Welcome To The World Of Hierarchical LSPs...AKA Unified MPLS...AKA Seamless MPLS = RFC 3107 (Part-1)

For quite a while I have been trying to understand Hierarchical LSPs uder Cisco New Model developed for Mobile Operators known as Unified MPLS For Mobile Transport (UMMT). In case you haven't noticed, this new model came into picture officially early this year and after certain revisions they reached on version 3 or UMMT 3.0 as final model so far.

The idea behind UMMT is to move away from Traditional flat IP network design that Service Providers have been using for many years. Where they usually run Single IS-IS Level-2 Domain across entire core or Single OSPF Area as well. This design has couple of problems to begin with:

> Single Flat Network Domain Means any small change or instability will cause LSA Flooding or Re-Calculation.

> The network doesn't scale very well as it grows. Eventually large IGP domains means lots of burden on IGP which also further affects our Convergence Requirements from Today's Networks.

> You cannot break network into small pieces/domains as our LSPs requirements are End to End from PE's perspective in order to offer services such as L2/L3 MPLS VPNs & Traffic Engineering etc.

The Idea behind UMMT 3.0 Model is to break the network into multiple domains using different IGP Instances and yet not to compromise on our End To End LSP requirements. So the final picture looks some thing like following:

But as you can below it helps allot with minimizing the routes in every single domains which further helps with Network Convergence requirements of modern networks. Though Network Convergence is a big topic in itself and there are lot of recipes that goes with it in order to achieve the ultimate goal of 50 msec or less convergence time. But I'll focus more on Network Convergence is coming posts.

Although UMMT is a kind of model only, but Cisco is showcasing it's ASR & ME Product line being part of model as follows:

UMMT uses our old friend BGP for creating End to End LSP (Inter Domain) on top of existing LDP based LSPs (Intra Domain). For this they developed something called BGP Labeled Unicast documented under rfc 3107 which to my surprise was written in 2001 :)

With That being said. Here is a Quick Lab Demonstrating how everything fits together and how overall label space will work:

Complete Configuration:
================

R1
##

!
en
!
conf t
!
ho CE-1
!
no ip do lo
!
no cdp run
!
line con 0
 no exec-time
 logging syn
 exit
!
int lo0
 ip add 1.1.1.1 255.255.255.255
 exit
!
int f0/0
 ip add 150.0.0.1 255.255.255.0
 no sh
 exit
!
router eigrp 100
 no auto
 net 1.1.1.1 0.0.0.0
 net 150.0.0.1 0.0.0.0
 exit
!
end
!

++++++++++++++++++++++++++++

R9
##

!
en
!
conf t
!
ho CE-2
!
no ip do lo
!
no cdp run
!
line con 0
 no exec-time
 logging syn
 exit
!
int lo0
 ip add 9.9.9.9 255.255.255.255
 exit
!
int f0/0
 ip add 150.0.0.9 255.255.255.0
 no sh
 exit
!
router eigrp 100
 no auto
 net 9.9.9.9 0.0.0.0
 net 150.0.0.9 0.0.0.0
 exit
!
end
!

++++++++++++++++++++++++++++

R2
##

!
en
!
conf t
!
ho PE-1
!
no ip do lo
!
no cdp run
!
line con 0
 no exec-time
 logging syn
 exit
!
int lo0
 ip add 2.2.2.2 255.255.255.255
 exit
!
int f1/0
 no sh
 xconnect 8.8.8.8 1 encapsulation mpls
 exit
exit
!
int f1/1
 ip add 23.23.23.2 255.255.255.0
 mpls ip
 no sh
 exit
!
mpls label protocol ldp
!
mpls ldp router-id lo0
!
router ospf 1
 net 2.2.2.2 0.0.0.0 area 0
 net 23.23.23.2 0.0.0.0 area 0
 exit
!
router bgp 100
 no auto
 no sync
 net 2.2.2.2 mask 255.255.255.255
 nei 4.4.4.4 remote 100
 nei 4.4.4.4 update lo0
 nei 4.4.4.4 send-label
 exit
!
end
!

