[j-nsp] Re: VLAN tagging
mark.delaney at accentuk.com
Tue Jan 18 12:03:39 EST 2005
I think you'll find on a Cisco with the config below that packets sent
on f4/0 end up being tagged on VLAN 1.
Mark Delaney, Accent UK, Network Architecture Manager
mark.delaney at accentuk.com, Tel: +44 1296 300061 / 3061, Mob: +44 7971
> -----Original Message-----
> From: juniper-nsp-bounces at puck.nether.net
> [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of
> Daniel Roesen
> Sent: 18 January 2005 16:52
> To: juniper-nsp at puck.nether.net
> Subject: [j-nsp] Re: VLAN tagging
> On Tue, Jan 18, 2005 at 04:35:42PM +1300, Thomas Salmen wrote:
> > On a Cisco router, it is possible to do this:
> > interface FastEthernet4/0
> > ip address 192.168.1.1 255.255.255.252 !
> > interface FastEthernet4/0.100
> > encapsulation dot1Q 100
> > ip address 10.100.100.1 255.255.255.252 !
> > interface FastEthernet4/0.200
> > encapsulation dot1Q 200
> > ip address 10.200.200.1 255.255.255.252
> > That is, add VLAN-tagged logical subinterfaces to a non-tagged
> > physical interface.
> > Does anyone know if this can be duplicated on an M-series?
> No, impossible. An ethernet interface with enabled
> vlan-tagging does tag each and every VLAN. You can't send
> untagged frames with that.
> You'll need to adapt your trunk to tag anything. JunOS has no
> concept of "native" (untagged) VLAN.
> Best regards,
> CLUE-RIPE -- Jabber: dr at cluenet.de -- dr at IRCnet -- PGP:
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