VLAN trunking and fragmentation

[Brooks Davis]

On Thu, Mar 13, 2008 at 11:13:14AM +1300, Andrew Thompson wrote:
> On Wed, Mar 12, 2008 at 12:38:06PM -0700, Sean Chittenden wrote:
> >> interface ethernet 1/g1
> >> switchport mode trunk
> >> switchport trunk allowed vlan add 10
> >> exit
> >
> > I think this is an issue with default VLAN membership.  I have this config 
> > running on *hundreds* of servers without issue.  Since Dell should be a 
> > cisco rip-off, on your switchport config, throw in (haven't tested this, on 
> > dell's CLI):
> >
> >  switchport trunk encapsulation dot1q
> >
> > then change your ifconfig foo to:
> >
> > cloned_interfaces="vlan10 vlan11"
> > ifconfig_re0="media 100baseTX mediaopt full-duplex"
> > ifconfig_vlan10="vlan 10 vlandev re0"
> > ifconfig_vlan10_alias0="inet 192.168.60.1 netmask 255.255.255.0"
> > ifconfig_vlan11="vlan 11 valndev re0"
> > ifconfig_vlan11_alias0="inet 192.168.100.1 netmask 255.255.255.0"
> >
> > FWIW, I think you'll find fewer gray hairs if you stick to the convention 
> > of using a vlan device that has the same VLAN tag.  You may be able to have 
> > a default VLAN, but I consider it poor practice to rely on default VLAN 
> > membership.
> 
> Even nicer is using <interface>.<number> autoconfig, the following is
> equivalent to above:
> 
> cloned_interfaces="re0.10 re0.11"
> ifconfig_re0="media 100baseTX mediaopt full-duplex"
> ifconfig_re0.10="inet 192.168.60.1 netmask 255.255.255.0"
> ifconfig_re0.11="inet 192.168.100.1 netmask 255.255.255.0"

One small nit. The '.' isn't valid in variable names so the ifconfig_re0.xx
lines need to turn into ifconfig_re0_xx (we compress ./-+ to _).

-- Brooks
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