[f-nsp] Multiple subnets on same VLAN

[Wilbur Smith]

Jose,

This is pretty easy on the MLX. This is also referred to as “Super Netting”.

The trick is to create two separate VE interfaces, one for each subnet’s default gateway, then assign both VE interfaces to the same VLAN. You will need to create the VE first before adding it to the MLX’s VLAN.

Config would look something like:

Interface ve 100
Ip address 10.0.1.100

Interface ve 101
Ip address 10.0.1.101

Vlan 100
Router-interface
Ve 100
Ve 101

Apologies for not being able to confirm the exact syntax; don’t have access to a router right now.

Wilbur

From: Charles Monson <monson at wins.net<mailto:monson at wins.net>>
Date: Wednesday, November 12, 2014 at 6:15 AM
To: "foundry-nsp at puck.nether.net<mailto:foundry-nsp at puck.nether.net>" <foundry-nsp at puck.nether.net<mailto:foundry-nsp at puck.nether.net>>
Subject: Re: [f-nsp] Multiple subnets on same VLAN

Do you have “no route-only” on the physical interface(s)? I’ve had trouble with routing between multiple subnets on  a router-interface once and things started behaving normally after changing that.

- Charles

From: foundry-nsp [mailto:foundry-nsp-bounces at puck.nether.net] On Behalf Of José Santos
Sent: Tuesday, November 11, 2014 6:53 PM
To: foundry-nsp at puck.nether.net<mailto:foundry-nsp at puck.nether.net>
Subject: [f-nsp] Multiple subnets on same VLAN

Hi,
I'm needing to merge two subnets that were before in two diferent VLANs in the same VLAN (attached to one untagged ethernet port) in a MLX router.

I configured multiple IP subnets in the same router-interface and I'm experiencing a lot of network issues. I am now trying to configure the subnets, let's say 192.168.50.1/24<http://192.168.50.1/24>, 192.168.51.1/24<http://192.168.51.1/24> and 192.168.52.1/24<http://192.168.52.1/24> in distinct virtual interfaces belonging to the same VLAN, however I am not being able to accomplish this since only one router-interface is allowed.

I thought configuring them in different loopback ports and then configure multiple unnumered interfaces or trunk various VLANs but none of this ideas seem possible as well.
Anyone knows how can I accomplish this and can provide a brief config example?
Thank you in advance!

--
Best Regards,
José
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