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SVI-based EoMPLS through Port-Channel subinterface problem

Hello,

We have working scenario with ME3750 to 7606 (subinterfaces on ES20 card - 20x1Gbps) SVI-based xconnect. Because of aggregation needs, we are trying to migrate to port-channel (only interfaces from the ES20 card) with subinterfaces to be the core-facing side. But it doesn't work. The xconnect gets UP, VC status is UP, but there is no Output interface and imposed label stack from the 7606 side. At the same time on the ME3750 there is chosen interface and imposed label stack. As far as I checked, this is possible on the 7600 from IOS 12.2(33)SRE - we are using IOS 12.2(33)SRE6

 

==ME3750==

interface Vlan1126
 no ip address
 xconnect 10.3.0.2 1126 encapsulation mpls
end

interface Vlan3203
 ip address 10.7.14.131 255.255.255.192
 ip ospf mtu-ignore
 mpls mtu 1530
 mpls label protocol ldp
 mpls ip
end

interface GigabitEthernet1/1/2
 switchport trunk allowed vlan 3203
 switchport mode trunk
end

 

==7606==

 

interface Vlan1126
 mtu 1998
 ip address X.X.X.X 255.255.255.252
 no ip proxy-arp
 ip mtu 1500
 xconnect 10.3.1.15 1126 encapsulation mpls

end

interface GigabitEthernet2/0/6.3203
 encapsulation dot1Q 3203
 ip address 10.7.14.129 255.255.255.192
 ip ospf mtu-ignore
 mpls ip
 mpls label protocol ldp

end

--(which should be migrated to)--

interface Port-channel7.3203
 encapsulation dot1Q 3203
 ip address 10.7.14.129 255.255.255.192
 ip ospf mtu-ignore
 mpls ip
 mpls label protocol ldp

end

 

--Output from 7606 in the working case (Gi2/0/6.3203)--

sh mpls l2transport vc 1126 detail
Local interface: Vl1126 up, line protocol up, Eth VLAN 1126 up
  Destination address: 10.3.1.15, VC ID: 1126, VC status: up
    Output interface: Gi2/0/6.3203, imposed label stack {484}
    Preferred path: not configured
    Default path: active
    Next hop: 10.7.14.131
  Create time: 01:02:02, last status change time: 00:00:02
  Signaling protocol: LDP, peer 10.3.1.15:0 up
    Targeted Hello: 10.3.0.2(LDP Id) -> 10.3.1.15, LDP is UP
    Status TLV support (local/remote)   : enabled/not supported
      LDP route watch                   : enabled
      Label/status state machine        : established, LruRru
      Last local dataplane   status rcvd: No fault
      Last local SSS circuit status rcvd: No fault
      Last local SSS circuit status sent: No fault
      Last local  LDP TLV    status sent: No fault
      Last remote LDP TLV    status rcvd: Not sent
      Last remote LDP ADJ    status rcvd: No fault
    MPLS VC labels: local 2472, remote 484
    Group ID: local 0, remote 0
    MTU: local 1998, remote 1998
    Remote interface description:
  Sequencing: receive disabled, send disabled
  Control Word: Off (configured: autosense)
  VC statistics:
    transit packet totals: receive 20, send 21
    transit byte totals:   receive 1474, send 1532
    transit packet drops:  receive 0, seq error 0, send 0

 

 

--Output from 7606 in the non-working case (Port-channel7.3203)--

sh mpls l2transport vc 1126 detail
Local interface: Vl1126 up, line protocol up, Eth VLAN 1126 up
  Destination address: 10.3.1.15, VC ID: 1126, VC status: up
    Output interface: none, imposed label stack {}
    Preferred path: not configured
    Default path: active
    No adjacency
  Create time: 01:01:06, last status change time: 00:02:05
  Signaling protocol: LDP, peer 10.3.1.15:0 up
    Targeted Hello: 10.3.0.2(LDP Id) -> 10.3.1.15, LDP is UP
    Status TLV support (local/remote)   : enabled/not supported
      LDP route watch                   : enabled
      Label/status state machine        : established, LruRru
      Last local dataplane   status rcvd: No fault
      Last local SSS circuit status rcvd: No fault
      Last local SSS circuit status sent: No fault
      Last local  LDP TLV    status sent: No fault
      Last remote LDP TLV    status rcvd: Not sent
      Last remote LDP ADJ    status rcvd: No fault
    MPLS VC labels: local 2472, remote 484
    Group ID: local 0, remote 0
    MTU: local 1998, remote 1998
    Remote interface description:
  Sequencing: receive disabled, send disabled
  Control Word: Off (configured: autosense)
  VC statistics:
    transit packet totals: receive 20, send 21
    transit byte totals:   receive 1474, send 1532
    transit packet drops:  receive 0, seq error 0, send 0

 

 

 

Mod Ports Card Type                                                 Model             
--- ----- ---------------------------------------------------------- ------------------------
  2   20  ESM20G                                                      7600-ES20-GE3C    
  3   48  CEF720 48 port 10/100/1000mb Ethernet   WS-X6748-GE-TX    
  4    8  CEF720 8 port 10GE with DFC                    WS-X6708-10GE     
  5    2  Route Switch Processor 720 (Active)           RSP720-3C-GE      

 

 

I hope someone could help :)

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