++++++++++++++++++++++++++++


R3
##

!
en
!
conf t
!
ho P-1
!
no ip do lo
!
no cdp run
!
line con 0
 no exec-time
 logging syn
 exit
!
int lo0
 ip add 3.3.3.3 255.255.255.255
 exit
!
!
mpls label protocol ldp
!
mpls ldp router-id lo0
!
int f0/0
 ip add 23.23.23.3 255.255.255.0
 mpls ip
 no sh
 exit
!
int f0/1
 ip add 34.34.34.3 255.255.255.0
 mpls ip
 no sh
 exit
!
router ospf 1
 net 0.0.0.0 255.255.255.255 area 0
 exit
!
end
!

++++++++++++++++++++++++++++


R4
##

!
en
!
conf t
!
ho RR-1
!
no ip do lo
!
no cdp run
!
line con 0
 no exec-time
 logging syn
 exit
!
int lo0
 ip add 4.4.4.4 255.255.255.255
 exit
!
!
mpls label protocol ldp
!
mpls ldp router-id lo0
!
int f1/0
 ip add 34.34.34.4 255.255.255.0
 mpls ip
 no sh
 exit
!
int f1/1
 ip add 45.45.45.4 255.255.255.0
 mpls ip
 no sh
 exit
!
router ospf 2
 net 4.4.4.4 0.0.0.0 area 0
 net 45.45.45.4 0.0.0.0 area 0
 exit
!
ip prefix-list R4Loopback0 seq 5 permit 4.4.4.4/32
!
route-map ospf2-into-ospf1 permit 10
 match ip address prefix-list R4Loopback0
 exit
!
router ospf 1
 net 34.34.34.4 0.0.0.0 area 0
 redistribute ospf 2 subnets match internal route-map ospf2-into-ospf1
 exit
!
router bgp 100
 no auto
 no sync
 nei 2.2.2.2 remote 100
 nei 2.2.2.2 update lo0
 nei 2.2.2.2 route-reflector-client
 nei 2.2.2.2 next-hop-self all
 nei 2.2.2.2 send-label
! 
 nei 6.6.6.6 remote 100
 nei 6.6.6.6 update lo0
 nei 6.6.6.6 route-reflector-client
 nei 6.6.6.6 next-hop-self all
 nei 6.6.6.6 send-label
 exit
!
end
!
++++++++++++++++++++++++++++


R5
##

!
en
!
conf t
!
ho P-2
!
no ip do lo
!
no cdp run
!
line con 0
 no exec-time
 logging syn
 exit
!
int lo0
 ip add 5.5.5.5 255.255.255.255
 exit
!
!
mpls label protocol ldp
!
mpls ldp router-id lo0
!
int f0/0
 ip add 45.45.45.5 255.255.255.0
 mpls ip
 no sh
 exit
!
int f0/1
 ip add 56.56.56.5 255.255.255.0
 mpls ip
 no sh
 exit
!
router ospf 2
 net 0.0.0.0 255.255.255.255 area 0
 exit
!
end
!

++++++++++++++++++++++++++++


R6
##

!
en
!
conf t
!
ho RR-2
!
no ip do lo
!
no cdp run
!
line con 0
 no exec-time
 logging syn
 exit
!
int lo0
 ip add 6.6.6.6 255.255.255.255
 exit
!
!
mpls label protocol ldp
!
mpls ldp router-id lo0
!
int f1/1
 ip add 56.56.56.6 255.255.255.0
 mpls ip
 no sh
 exit
!
int f1/0
 ip add 76.76.76.6 255.255.255.0
 mpls ip
 no sh
 exit
!
!
router ospf 2
 net 6.6.6.6 0.0.0.0 area 0
 net 56.56.56.6 0.0.0.0 area 0
 exit
!
ip prefix-list R6Loopback0 seq 5 permit 6.6.6.6/32
!
route-map ospf2-into-ospf3 permit 10
 match ip address prefix-list R6Loopback0
 exit
!
router ospf 3
 net 76.76.76.6 0.0.0.0 area 0
 redistribute ospf 2 subnets match internal route-map ospf2-into-ospf3
 exit
!
router bgp 100
 no auto
 no sync
 nei 4.4.4.4 remote 100
 nei 4.4.4.4 update lo0
 nei 4.4.4.4 route-reflector-client
 nei 4.4.4.4 next-hop-self all
 nei 4.4.4.4 send-label
! 
 nei 8.8.8.8 remote 100
 nei 8.8.8.8 update lo0
 nei 8.8.8.8 route-reflector-client
 nei 8.8.8.8 next-hop-self all
 nei 8.8.8.8 send-label
 exit
!
end
!

