From: Joseph Brunner (joe@affirmedsystems.com)
Date: Sun Aug 26 2007 - 21:35:38 ART
I tried to get it going as the task hinted, with 1 vlan only. The channel's
kept bouncing and pings were not successful. I realized how etherchannel is
a POINT TO POINT technology. Using 1 vlan for "both dot1q tunnels" would
break that point to point technology, and make it running etherchannel via
hub (of sorts)...
I did it with 2 vlans, and it worked, so I verified, add the points and kept
going.
LOL
-Joe
-----Original Message-----
From: CCIE 19999 [mailto:ccie@iprimus.com.au]
Sent: Sunday, August 26, 2007 7:32 PM
To: 'Joseph Brunner'; 'Gregory Gombas'; 'Cisco certification'
Subject: RE: IE Lab9 Task 1.7 L2 Tunnel
Joe,
When you apply the command L2protocol-tunnel cdp, the end ports would see
each other directly connected. Isn't it? Also, the task says, IF YOU NEED
ANY ADDITIONAL VLANS, then use 100. And you are using 100 and 101. Is that a
correct approach?
So in my opinion, of you can get this working without using any additional
vlans, the solutions must be correct.
Any addional thoughts welcome.
Regards,
Shine
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Joseph Brunner
Sent: Monday, 27 August 2007 8:36 AM
To: 'Gregory Gombas'; 'Cisco certification'
Subject: RE: IE Lab9 Task 1.7 L2 Tunnel
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.
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