[j-nsp] vlan-id 0

[masood at nexlinx.net.pk]

Some attached devices may not accept 802.1q-tagged frames, and therefore
can reside only in VLAN 0.
Conversely, some devices may accept only tagged frames, requiring that
even frames in VLAN 0 be tagged. So JUNOS is providing you the way to deal
with such boxs.. :D

The range for valid VLAN IDs on Cisco kit is 1 to 4094 with VLAN 1 being
the default VLAN. I suspect VLAN 1 might be what you are talking about
when they refer to VLAN 0.
However, to muddy the water, Cisco's documentation for the 3750 reveals
that there IS a VLAN 0 - but only when you're using VOIP

Regards,
Masood
Blog: http://weblogs.com.pk/jahil/


> Experts,
> do you know what is the meaning of vlan-id 0?
> According to: http://en.wikipedia.org/wiki/IEEE_802.1Q
> "VLAN Identifier (VID): a 12-bit field specifying the VLAN to which the
> frame belongs. A value of 0 means that the frame doesn't belong to any
> VLAN; in this case the 802.1Q tag specifies only a priority and is
> referred to as a priority tag"
>
> How would I match this Juniper config:
>
> show configuration interfaces ge-0/0/0
> vlan-tagging;
> unit 0 {
>     vlan-id 0;
>     family inet {
>         address 1.1.1.1/30;
>     }
> }
>
> on a cisco device on the other end of the cable where vlan starts from
> 1?
>
> r2(config-subif)#encapsulation dot1Q ?
>   <1-4094>  IEEE 802.1Q VLAN ID required
>
> Thanks,
> bit
>
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