Catalyst 4500Series Switch- QinQ - Vlan Mapping

[mustafa.caner.canturk]

Hi Community

I'm stucked with QinQ. Let's say you have 1 router and 3 switches A,B and C which are connected in this order:

RtoAtoBtoC.

You have to remove the switch B and then your new diagram will be like this;

RtoAtoC.

Here you are the current port modes and Vlan IDs. 

Port modes/Vlans between A&B;

R:Encapsulation dot1Q ,subinterface with S-Vlan

A:Trunk mode(S-Vlan)

Port modes&Vlans between A&B;

A:Trunk mode(S-Vlan)

B:Dot1q-tunnelling mode(C-Vlan)

Port modes&Vlans between B&C;

B:Trunk mode(C-Vlan)

C:Trunk mode(C-Vlan)

After removing Switch B, how could it be possible to keep giving QinQ services on switch A without wasting extra ports? What might be the possible port configuration options on this new path? Does Vlan-Mapping works /how?

Hint: You are not allowed to get some additional ports on R and C. (Only one port is allowed to use) BTW, A is a 4500 Swicth.

[Georg Pauwen]

Hello,

Vlan mapping is probably what they are looking for. On the 4500, configure the port like this:

switchport mode trunk

switchport vlan mapping C-VLAN S-VLAN

Have a look at the link below:

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/XE3-8-0E/15-24E/configuration/guide/xe-380-configuration/tunnel.html#29167

[mustafa.caner.canturk]

Hi Georg

Thanks for your reply. Yes l have read this link previously but I feel confused just right at this point and couldn't see any detailed example about implementing vlan-mapping on qinq config on the internet.

As you know, qinq must be set on the other far end of the path. The current structure is like below;

Cust1LondonSide------>Z[QinQ]>>>>>>[T]Y[T]>>>>>>>[T]R[T]>>>>>>[T]A[T]>>>>>>[T]B[T]>>>>>>[QinQ]C[T]<------Cust1TokyoSide

Do you have any idea Where to exactly apply vlan mapping config on the new topo below?

Cust1LondonSide------>Z[QinQ?]>>>>>>[T]Y[T]>>>>>>>[T]R[T]>>>>>>[?]A[?]>>>>>>[?]C[T]<------Cust1TokyoSide

After applying Vlan-Mapping, is it required to change any config on the above QinQ topology on Z node? 

BR

Caner

[Georg Pauwen]

Hello,

the far end is the C switch, right ? Does that switch support the same trunk configuration as switch A (the 4500) ?

switchport mode trunk

switchport vlan mapping C-VLAN S-VLAN

[mustafa.caner.canturk]

Nope, l mean Z switch for the term "far end". C is my ISP's switch(huawei s5700) and yes it is in trunk mode. (All vlans are carried out here.) 

[paul driver]

Hello

Maybe a couple of topology digrams pre-post changes would say a thousand words?

[mustafa.caner.canturk]

Hi Paul

l have uploaded before and after topologies. The point is how to configure QinQ in new topology by using only one port on each device. No extra ports are allowed on R and C. Your valuable comment is appreciated.

BR

Caner