[f-nsp] Multiple subnets on same VLAN

[José Santos]

Thank you all for your input.

I have the multiple subnets configured in the same ve interface. The issues
we were experiencing were lost TCP packets, low tranfer rates, stalled
downloads ...

Example of config:
interface ve 11
 ip address 192.168.10.1/28
 ip address 192.168.10.129/28
 ip address 192.168.11.1/25
 ip address 192.168.11.129/26
!

After a lot of digging we concluded the issues were not related with this
change, but with trafic fragmentation that is ocurring in a GRE tunnel we
had setup at the same time.

One issue we still see is when we do a traceroute let's say from
192.168.11.2/25 to the outside, the router/gateway IP we see in the first
hop is ip address 192.168.10.1 instead of 192.168.11.1. However, this
doesn't seem to affect the traffic.

Thanks again,
José

On 14 November 2014 08:50, Jethro R Binks <jethro.binks at strath.ac.uk> wrote:

> In the past, we've simply done this (usually in the context off adding
> another IP subnet into a VLAN, but probably also when merging two VLANs
> with subnets too):
>
> vlan 24
>  ta e 1/1
>  router-interface ve 24
>
> interface ve 24
>  ip address 10.0.1.100/24
>  ip address 10.0.2.100/24
>
> Alternatively, in some cases I also have this sort of thing (ancient
> BigIron config):
>
> vlan 2
>  ta e 1/1 to 1/3
>  ip-subnet 10.0.1.0 255.255.255.0 name S1
>    static e 1/1 to 1/2
>    router-int ve 2
>  ip-subnet 10.0.2.0 255.255.255.0 name S2
>    static e 1/1 to 1/3
>    router-int ve 3
>
> int ve 2
>   ip address 10.0.1.100 255.255.255.0
>
> int ve 3
>   ip address 10.0.2.100 255.255.255.0
>
> I can't really remember much about it now :)
>
> I'm not familiar with the trick just below.
>
> Jethro.
>
>
> On Thu, 13 Nov 2014, Wilbur Smith wrote:
>
> > 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
> >
>
> .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .
> Jethro R Binks, Network Manager,
> Information Services Directorate, University Of Strathclyde, Glasgow, UK
>
> The University of Strathclyde is a charitable body, registered in
> Scotland, number SC015263.
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