[j-nsp] VLAN tagging on fxp?

[Kristian Larsson]

On Fri, Sep 09, 2005 at 05:04:18AM +0000, Chris Morrow wrote:
> 
> 
> On Fri, 9 Sep 2005, Kristian Larsson wrote:
> 
> >>
> >>>On Thu, Sep 08, 2005 at 03:22:00PM -0400, Matt Yaklin wrote:
> >>>>
> >>>>
> >>>>On Thu, 8 Sep 2005, Kristian Larsson wrote:
> >>>>
> >>>>>I'm in an environment where I need to tag the
> >>>>>traffic to a junipers out-of-band management port.
> >>>>
> >>>>Couldn't you just create your switch port as an access port?
> >>>>As in the fxp0 does not need to be vlan aware. When it sends
> >>>>out a packet, your switch tags it. When the packet comes
> >>>>back it strips the tag.
> >>>No, unfortunately I cannot.
> >>>The switch only supports either "tagged mode" or
> >>>"port based vlans". Tagged mode configures every
> >>>port on the switch as a trunk while port based
> >>>doesn't support trunk ports but only segmentation
> >>>of the switch. And no, there is no native vlan and
> >>>no I cannot set a port to being a simple
> >>>switchport. The switch is basically braindead and
> >>>for the time being I'm stuck with it.
> >>>Right now I think the Juniper is just as braindead
> >>>as I should be able to set MTU on my mgmt
> >>>interface, right?
> 
> So, this sounds a lot like the bay switch I have :( 'port based' and 
> 'tagged' which confused the hell out of me for a long time :( I found I 
> had to put switch ports into vlans in more than one config/setup screen, 
> it was just non-intuitive :( So, does this switch ONLY do port-based for 
> ALL or can you get a trunk on 1 and port-based for the rest? perhaps it's 
> like the bay and you have to config it in 2 places to get port 1 in vlan 
> 12 and port 2 in vlan 13 and port 8 as a tagged port ?
Unfortunately this one is not like the bay or any
other switch. The port I'm connected to is tagged
end of story :(

If we just for a second pretended it was a Cisco
which made is possible to send untagged traffic,
I might still want to be able to tag my mgmt vlan,
right? And I'm able to but it's setup at 1496
bytes of MTU which is just braindead since the fxp
interfaces in FreeBSD can handle VLANs with a full
MTU of 1500 so this must be some Juniper imposed
limit.

I can probably do without the mgmt until I replace
the switch but then again that's not really what
I'm after here. There might be another time I wanna
tag my mgmt vlan, perhaps just for a temporary
setup, what do I know!?
Well, I do know that when purchasing a box that
cost more than a small car I wanna be able to tag
my mgmt vlan :)

Any Juniper folks who can comment on this?

Regards,
Kristian
> >>>
> >>>//Kristian
> >>>>Same result?
> >>>>
> >>>>i hope this helps,
> >>>>good luck
> >>>>
> >>>>m
> >>>>
> >>>>>After configuring the port I ran into some problems..
> >>>>>ssh went just fine but when trying to upload/download
> >>>>>new firmware it just stopped. Debugging turned out that
> >>>>>subinterfaces to the fxp0 interface have a MTU of 1496.
> >>>>>
> >>>>>Is it possible to change this?
> >>>>>mtu does not seem to be an option on the fxp interface!?
> >>>>>I tried setting it manually with ifconfig but to no avail
> >>>>>
> >>>>>Juniper: feature request!?
> >>>>>
> >>>>>//Kristian
> >>>>>
> >>>>>    fxp0 {
> >>>>>        vlan-tagging;
> >>>>>        unit 10 {
> >>>>>            vlan-id 10;
> >>>>>            family inet {
> >>>>>                address xx.xx.xx.xx/24;
> >>>>>            }
> >>>>>
> >>>>> Logical interface fxp0.10 (Index 67) (SNMP ifIndex 25)
> >>>>>    Flags: SNMP-Traps VLAN-Tag [ 0x8100.10 ]  Encapsulation: ENET2
> >>>>>    Bandwidth: 10mbps
> >>>>>    Input packets : 2295
> >>>>>    Output packets: 2575
> >>>>>    Protocol inet, MTU: 1496
> >>>>>
> >>>>>_______________________________________________
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> >>>>>
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> >>>
> >>
> >>--
> >>
> >>Joe McGuckin
> >>
> >>ViaNet Communications
> >>994 San Antonio Road
> >>Palo Alto, CA  94303
> >>
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> >>
> >
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