L2TPv3 tunnel up but pings are failing

Question

Hi,
I have configured an L2TP tunnel between loopbacks on an ASR1004 and an ASR1001. The tunnel gets established, and even shows me some two-way traffic counters (they don't increment in line with ICMP requests so don't know if they represent my ping attempts per se).
When I generate ICMP traffic, I learn MAC addresses on both ends, including within the ARP tables on the hosts. However, the pings time out. I have attached a diagram and have pasted some show outputs below.
Any ideas or suggestions would be greatly appreciated, thanks!
Wlg-COR-02#show ver
Cisco IOS Software, IOS-XE Software (X86_64_LINUX_IOSD-UNIVERSAL-M), Version 15.1(1)S, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Mon 22-Nov-10 12:32 by mcpre
Cisco IOS-XE software, Copyright (c) 2005-2010 by cisco Systems, Inc.
All rights reserved.  Certain components of Cisco IOS-XE software are
licensed under the GNU General Public License ("GPL") Version 2.0.  The
software code licensed under GPL Version 2.0 is free software that comes
with ABSOLUTELY NO WARRANTY.  You can redistribute and/or modify such
GPL code under the terms of GPL Version 2.0.  For more details, see the
documentation or "License Notice" file accompanying the IOS-XE software,
or the applicable URL provided on the flyer accompanying the IOS-XE
software.
ROM: IOS-XE ROMMON
Wlg-COR-02 uptime is 2 weeks, 6 days, 14 hours, 59 minutes
Uptime for this control processor is 2 weeks, 6 days, 15 hours, 0 minutes
System returned to ROM by reload at 17:33:31 NZST Tue Aug 12 2014
System restarted at 00:22:39 NZDT Thu Oct 9 2014
System image file is "bootflash:/asr1001-universal.03.02.00.S.151-1.S.bin"
Last reload reason: PowerOn
License Info:
License UDI:
Device# PID                     SN                      UDI
*0      ASR1001                 JAE15290CAP             ASR1001:JAE15290CAP
License Package Information for Module:'asr1001'
Module name   Image level          Priority   Configured   Valid license
asr1001       adventerprise        1          NO           adventerprise
              advipservices        2          NO           advipservices
              ipbase               3          NO           ipbase
Current License Level: advipservices
cisco ASR1001 (1RU) processor with 1217912K/6147K bytes of memory.
4 Gigabit Ethernet interfaces
32768K bytes of non-volatile configuration memory.
4194304K bytes of physical memory.
7782399K bytes of eUSB flash at bootflash:.
Configuration register is 0x2102
Wlg-COR-02#show l2tun session all
L2TP Session Information Total tunnels 1 sessions 1
Session id 3769661188 is up, logical session id 65548, tunnel id 3529463940
  Remote session id is 1878828549, remote tunnel id 1043662242
  Remotely initiated session
  Unique ID is 12
Session Layer 2 circuit, type is Ethernet Vlan, name is Port-channel2.532:532
  Session vcid is 532
  Circuit state is UP
    Local circuit state is UP
    Remote circuit state is UP
Call serial number is 2074100010
Remote tunnel name is Air-COR-01
  Internet address is 210.48.12.100
Local tunnel name is Wlg-COR-02
  Internet address is 210.48.12.105
IP protocol 115
  Session is L2TP signaled
  Session state is established, time since change 03:41:52
    57 Packets sent, 48 received
    8190 Bytes sent, 6645 received
  Last clearing of counters never
  Counters, ignoring last clear:
    57 Packets sent, 48 received
    8190 Bytes sent, 6645 received
    Receive packets dropped:
      out-of-order:             0
      other:                    0
      total:                    0
    Send packets dropped:
      exceeded session MTU:     0
      other:                    0
      total:                    0
  DF bit off, ToS reflect disabled, ToS value 0, TTL value 255
  Sending UDP checksums are disabled
  Received UDP checksums are verified
  No session cookie information available
  FS cached header information:
    encap size = 24 bytes
    45000014 00000000 ff73fe48 d2300c69
    d2300c64 6ffca605
  Sequencing is off
  Conditional debugging is disabled
  SSM switch id is 8197, SSM segment id is 8201
Wlg-COR-02#
Wlg-COR-02#
Wlg-COR-02#show run inter
Wlg-COR-02#show run interface Po2.532
Building configuration...
Current configuration : 123 bytes
interface Port-channel2.532
 encapsulation dot1Q 532
 xconnect 210.48.12.100 532 encapsulation l2tpv3 pw-class l2tp
end
Wlg-COR-02#
Wlg-COR-02#
Wlg-COR-02#show run | beg pseudowire
pseudowire-class mpls-ethernet
 encapsulation mpls
 interworking ethernet
pseudowire-class l2tp
 encapsulation l2tpv3
 ip local interface Loopback4770
Air-COR-01#show version
Cisco IOS Software, IOS-XE Software (PPC_LINUX_IOSD-ADVIPSERVICESK9-M), Version 15.2(4)S4, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2013 by Cisco Systems, Inc.
Compiled Sun 01-Sep-13 09:53 by mcpre
IOS XE Version: 03.07.04.S
Cisco IOS-XE software, Copyright (c) 2005-2013 by cisco Systems, Inc.
All rights reserved.  Certain components of Cisco IOS-XE software are
licensed under the GNU General Public License ("GPL") Version 2.0.  The
software code licensed under GPL Version 2.0 is free software that comes
with ABSOLUTELY NO WARRANTY.  You can redistribute and/or modify such
