[j-nsp] EX4200/EX4550 VLAN translation

[Jed Laundry]

Hi Mike,

On an EX4550 running 14.1x53, I have a trunk interface with VLAN
translation as per below.

Three hints:

- you have to specify all the membership config under the vlan stanzas, you
can't have anything in the aeX.0 vlan members
- in 12.2, if you swapped a single VLAN on a trunk, you had to swap them
all. I never re-tested if this was resolved.
- I'm running 14.1 because I found a bug in 15.1 and later 12.3 releases
that prevented ARP replies on swapped VLANs from reaching an IRB interface
(PR1342432). This was resolved in 15.1R7, but I haven't had time to test
that release yet.

    interfaces {
        ae0 {
            unit 0 {
                family ethernet-switching;
            }
        }
    }

    vlans {
        vlan-lan {
            vlan-id 100;
            interface {
                ae0.0 {
                    mapping {
                        200 {
                            swap;
                        }
                    }
                }
            }
        }
    }

Thanks,
Jed.


On Sat, 7 Jul 2018 at 01:51 Mike Williams <mike.williams at comodo.com> wrote:

> Hey all,
>
> So this is a new thing, to us at least.
> We've got a need to transport some VLANs across a switch, without the
> intermediary seeing them, and we're confused.
> I was hoping someone could show us the light.
>
> We have 3 EX VCs
> VC1 2xEX4200
> VC2 2xEX4200+2xEX4550
> VC3 2xEX4550
> where VC1 is connected to the EX4200s of VC2, and the EX4550s of VC2 are
> connected to VC3.
> VC2 to VC3 is already carrying tagged VLANs.
> We need to get VLANs 128-137 from VC1 to VC3.
> VC2 is already using VLANs in that range so we can't simply switch them
> across.
>
> I know about .1q tunnelling, what I don't know is how to remove the S-VLAN.
> pop isn't an option in "vlans <blah> interface <foo> <int> mapping", and
> JUNOS
> doesn't want to accept swap on a trunk interface (VC2 to VC3 is a trunk
> port).
>
> Help?
>
>
> Thanks
>
> --
> Mike Williams
>
>
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