From: Dan C (cdan2154@gmail.com)
Date: Sun Feb 15 2009 - 11:03:52 ARST
Hi ,
Here is a working sample config.... you will need to add an extra vlan
in this case vlan 100 and both switches trunk using dot1q
Topology
R1------ Sw1=======dot1q trunk======Sw2---------R2
for both sw1 and sw2 system mtu 1504
SW1 configs
interface FastEthernet2/0/1
switchport access vlan 100
switchport mode dot1q-tunnel
l2protocol-tunnel cdp
no cdp enable
SW2 configs
interface FastEthernet1/0/2
switchport access vlan 100
switchport mode dot1q-tunnel
l2protocol-tunnel cdp
no cdp enable
Verify:
SW2#sh l2p
SW2#sh l2protocol-tunnel
COS for Encapsulated Packets: 5
Drop Threshold for Encapsulated Packets: 0
Port Protocol Shutdown Drop Encapsulation Decapsulation Drop
Threshold Threshold Counter Counter Counter
---------- -------- --------- --------- ------------- -------------
-------------
Fa1/0/2 cdp ---- ---- 283 277
0
--- ---- ---- ---- ----
----
--- ---- ---- ---- ----
----
--- ---- ---- ---- ----
----
--- ---- ---- ---- ----
----
--- ---- ---- ---- ----
----
SW2#
R2
R2#sh cdp nei
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater
Device ID Local Intrfce Holdtme Capability Platform Port ID
SW1 Fas 0/0 130 R S I WS-C3750- Fas 2/0/2
R1 Fas 0/1 168 R 3640 Fas 0/0
R3 Ser 0/1 137 R S 2651XM Ser 1/3
R2#
R1
R1#sh cdp nei
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater
Device ID Local Intrfce Holdtme Capability Platform Port ID
R2 Fas 0/0 161 R S 2651 Fas 0/1
R3 Ser 0/1 178 R S 2651XM Ser 1/2
R1_R5#
As for documentation have a look at:
http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12.2_25_se/configuration/guide/swtunnel.html
HTH,
Dan
On Sun, Feb 15, 2009 at 11:34 PM, khurram noor
<smartcapricon82@gmail.com> wrote:
> 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
>
>
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