From: Bajo (bajoalex@gmail.com)
Date: Mon Jan 07 2008 - 21:07:12 ARST
Hi John,
Dotq and L2 tunnels are well documented at DoCD
If physical layout diagram is not given, you can use "sh cdp nei" to
see which ports are connected b/n the switch and router.
On 1/7/08, John <jgarrison1@austin.rr.com> wrote:
> 1. As you noted R4 has a connection through e0/0's subinterfaces to R5, SW4,
> and SW3. R4's e0/0 is one physical connection. how is it possible to have
> 3 physical connections terminate at one physical interface. I'm missing
> some logic there.(yes, I'm looking in the switching guide right now, haven't
> found it yet.)
>
> 2. Looking at the diagram and at the running configs how am I supposed to
> determine which switchports are connected to which routers? Once I've
> determined that I can config them as l3trunks. Again the only clue I get
> from the diagram is the vlan interface ID. Although I can now see that by
> IWEB's logic I can guess that for R4 it's f0/4 on SW3 and SW4 and f0/5 on
> SW4 and SW3 for R5. The solution only has one port on each switch being
> configured (I'm missing logic and it's probably the same thing thats giving
> me a headache on issue 1). There has to be a better way to determine which
> switchports I need to configure.
> ----- Original Message -----
> From: "Joseph Brunner" <joe@affirmedsystems.com>
> To: "'John'" <jgarrison1@austin.rr.com>; <ccielab@groupstudy.com>
> Sent: Monday, January 07, 2008 11:27 AM
> Subject: RE: IWEB vol4 lab 6 task 1.5 trunking
>
>
> > >How am I supposed to determine which switch interfaces to use in a
> >>situation like this and if someone can please explain how three devices
> >>each with a separate physical connection can attach to a single physical
> >>interface on another device I would appreciate it
> >
> > Looking at the diagram, its clear
> > 1. R4 & R5 are trunked to each other on vlan 45
> > 2. R5 is trunked to switch4's vlan 50 svi on vlan 50
> > 3. R5 is trunked to switch3's vlan 59 svi on vlan 59
> > 4. R4 is trunked to switch4's vlan 40 svi on vlan 40
> > 5. R4 is trunked to switch3's vlan 49 svi on vlan 49
> >
> > So yes indeed each router has 3 sub-interfaces running dot1q trunk
> > encapsulation. So you are using (and "supposed to determine")
> >
> > 1. Use any physical interface that the routers in the diagrams physically
> > are connected to
> > 2. make those interfaces dot1q trunks on the adjacent switches
> > 3. make sure the vlans in question are allowed on those trunks on switch
> > to
> > the routers "switchport trunk allowed vlan x,x,x"
> >
> > Once those vlans are active between switches 3,4 it doesn't matter which
> > interfaces on the switch fabric connect to those routers, so long as you
> > have the switch trunks, switch svi's and router sub-interfaces configured
> > it
> > will work.
> >
> > -Joe
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > John
> > Sent: Monday, January 07, 2008 11:05 AM
> > To: ccielab@groupstudy.com
> > Subject: IWEB vol4 lab 6 task 1.5 trunking
> >
> > I am tasked with configuring dot1q trunking between R4, R5, SW3, and SW4.
> > R4
> > is trunking to R5 via e0/0.45. R4 is trunking to SW3 via e0/0.49. R5 is
> > trunking to SW4 via e0/0.40. R5 is trunking to R4 via e0/1.45. R5 is
> > trunking to SW3 via e0/1.59. R5 is trunking to SW4 via e0/1.50.
> >
> > I'm having problems understanding a couple of things. first how R4 and R5
> > for example can have trunks to three different devices coming into a
> > single
> > interface. second in the diagram it has the interfaces for the trunks on
> > the
> > switches as vlan40 and vlan50 on SW4 and vlan49 on SW3. Those are not
> > physical interfaces. The solution says that I should be configuring SW2
> > f0/4
> > and SW3 f0/5. I'll assume that SW2 is supposed to be SW4 it's still short
> > one
> > trunk port.
> >
> > How am I supposed to determine which switch interfaces to use in a
> > situation
> > like this and if someone can please explain how three devices each with a
> > seperate physical connection can attatch to a single physical interface on
> > another device I would appreciate it
> >
> > thanks
> >
> > JG
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
-- Kind Regards,Bajo
This archive was generated by hypermail 2.1.4 : Fri Feb 01 2008 - 10:37:58 ARST