configure vlan interfaces on 
>> etherchannel bonded interfaces in a failure mode. I found, that 
>> etherchannel is supported by ng_fec(4) (but not exactly what I want) and 
>> also found that there two? way of configuring vlans: vlan(4) and 
>> ng_vlan(4). But I did not found any description or configuration snippet to 
>> configure both preferentially via /etc/rc.conf neither in FreeBSD 
>> 6.x-stable, neither in FreeBSD-7.0-current. What I want to achieve:
>>   [switch1]-----GE---bge0----\    /----vlan100
>>                               }=={-----vlan101
>>   [switch2]-----FE---bge1----/    \----vlan102
>>                                    \---vlan103
>> I would like to  prefer all the vlans via bge0 with GE towards switch1. And 
>> use only bge1 in case of switch1 or bge0 link failure.
>> I could use bond on Linux for this purpose. How to achieve similar setup?
> You may want to take a look at if_lagg, it supports EtherChannel (AKA fec), 
> LACP and failover modes (Which is what you would need).  It is available in 
> RELENG_6 and Current.
> You may wish to take a look at:
> http://nzfug.nz.freebsd.org/nzfug/HandbookUpdates/NetworkAggregation
> rc.conf entries for the example might look like (not tried this):
> cloned_interfaces="lagg0"
> ifconfig_lagg0="laggproto lacp laggport fxp0 laggport fxp1"
> As for the vlan interfaces we use if_vlan and rc.conf snippets look as 
> follows:
> cloned_interfaces="vlan1 vlan2"
> ifconfig_vlan1="inet x.x.x.x/24 vlan 1 vlandev bge1"
> ifconfig_vlan2="inet x.x.x.x/24 vlan 2 vlandev bge1"
> Putting these to together for you use might look like this:
> cloned_interfaces="lagg0 vlan100 vlan101 vlan102 vlan103"
> ifconfig_lagg0="laggproto failover laggport bge0 laggport bge1"
> ifconfig_vlan100="inet x.x.x.x/24 vlan 100 vlandev lagg0"
> ifconfig_vlan101="inet x.x.x.x/24 vlan 101 vlandev lagg0"
> ifconfig_vlan102="inet x.x.x.x/24 vlan 102 vlandev lagg0"
> ifconfig_vlan103="inet x.x.x.x/24 vlan 103 vlandev lagg0"
> Tom

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