From: Joseph Brunner (joe@affirmedsystems.com)
Date: Sun Aug 26 2007 - 19:35:30 ART
Because they are asking you to make the logical topology do one thing,
(two DIRECT links between Sw3 & Sw4 using the stated ports), when in the
physical topology those ports are indeed going to SW1.
So SW1 must be INVISIBLE between SW3 & 4 on this L3 ether-channel link.
>I was able to get this working simply with the l2protocol tunnel
>command on the middle switch with the ports in access mode.
Read the task again, Look at where they say "if an additional VLAN is needed
use VLAN 100"... This should give you the hint you need to approach this
task - Dot1q-tunnel mode on SW1, the intermediary...
Look at the solution where they use VLAN 100 + VLAN 101 as each
"link" between SW3 and SW4 needs an intermediary vlan to tunnel the
etherchannel on. I tried this task without making two vlans and the channel
didn't work properly. Originally, I just tried to use VLAN 100 on all 4
ports of SW1. I realized the channeling was getting confused and it was
looping traffic. I created a second vlan (like they did, 101) and the
channel did come up fine.
With your solution, what was your verification you had completed the task?
Did you verify on SW3 & SW4 "show etherchannel summary" ?
Did you verify on SW1 "show interface switch | beg 0/17 ?
Did you verify on SW1 "show interface switch | beg 0/18 ?
Did you verify on SW1 "show interface switch | beg 0/20 ?
Did you verify on SW1 "show interface switch | beg 0/21 ?
-Joe
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Gregory Gombas
Sent: Sunday, August 26, 2007 5:38 PM
To: Cisco certification
Subject: IE Lab9 Task 1.7 L2 Tunnel
The task requires you to connect two switches via a layer 3
etherchannel by tunneling through another switch in the middle.
The solution states to use this config on the middle switch:
switchport mode dot1q-tunnel
l2protocol tunnel cdp
My question is why are they using a dot1q-tunnel when the end switches
are not even using dot1q encapsulation (they are layer 3 ports)?
I was able to get this working simply with the l2protocol tunnel
command on the middle switch with the ports in access mode.
This archive was generated by hypermail 2.1.4 : Sat Sep 01 2007 - 11:32:13 ART