Re: DOT1q tunnels with etherchannel

From: Dennis Worth (dennis.worth@gmail.com)
Date: Thu Mar 05 2009 - 17:24:37 ARST

Sadiq,

I could not find any details in the DOC CD to why, but the configs do
separate them into multiple vlans. All I know is that is suspends the
etherchannel interfaces if I try to change the vlan access to match on both
provider ports.
This is what I found:

This example shows how to configure the SP edge switch 1 and edge switch 2.
VLANs 17, 18, 19, and 20 are the access VLANs, Fast Ethernet interfaces 1
and 2 are point-to-point tunnel ports with PAgP and UDLD enabled, the drop
threshold is 1000, and Fast Ethernet interface 3 is a trunk port.

SP edge switch 1 configuration:

Switch(config)# *interface fastethernet0/1*

Switch(config-if)# *switchport access vlan 17*

Switch(config-if)# *switchport mode dot1q-tunnel*

Switch(config-if)# *l2protocol-tunnel point-to-point pagp*

Switch(config-if)# *l2protocol-tunnel point-to-point udld*

Switch(config-if)# *l2protocol-tunnel drop-threshold point-to-point pagp 1000*

Switch(config-if)# *exit*

Switch(config)# *interface fastethernet0/2*

Switch(config-if)# *switchport access vlan 18*

Switch(config-if)# *switchport mode dot1q-tunnel*

Switch(config-if)# *l2protocol-tunnel point-to-point pagp*

Switch(config-if)# *l2protocol-tunnel point-to-point udld*

Switch(config-if)# *l2protocol-tunnel drop-threshold point-to-point pagp 1000*

Switch(config-if)# *exit*

Switch(config)# *interface fastethernet0/3*

Switch(config-if)# *switchport trunk encapsulation isl*

Switch(config-if)# *switchport mode trunk*

SP edge switch 2 configuration:

Switch(config)# *interface fastethernet0/1*

Switch(config-if)# *switchport access vlan 19*

Switch(config-if)# *switchport mode dot1q-tunnel*

Switch(config-if)# *l2protocol-tunnel point-to-point pagp*

Switch(config-if)# *l2protocol-tunnel point-to-point udld*

Switch(config-if)# *l2protocol-tunnel drop-threshold point-to-point pagp 1000*

Switch(config-if)# *exit*

Switch(config)# *interface fastethernet0/2*

Switch(config-if)# *switchport access vlan 20*

Switch(config-if)# *switchport mode dot1q-tunnel*

Switch(config-if)# *l2protocol-tunnel point-to-point pagp*

Switch(config-if)# *l2protocol-tunnel point-to-point udld*

Switch(config-if)# *l2protocol-tunnel drop-threshold point-to-point pagp 1000*

Switch(config-if)# *exit*

Switch(config)# *interface fastethernet0/3*

Switch(config-if)# *switchport trunk encapsulation isl*

Switch(config-if)# *switchport mode trunk*

Thanks,
On Thu, Mar 5, 2009 at 11:17 AM, Sadiq Yakasai <sadiqtanko@gmail.com> wrote:

> Hi Dennis,
>
> is this doc any helpful?
>
>
> http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12.2_46_se/configuration/guide/swtunnel.html#wp1018452
>
> Sadiq
>
> On Thu, Mar 5, 2009 at 6:03 PM, Dennis Worth <dennis.worth@gmail.com>wrote:
>
>> Hey group,
>> I have a quick query with regards to why 2 separate vlans are required on
>> the provider side of dot1q tunnels when using ether channel. If anyone has
>> a
>> document on this, that would be great. See Below for diagram.
>>
>> SW3 --- SW4
>> | |
>> | |
>> SW1 --- SW2
>>
>> Switch 3 and for are aggregating 2 ports and the tunnel runs between edge
>> on sw1 and sw2. The problem is that each interface connected to the
>> customer
>> switches needs a separate access vlan. Why is this? What underlying theme
>> is
>> there? I tried to debug the l2protocol-tunnel but with no success.
>>
>> Thanks,
>> --
>> Dennis Worth
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
>> _______________________________________________________________________
>> Subscription information may be found at:
>> http://www.groupstudy.com/list/CCIELab.html
>>
>>
>>
>>
>>
>>
>>
>>
>
>
> --
> CCIE #19963
> 

-- 
Dennis Worth

Blogs and organic groups at http://www.ccie.net

This archive was generated by hypermail 2.1.4 : Mon Apr 06 2009 - 06:44:04 ART