From: Joseph Brunner (joe@affirmedsystems.com)
Date: Thu Jul 10 2008 - 01:50:04 ART
There was an IEWB VOL 2 lab 9 had this challenge and I suggest you check it,
or the ie forums if you don't have the wb.
Are you using this workbook? It was pretty clear when you work though your
L2 diagram which vlans should go where.
I don't trust vlan pruning as it's prone to failure...
One thing to watch for; if your router's rely on vlans for communication
between them, you have HAVE to create the vlans needed by the router to
router topology on the switches in the middle.
If you ARE NOT allowed to create the vlans (i.e. "VLAN 5, 10, 15 should not
exist on SW2") then you obviously can use dot1qtunneling to get the vlans
across the middle switch where you can technically create them. There I just
gave you one thing that is going in my soup to salami workbook.
-Joe
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Huan
Pham
Sent: Thursday, July 10, 2008 12:24 AM
To: ccielab@groupstudy.com
Subject: Creating minimum VLANs to accomplish reachablility
Hi GS,
If we have 4 switches. SW1 is in the centre. SW2,3,4 form trunks with
SW1 only. SW1 is in transpearent mode. The other switches could be in
Client/Server or transpearent (which does not really matter!). Each of 4
switches have devices belonging to some set of VLANs.
Question:
Create minimum number of VLANs on SW1 to have LAN reachbility for all
VLAN.
How we should address this question?
My approach is:
- Draw L2 diagram, showing VLAN end points (e.g. routers, or VLAN
interfaces) that directly connected to each switch.
- Create VLANs that directly attaches to SW1 (induding VLAN for access
interfaces, as well as VLAN interfaces)
- Identify VLAN that transit SW1. Create these VLANs on SW1.
- Verify LAN reachability, by doing ping tests on each VLAN segments.
This process is time-consumming for me. Is there any better approach? I
heard people have shortcuts, something like temporarily turning SW1 into
a VTP client, and enable VTP prunning. I am not sure exact method
though.
Appreciate if you guys can share tips and trick for this task.
Cheers,
Huan
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