[ixpmanager] IXPManager: Two customers on one port

Thu Apr 23 13:50:48 IST 2026

Hello,
Thank you for your help. Unfortunately, this does not seem to solve my problem, so I’ll try to explain it in more detail.

IXP1: This is our IXP
IXP2: A different IXP in a different physical location
IXP3: A different IXP in a different physical location
IXP4: A different IXP in a different physical location

We have Layer‑2 transport to all other IXPs, allowing us to carry their peering LANs and, in turn, provide ours to them. At the moment, only one of these IXPs has more than one customer; this is the reason for my request regarding “one port with two customers,” although in theory there could be more than two.
The second issue is the following: if customers on our IXP want to connect to one of the other IXPs (IXP2, IXP3, IXP4), I need to configure the corresponding VLANs for those IXPs on the customer-facing port.
We configure our switches manually, so there is no need for templates on the IXP Manager side. However, I would like to achieve the following:

  *   Each customer should only see their own traffic on the port connected to our IXP.
  *   A correct and clean way to model the VLANs of the other IXPs in IXP Manager, without breaking the automatic Route Server or Nagios configuration.

I hope this clarifies the situation and that there is a suitable solution.
Thank you in advance for your time and help.
Best regards,

Roland Christanell

From: ixpmanager <ixpmanager-bounces at inex.ie> On Behalf Of Barry O'Donovan (INEX) via ixpmanager
Sent: Dienstag, 21. April 2026 17:56
To: INEX IXP Manager Users Mailing List <ixpmanager at inex.ie>
Cc: Barry O'Donovan (INEX) <barry.odonovan at inex.ie>
Subject: Re: [ixpmanager] IXPManager: Two customers on one port

Hi Roland,

Yes, this is the perfect place for such questions!

As Chris says, you can use subinterfaces, which are supported by IXP Manager, at least certainly the type that creates what appears via snmp as a standard interface, like Arista’s implementation.  Sample config below, but it needs a specific tcam profile, which you’d be best to get from your Arista support team, as any other config/services you have defined would need to be considered.

The other, less technical way, is to use fanout ports. This means you burn a port for the uplink and then two ports for each member delivered via that uplink. See the docs for this at https://docs.ixpmanager.org/latest/features/reseller/.

 - Barry

Sample Arista Config

vlan 10
   name peeringlan

interface Ethernet25
   description Reseller: Acme Ltd
   load-interval 30
   no switchport
   no lldp transmit
   no lldp receive
   no sflow enable

interface Ethernet25.2001
   description Cust: Resold Customer 1 Ltd
   load-interval 30
   encapsulation dot1q vlan 2001
   vlan id 10
   mac access-group l2acl-ixp-resold-cust in
   service-policy type qos input pm-subinterface-1g
   shape rate 1000000

interface Ethernet25.2002
   description Cust: Resold Customer 2 Ltd
   load-interval 30
   encapsulation dot1q vlan 2002
   vlan id 10
   ...

On 21/04/2026 14:37:23, "Christopher Rössler via ixpmanager" <ixpmanager at inex.ie<mailto:ixpmanager at inex.ie>> wrote:

Hi,
Have you thought about using a reseller uplink interface for the "other IXP" and putting the actual customers into resold subinterfaces?

Kind regards,

chris

On Tue, Apr 21, 2026 at 3:04 PM Roland Christanell | Telmekom via ixpmanager <ixpmanager at inex.ie<mailto:ixpmanager at inex.ie>> wrote:
Hello,

I hope this is the right place to ask this question.
I am using IXP Manager v7.1.0 and have 2 customers that are connected on one port, the reason is that this is some kind for “transport” from another IXP and therefore multiple customers can be connected on one port.
Currently only one member has the actual port assigned and this leads to the problem, that for the second one I have traffic graph and the traffic off both is seen on the graph of the first member.

Best regards,

Roland Christanell
Network Engineer

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Christopher Rössler, Network Engineer
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Kind regards,
Barry O'Donovan
INEX Operations

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