Single VLAN out multiple ports on CRS?

RouterOS General
1

Is there any way to allow a VLAN to have a final egress translation out to multiple ports on a CRS125?

I’m trying to migrate a bunch of offices’ private DHCP servers (each office has their own WAN IP and private DHCP) up to a single Mikrotik device, instead of each office having DHCP on their last hop. I want a more powerful core Mikrotik device to have the individual office DHCP servers on individual VLANs.

Right now I have 6x DHCP bridges/LANs on 24 ports on a CRS (4x wired ports per DHCP), with the sfp1 port being the switched uplink. The CPU on the CRSes can’t handle gigabit speeds doing DHCP down at that level, so I need to consolidate all of the DHCPs up (6x4 per CRS,) to a master cloud core router.

I was hoping I could put the DHCP bridges up on the cloud core and then send VLANs down so that if someone plugs into ether1-ether4 of one CRS, they get DHCP1 from the master CCR, and ether5-ether8 of the same CRS they get DHCP2, but this is turning out harder to actually do than I thought.

However, it looks like the VLAN egress code only allows for one vlan per port, and not multiple ports:

/interface ethernet switch ingress-vlan-translation
add ports=ether1 customer-vid=0 new-customer-vid=55  sa-learning=yes # works
add ports=ether2 customer-vid=0 new-customer-vid=55  sa-learning=yes # error
add ports=ether3 customer-vid=0 new-customer-vid=55  sa-learning=yes # error
add ports=ether4 customer-vid=0 new-customer-vid=55  sa-learning=yes # error

/interface ethernet switch egress-vlan-tag
add tagged-ports=sfp1 vlan-id=55

/interface ethernet switch vlan
add ports=sfp1,ether1 vlan-id=55 learn=yes # works
add ports=sfp1,ether2 vlan-id=55 learn=yes # error
add ports=sfp1,ether3 vlan-id=55 learn=yes # error
add ports=sfp1,ether4 vlan-id=55 learn=yes # error

Any way around this? Or do I just have to make a VLAN551, VLAN552, VLAN553,VLAN554 that leads back to the same bridge on the uplink CCR to emulate what I’d like to get done?

2

I’m not sure why you are using vlan translation in this scenario, not the right “application” for this. You can do it two ways that I can think of off the top of my head.

  1. Set one master port for each port grouping and assign the other three ports as slaves to the master port. I’m not familiar with the CRS so I do not know if you can have multiple master ports or not.

  2. Assign vlans to each interface and ensure they have the same vlan tag. For Mikrotik, every time you assign a vlan instance to a port it must be uniquely named. You use the vlan tagging feature to ensure all of the ports are tagged with the same vlan.

example:
interface ether1 = ether1-vlan2, VLAN ID=2
interface ether2 = ether2-vlan2, VLAN ID=2
etc…