GPL code under the terms of GPL Version 2.0.  For more details, see the
documentation or "License Notice" file accompanying the IOS-XE software,
or the applicable URL provided on the flyer accompanying the IOS-XE
software.
ROM: IOS-XE ROMMON
Air-COR-01 uptime is 35 weeks, 1 day, 15 hours, 26 minutes
Uptime for this control processor is 35 weeks, 1 day, 15 hours, 29 minutes
System returned to ROM by reload at 23:57:45 NZDT Mon Feb 24 2014
System restarted at 00:01:45 NZDT Tue Feb 25 2014
System image file is "bootflash:asr1000rp1-advipservicesk9.03.07.04.S.152-4.S4.bin"
Last reload reason: Reload Command
This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.
A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html
If you require further assistance please contact us by sending email to
[email protected].
cisco ASR1004 (RP1) processor with 1688640K/6147K bytes of memory.
Processor board ID FOX1544G2KE
16 Gigabit Ethernet interfaces
4 Ten Gigabit Ethernet interfaces
32768K bytes of non-volatile configuration memory.
4194304K bytes of physical memory.
937983K bytes of eUSB flash at bootflash:.
39004543K bytes of SATA hard disk at harddisk:.
Configuration register is 0x2102
Air-COR-01#show l2tun session all
L2TP Session Information Total tunnels 1 sessions 1
Session id 1878828549 is up, logical session id 42736, tunnel id 1043662242
  Remote session id is 3769661188, remote tunnel id 3529463940
  Locally initiated session
  Unique ID is 0
Session Layer 2 circuit, type is Ethernet Vlan, name is Port-channel2.532:532
  Session vcid is 532
  Circuit state is UP
    Local circuit state is UP
    Remote circuit state is UP
Call serial number is 2074100010
Remote tunnel name is Wlg-COR-02
  Internet address is 210.48.12.105
Local tunnel name is Air-COR-01
  Internet address is 210.48.12.100
IP protocol 115
  Session is L2TP signaled
  Session state is established, time since change 03:47:28
    48 Packets sent, 58 received
    6645 Bytes sent, 8437 received
  Last clearing of counters never
  Counters, ignoring last clear:
    48 Packets sent, 58 received
    6645 Bytes sent, 8437 received
    Receive packets dropped:
      out-of-order:             0
      other:                    0
      total:                    0
    Send packets dropped:
      exceeded session MTU:     0
      other:                    0
      total:                    0
  DF bit off, ToS reflect disabled, ToS value 0, TTL value 255
  Sending UDP checksums are disabled
  Received UDP checksums are verified
  No session cookie information available
  FS cached header information:
    encap size = 24 bytes
    45000014 00000000 ff73fe48 d2300c64
    d2300c69 e0b07704
  Sequencing is off
  Conditional debugging is disabled
  SSM switch id is 14061, SSM segment id is 5875
%No active PPTP tunnels
Air-COR-01#
Air-COR-01#
Air-COR-01#
Air-COR-01#
Air-COR-01#show run int
Air-COR-01#show run interface Po2.532
Building configuration...
Current configuration : 123 bytes
interface Port-channel2.532
 encapsulation dot1Q 532
 xconnect 210.48.12.105 532 encapsulation l2tpv3 pw-class l2tp
end
Air-COR-01#
Air-COR-01#
Air-COR-01#show run | beg pseudowire
pseudowire-class l2tp
 encapsulation l2tpv3
 ip local interface Loopback4770
air-agg-1-1#show mac address-table vlan 532
Legend: * - primary entry
        age - seconds since last seen
        n/a - not available
        S - secure entry
        R - router's gateway mac address entry
        D - Duplicate mac address entry
Displaying entries from DFC switch [1] linecard [1]:
     vlan   mac address    type   learn    age                 ports
----+----+---------------+-------+-----+----------+-----------------------------
      532 0050.569e.681d  dynamic  Yes      150     Po7
      532 0050.5695.0f0c  dynamic  Yes      320     Po7
  R   532 0008.e3ff.fc04   static   No       -      Router
WLG-AGG-01#show mac address-table vlan 532
          Mac Address Table
Vlan    Mac Address       Type        Ports
 All    0100.0ccc.cccc    STATIC      CPU
 All    0100.0ccc.cccd    STATIC      CPU
 All    0180.c200.0000    STATIC      CPU
 All    0180.c200.0001    STATIC      CPU
 All    0180.c200.0002    STATIC      CPU
 All    0180.c200.0003    STATIC      CPU
 All    0180.c200.0004    STATIC      CPU
 All    0180.c200.0005    STATIC      CPU
 All    0180.c200.0006    STATIC      CPU
 All    0180.c200.0007    STATIC      CPU
 All    0180.c200.0008    STATIC      CPU
 All    0180.c200.0009    STATIC      CPU
 All    0180.c200.000a    STATIC      CPU
 All    0180.c200.000b    STATIC      CPU
 All    0180.c200.000c    STATIC      CPU
 All    0180.c200.000d    STATIC      CPU
 All    0180.c200.000e    STATIC      CPU
 All    0180.c200.000f    STATIC      CPU
 All    0180.c200.0010    STATIC      CPU
 All    ffff.ffff.ffff    STATIC      CPU
 532    0050.5695.0f0c    DYNAMIC     Po2
 532    0050.569e.681d    DYNAMIC     Po4
Total Mac Addresses for this criterion: 22
WLG-AGG-01#

Answer 1

What does your ACL statement look like for defining access from your Celerra_Replication network, to your GP_Celerra_Replication network?
Also, do you reference that ACL in your crypto map?
A sanitized config may help me help you
-Chris