12-13-2009 10:28 PM - edited 03-04-2019 06:57 AM
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 ?
Hubert
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
12-14-2009 06:49 AM
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
http://www.cisco.com/en/US/docs/solutions/Enterprise/Data_Center/HA_Clusters/HA_IAF_5.html#wp1244650
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
Giuseppe
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