From: Scott Morris (smorris@internetworkexpert.com)
Date: Sun Feb 15 2009 - 13:00:42 ARST
If the transit portion is on a single switch, you can just as easily be in
access-mode instead of dot1q-tunnel mode on the ports. The endpoints, in
this case SW3 and SW4 know NOTHING about the dot1q tunneling or l2protocol
forwarding. That's the point, you're trying to be "invisible" on SW2!
Disabling CDP on SW2 for those ports is a "nice" thing to avoid the
confusion of double CDP occurrences. Those ports simply need to be in the
same VLAN, and preferably one that ONLY exists on SW2 to avoid any potential
looping issues (as multicasts list CDP are flooded out all ports in a vlan!)
HTH,
Scott Morris, CCIE4 #4713, JNCIE-M #153, JNCIS-ER, CISSP, et al.
JNCI-M/JNCI-ER
Senior CCIE Instructor
smorris@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
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Knowledge is power.
Power corrupts.
Study hard and be Eeeeviiiil......
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
khurram noor
Sent: Sunday, February 15, 2009 7:34 AM
To: Cisco certification
Subject: l2protocol tunneling
Hello everyone,
I have a question about l2 protocol tunneling. which i have incomplete
answer in ie solution.
The task is.
*Configure SW2 so that SW3 and SW4 see each other as CDP neighbors across
the routed link that connects them*
My understanding is as below.
- Disable CDP on the ports over SW2 which are connecting it to SW3 and
SW4 and enable l2protocol-tunnel cdp on same ports.
Will that be enough for it to work or do i need to perform similar action on
port over SW3 and SW4 that are connected to SW2?
I am asking this question as this l2protocol tunneling does not work over
dynamips, so i cannot test.
Kindly Help ! --
Khurram Noor
CCIP, CCNA
Blogs and organic groups at http://www.ccie.net
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