From: Jaeheon Yoo (kghost@xxxxxxxxxxxx)
Date: Thu Mar 07 2002 - 20:49:03 GMT-3
Hi, John
I don't think we can use subinterfaces on a regular ethernet interface,
First of all, we have no differentiation between two.
We know this is possible for IPX, but only if they are using different encapsul
ations.
Without isl or dot1q, I guess it's not possible, even if possible, it's useless
.
Jaeheon
Well, I actually tried it :)
Rack02R1(config)#int e0.1
Rack02R1(config-subif)#ip addr 150.24.3.2 255.255.255.0
Configuring IP routing on a LAN subinterface is only allowed if that
subinterface is already configured as part of an IEEE 802.10, IEEE 802.1Q, or I
SL vLAN.
Rack02R1(config-subif)#
----- Original Message -----
From: "John Neiberger" <neiby@ureach.com>
To: "George Hansen" <HansenG@radiological.com>; <ccielab@groupstudy.com>
Sent: Friday, March 08, 2002 7:24 AM
Subject: Re: Router on a stick puzzle
> For the first part I'm guessing that you used a secondary IP
> address. Can you use subinterfaces on a regular ethernet
> interface? Hmm.... that might also be a solution. I've never
> tried it.
>
> Assuming you're using secondary addressing, will the router at
> least advertise both prefixes? Is the problem that the router
> only uses the primary IP address to source routing updates but
> you have routers that reside in both networks hanging off of
> that interface?
>
> Okay.... use RIP, and on the other routers add 'no validate-
> update-source' to the RIP config. Since the updates are
> broadcast (or multicast) this might allow them to at least get
> updates that point back to the originating router.
>
> This is interesting. Let us know what you find out!
>
> John
>
> ---- On Thu, 07 Mar 2002, George Hansen
> (HansenG@radiological.com) wrote:
>
> > Here's a puzzle I came across in a production network:
> >
> > 1) Using one Ethernet port, configure a router to route
> between network
> > 10.1.0.0/16 and network 10.27.0.0/16. Both networks exist on
> the same
> > LAN. VLAN trunking is not allowed. One static route is
> allowed.
> >
> > 2) Advertise a route to 10.27.0.0 to network 10.1.0.0 using
> RIP or
> > EIGRP.
> >
> > I've gotten part 1 to work, but haven't gotten part 2 yet.
> >
> > George Hansen, CCIE # 8546
> >
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