From: Joseph Brunner (joe@affirmedsystems.com)
Date: Mon Jan 07 2008 - 15:27:41 ARST
>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
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