From: Djerk Geurts (djerk@djerk.nl)
Date: Tue Jul 31 2007 - 08:36:16 ART
It's done if nothing else is available but from experience I know that one
needs to take special care not to upset ARP caches and CAM tables. One might
have to override the bia for some SVI's.
Djerk
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> Behalf Of Carlos G Mendioroz
> Sent: dinsdag 31 juli 2007 12:50
> To: Ben
> Cc: martijn; ccielab@groupstudy.com
> Subject: Re: Bridging VLANs by looping cable
>
> Hmm, you are for a surprise if you think so.
> Yes, this works, and there are some setups where this may
> prove useful.
>
> Like some switches that only support one private vlan promiscuous port
> and you need to connect a couple.
> Or some restrictions on where you can rate limit on some
> architectures.
> (E.g. you can go to a real L3 interface from a L2 access)
>
> Nothing really clean, and I would not recomend doing that
> anywhere, but
> works... like most hacks.
>
> -Carlos
>
> Ben @ 31/07/2007 07:13 -0300 dixit:
> > Martijn,
> >
> > VLANs by design confine traffic to the vlan, unless it has
> been routed
> > across to another vlan. Merely connecting a cable between two VLANs
> > therefore does not circumvent this behavior, even if hosts
> in the two vlans
> > use the same IP subnet.
> >
> > Ben
> >
> >
> > On 7/31/07, martijn <groupstudy@martijnj.nl> wrote:
> >> Lim,
> >>
> >> i needed to laugh a little at first. Never tried.
> >>
> >> Not THE answer, I think you need to test.
> >>
> >> let's break up your q's.
> >>> done before?
> >> No.
> >>> Can a host on VLAN359 now communicate with a host on VLAN360?
> >> After i read your post trice, i see you want to do it @
> one switch. when i
> >> want to do comms with an host it starts with ip, if that
> is not local
> >> (logical AND) I go for the default gateway. Do your pc's have
> >> one?????????????
> >>
> >> When I look to your Q form another angle, say mac-addr
> table, (never
> >> tested,
> >> group?) I would say mac-addr binding goes to direct
> connected prot first,
> >> after that I assume that the link would for a L2 link
> between vlan's. Any
> >> takes?
> >>
> >> martijn
> >>
> >> ----- Original Message -----
> >> From: "Toh Soon, Lim" <tohsoon28@gmail.com>
> >> To: <ccielab@groupstudy.com>
> >> Sent: Tuesday, July 31, 2007 9:43 AM
> >> Subject: Bridging VLANs by looping cable
> >>
> >>
> >>> Hi All,
> >>>
> >>> This may sound simple and mundane but for curiosity sake,
> I need to seek
> >>> clarification.
> >>>
> >>> Has anyone tried "bridging" two VLANs by looping a cable
> to the same
> >>> switch?
> >>> E.g. in the following diagram:
> >>>
> >>> Gi0/1(VLAN359)----
> >>> |
> >>> |
> >>> Gi0/2(VLAN360)----
> >>>
> >>> The same cable connects to interfaces Gi0/1 (VLAN359) and Gi0/2
> >> (VLAN360).
> >>> Can a host on VLAN359 now communicate with a host on VLAN360?
> >>>
> >>> What's the implication doing this, e.g. from STP point of
> view? Is it
> >>> recommended at all?
> >>>
> >>> Any advice is appreciated.
> >>>
> >>>
> >>> Thank you.
> >>>
> >>> B.Rgds,
> >>> Lim TS
> >>>
> >>>
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>
> --
> Carlos G Mendioroz <tron@huapi.ba.ar> LW7 EQI Argentina
>
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