[c-nsp] pseudowire between two ME-C3750-24TE ports is not transparent to STP

[Martin T]

Hi,

I made a pseudowire between Cisco
ME-C3750-24TE(c3750me-i5k91-mz.122-58.SE2.bin) ES ports Gi1/1/1 and
Gi1/1/2:

ME-C3750-24TE#sh run int Gi1/1/1
Building configuration...

Current configuration : 38 bytes
!
interface GigabitEthernet1/1/1
end

ME-C3750-24TE#sh run int Gi1/1/2
Building configuration...

Current configuration : 38 bytes
!
interface GigabitEthernet1/1/2
end

ME-C3750-24TE#sh run | sec conne
connect TEST GigabitEthernet1/1/1 GigabitEthernet1/1/2
 !
ME-C3750-24TE#


Overall topology looks like this:

WS-C3750G-24TS[Gi1/0/28] <-> [Gi1/1/2]ME-C3750-24TE[Gi1/1/1] <->
[Gi1/0/12]WS-C3750G-12S


While the pseudowire is transparent for LACP or CDP:

WS-C3750G-12S#sh cdp neig
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
                  S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone

Device ID            Local Intrfce         Holdtme   Capability
Platform   Port ID
WS-C3750G-24TS      Gig 1/0/12            133            S I
WS-C3750G-Gig 1/0/28
WS-C3750G-12S#

WS-C3750G-24TS#sh cdp neig
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
                  S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone

Device ID            Local Intrfce         Holdtme   Capability
Platform   Port ID
WS-C3750G-12S       Gig 1/0/28            125            S I
WS-C3750G-Gig 1/0/12
WS-C3750G-24TS#

..it's not transparent for STP and the switch where the pseudowire is
created(ME-C3750-24TE) becomes the root bridge. Is the pseudowire
between interfaces not transparent for all the L2 protocols or am I
doing something wrong?



regards,
Martin