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CESoPSN (TDM) Pseudowire over MPLS via GRE Tunnel

I have two MWR2941's seperated by several routed hops in a non MPLS enabled core. I have a GPRS toycell on one side and a BSC on the other (this is not important) and need to configure an E1 CESoPSN (or SAToP -- I don't care) pseudowire. I realize that I need a GRE tunnel between the two MWR's in order to get MPLS to work properly. I have the GRE tunnel configured and the pseudowire is up, but I can only get one-way traffic on the CEM interface, even though the physical interface shows two-way traffic. The configs are fairly plain. Here is the BSC side -- the toycell side is identical with the IP addresses changed:

mpls label protocol ldp
xconnect logging pseudowire status
controller E1 0/0
clock source internal
cem-group 0 timeslots 1-31

pseudowire-class MPLS_EXP
encapsulation mpls
mpls experimental 5

interface Loopback0
ip address
interface Tunnel10
ip unnumbered Loopback0
mpls ip
tunnel source Vlan306
tunnel destination
interface GigabitEthernet0/0
switchport access vlan 306
switchport mode access

interface CEM0/0
no ip address
cem 0
  xconnect 360 encapsulation mpls pw-class MPLS_EXP

interface Vlan306
ip address
no ptp enable

ip route
ip route Tunnel10

I have tried everything that I can think of. I can only guess that it is an MTU issue. I havce tried PMTUD and TCP MSS with no luck. Any help would be appreciated greatly.



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CESoPSN (TDM) Pseudowire over MPLS via GRE Tunnel

And..... it turns out that the problem was related to IOS rev. I rolled back from 15-1.3 to 15-1.1 and everything works.

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