Creating minimum VLANs to accomplish reachablility

From: Huan Pham (Huan.Pham@peopletelecom.com.au)
Date: Thu Jul 10 2008 - 01:24:17 ART


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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