VLAN-Based EoMPLS, running MST, how to transport customers BPDUs

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Dec 13th, 2009
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Hi ,

following Problem:

On our PE Router/Switches we MUST run MST

Customers are directly connected to our PE

Now we are looking for a solution how to isolate Customer STP (RPVSTP, MST, Legacy) from our MST and to transport Customers BPDUs transparent via EoMPLS to the ohter customer-site.

This is not a Problem when using Port-Based EoMPLS, the we can do following config

Interface gig1/1

l2protocol-tunnel stp

xconnect c.c.c.c encapsulation mpls

But if we have to to VLAN-Based EoMPLS I have no Idea how to do this ?

As I know there is now way if running MST to disable STP for a particular VLAN, and its also not possible to configure l2protocol-tunnel in this scenario.

Also a BPDU-filter does not help, because customer wants to have his BDUs transported ?

Any Idea ?


Konfig on N-PE

!## we need to run MST on the Box (so in my opinion that means that every VLAN is assigned to one MST-Instance, per default MST0

spanning-tree mode mst

spanning-tree mst configuration

revision 1

!## I think this is no possible to configure if MST is running

!## no spanning-tree vlan 100,200

interface GigabitEthernet1/1

!## l2protocol-tunnel stp   config only allowed on Switchport ??

!## the way how to configure VLAN-based MPLS on "normal" LAN-Line-Card

interface GigabitEthernet1/1.100

encapsulation dot1q 100

xconnect a.a.a.a encapsulation mpls

interface GigabitEthernet1/1.200

encapsulation dot1q 200

xconnect b.b.b.b encapsulation mpls

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Giuseppe Larosa Mon, 12/14/2009 - 06:49
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Hello Hubert,

yours is an interesting question.

the following chapter of High Availability Design guide may be of help.

we can see the usage of multiple MST instances on different sets of vlans


Actually if PVST+ or Rapid PVST was in use on provider side the recommended approach would be that of disabling STP instances for the vlans that are EoMPLS switched.

Hope to help



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