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Q-in-Q tunnelling

 

Hi,

Is it possible to create Q-in-Q tunnel in cisco 2921 and 2911 ISR without using a Ether switch module in these devices ?

Thanks & Regards,
Rahul Chhabra

 

8 REPLIES
Cisco Employee

Hello Rahul , No , This

Hello Rahul ,

 

No , This feature is supported on EtherSwitch service module , but not on the hosting routers .

 

HTH 

Regards

Sunil Bhadauria

New Member

 Thanks for Replying Sunil

 

Thanks for Replying Sunil
 

could you please tell me what do you mean by 'but not on the Hosting routers'

 

Thanks & Regards,
Rahul Chhabra
Network Engineer
Spooster IT Services

Cisco Employee

Hello Rahul , by hosting

Hello Rahul ,

 

by hosting router i mean the ISR router where the module is installed .

 

HTH

Regards

Sunil Bhadauria

New Member

 Thanks once again for

 

Thanks once again for helping me

Cisco Employee

YW , Just to add ,

YW ,

 

Just to add , etherswitch service module run  its own independent software then hosting router to provide additional features, and q-in-q tunneling is one of them .

 

Have a nice day ahead .

 

HTH 

Sunil Bhadauria

New Member

 Hi Sunil,I want to know

 

Hi Sunil,

I want to know something more about the Q-in-Q tunnel on Cisco 2921 ISR.
1. Could you please provide me a sample config with a small design of         creating a Q-in-Q tunnel.

2. Can you provide me any documentation to read about this feature.

3. Is their any other method or command to achieve this task without using
    a ether switch module on the ISR 2921.

Thanks & Regards,
Rahul Chhabra
Network Engineer 
Spooster IT Services

Cisco Employee

Hello Rahul , As far as I see

Hello Rahul ,

 

As far as I see , dot1q tunneling is not possible on 2900 without etherswitch services module .

You will get most of your answers in below documentation :

http://www.cisco.com/c/en/us/products/collateral/routers/2800-series-integrated-services-routers-isr/prod_qas0900aecd8028d16a.html 

 

Configuration guide : 

I do not see any documentation for 2900 platforms ( may be because they natively do not support it ) , but only additional command for dot1q tunnel funtionality needed is :

"switch-port mode dot1q-tunnel " on CE facing access port .

 

you may refer below documentation for configuration guide/example :

http://www.cisco.com/c/en/us/td/docs/switches/metro/me3400e/software/release/12-2_55_se/configuration/guide/ME3400e_scg/swtunnel.pdf 

 

-Other then dot1q tunneling another way to achieve q-in-q is vlan stacking . I never used this feature myself and do not have 2900 platform handly to test on it yet , but you can try below configuration to achieve it :

(apply similar configuration on other end accordingly )

===============================================

# Interface gi0/0

No ip address

 

#Int gig 0/0.20

Encapsulation dot1q 10 second 20

Ip address 10.0.20.1 255.255.255.0

 

Int gig 0/0.30

Encapsulation dot1q 10 second 30

ip address 10.0.30.1 255.255.255.0

=================================================

 

So in above configuration vlan 10 is outer vlan id which will be used to transport customer traffic through service provider environment untill far end PE router ( where similar set of configuration will ensure inner vlan id 20/30 to send traffic towards CE device ) .

 

You may refer below documentation for this feature and prerequisites :

 

http://www.cisco.com/en/US/docs/ios/lanswitch/configuration/guide/lsw_ieee_802.1q.html 

 

HTH 

Sunil Bhadauria

New Member

 Thanks sunil for providing

 

Thanks sunil for providing answers

Regards,
Rahul

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