From: Michael Zuo (mzuo@ixiacom.com)
Date: Thu Nov 16 2006 - 02:21:20 ART
SW1 is vtp server for domain CISCO-A and SW2 is vtp client for domain
CISCO-A (they are in different domain from SW3 and 4)...
-----Original Message-----
From: Tony Schaffran [mailto:groupstudy@cconlinelabs.com]
Sent: Wednesday, November 15, 2006 9:15 PM
To: Michael Zuo; ccielab@groupstudy.com
Subject: RE: VTP issue with IEWB-RS version 4 sample lab
How are SW1 and SW2 configured with regards to
Server/Client/Transparent?
Tony Schaffran
Network Analyst
CCIE #11071
CCNP, CCNA, CCDA,
NNCDS, NNCSS, CNE, MCSE
www.cconlinelabs.com
Your #1 choice for online Cisco rack rentals.
-----Original Message-----
From: Michael Zuo [mailto:mzuo@ixiacom.com]
Sent: Wednesday, November 15, 2006 9:08 PM
To: groupstudy@cconlinelabs.com; ccielab@groupstudy.com
Subject: RE: VTP issue with IEWB-RS version 4 sample lab
Hi there,
Thanks for the reply. The VTP configuration is actually very straight
forward and not much can go wrong:
SW3 (simulated with NM-16ESW via Dynagen)
(vlan)#Vtp server
(vlan)#vtp domain CISCO-B
SW4 (simulated with NM-16ESW via Dynagen)
(vlan)#Vtp client
(vlan)#vtp domain CISCO-B
The problem is that the trunk topology is SW1-SW2, SW1-SW4, SW2-SW3,
SW3-SW4, this forms a loop which means one trunk link has to be shut
down...). if STP shuts down trunk SW3-SW4, VTP will not propagate, if
STP shuts down another link, at least one VLAN loses connectivity to all
the switches that it is on...
The scenario is actually quite complex, my description is the "summary",
more details at:
http://www.internetworkexpert.com/downloads/iewb-rs.sample.lab.pdf
thanks
-----Original Message-----
From: Tony Schaffran [mailto:groupstudy@cconlinelabs.com]
Sent: Wednesday, November 15, 2006 6:23 PM
To: Michael Zuo; ccielab@groupstudy.com
Subject: RE: VTP issue with IEWB-RS version 4 sample lab
Spanning Tree should not affect VTP if it is setup properly.
How are your switches setup with regards to Server/Client/Transparent?
Have you configured domain names and/or passwords?
If you can post your VTP configs, we may be able to help more.
Tony Schaffran
Network Analyst
CCIE #11071
CCNP, CCNA, CCDA,
NNCDS, NNCSS, CNE, MCSE
www.cconlinelabs.com
Your #1 choice for online Cisco rack rentals.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Michael Zuo
Sent: Wednesday, November 15, 2006 6:02 PM
To: ccielab@groupstudy.com
Subject: VTP issue with IEWB-RS version 4 sample lab
Hi Group,
I ran into an issue with the new sample lab with 4 switches and am
wondering if someone else has seen it or I've made a mistake somewhere:
For the switching part, when all the trunk ports are set up, the links
between SW3 and SW4 (port 19, 20) will go into blocking because spanning
tree and trunk exists between SW1/SW2, SW1/SW4 and SW2/SW3. this means
VTP will not work between SW3 and SW4 even though it is part of the
requirement of section 1.1
The catch is that even by adjusting port-priority and port-cost to make
the trunks between SW3 and SW4 come up, it will bring down trunk links
between another pair of switches. Because of the way the requirements
are set up (only vlan 102 can traverse between SW1 and SW4), no other
trunk links can be brought down without losing connectivity for at least
one vlan.
The only solution I can see is PVST which is not part of the solution.
Am I missing something very simple or maybe there is another workaround?
Please comment....
Thanks a lot...
This archive was generated by hypermail 2.1.4 : Fri Dec 01 2006 - 08:05:47 ART