++++++++++++++++++++++++++++

R7
##

!
en
!
conf t
!
ho P-3
!
no ip do lo
!
no cdp run
!
line con 0
 no exec-time
 logging syn
 exit
!
int lo0
 ip add 7.7.7.7 255.255.255.255
 exit
!
!
mpls label protocol ldp
!
mpls ldp router-id lo0
!
int f0/1
 ip add 76.76.76.7 255.255.255.0
 mpls ip
 no sh
 exit
!
int f0/0
 ip add 87.87.87.7 255.255.255.0
 mpls ip
 no sh
 exit
!
router ospf 3
 net 0.0.0.0 255.255.255.255 area 0
 exit
!
end
!
++++++++++++++++++++++++++++

R8
##

!
en
!
conf t
!
ho PE-2
!
no ip do lo
!
no cdp run
!
line con 0
 no exec-time
 logging syn
 exit
!
int lo0
 ip add 8.8.8.8 255.255.255.255
 exit
!
!
mpls label protocol ldp
!
mpls ldp router-id lo0
!
int f1/1
 ip add 87.87.87.8 255.255.255.0
 mpls ip
 no sh
 exit
!
int f1/0
 no sh
 xconnect 2.2.2.2 1 encapsulation mpls
 exit
exit
!
router ospf 3
 net 8.8.8.8 0.0.0.0 area 0
 net 87.87.87.8 0.0.0.0 area 0
 exit
!
router bgp 100
 no auto
 no sync
 net 8.8.8.8 mask 255.255.255.255
 nei 6.6.6.6 remote 100
 nei 6.6.6.6 update lo0
 nei 6.6.6.6 send-label
 exit
!
end
!


+++++++++++++++++++++++++++++

Label Space & Verification
=================

PE-1#sh mpls forwarding-table
Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop
Label      Label      or Tunnel Id     Switched      interface
16         Pop Label  3.3.3.3/32       0             Fa1/1      23.23.23.3
17         Pop Label  34.34.34.0/24    0             Fa1/1      23.23.23.3
18         17         4.4.4.4/32       0             Fa1/1      23.23.23.3
19         No Label   l2ckt(1)         29118         Fa1/0      point2point

PE-1#sh ip route 8.8.8.8
Routing entry for 8.8.8.8/32
  Known via "bgp 100", distance 200, metric 0, type internal
  Last update from 4.4.4.4 00:39:45 ago
  Routing Descriptor Blocks:
  * 4.4.4.4, from 4.4.4.4, 00:39:45 ago
      Route metric is 0, traffic share count is 1
      AS Hops 0
      MPLS label: 22

PE-1#sh ip cef 8.8.8.8
8.8.8.8/32
  nexthop 23.23.23.3 FastEthernet1/1 label 17 22

PE-1#sh ip cef 8.8.8.8 detail
8.8.8.8/32, epoch 0, flags rib defined all labels
  1 RR source [no flags]
  recursive via 4.4.4.4 label 22
    nexthop 23.23.23.3 FastEthernet1/1 label 17

PE-1#sh bgp ipv4 unicast labels
   Network          Next Hop      In label/Out label
   2.2.2.2/32       0.0.0.0         imp-null/nolabel
   8.8.8.8/32       4.4.4.4         nolabel/22


P-1#sh mpls forwarding-table
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop
tag    tag or VC   or Tunnel Id      switched   interface
16     Pop tag     2.2.2.2/32        60043      Fa0/0      23.23.23.2
17     Pop tag     4.4.4.4/32        63026      Fa0/1      34.34.34.4

P-1#sh mpls forwarding-table labels 17 detail
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop
tag    tag or VC   or Tunnel Id      switched   interface
17     Pop tag     4.4.4.4/32        111825     Fa0/1      34.34.34.4
        MAC/Encaps=14/14, MRU=1504, Tag Stack{}
        CA0C17A0001CC20B1B2000018847
        No output feature configured
    Per-packet load-sharing


RR-1#sh mpls forwarding-table
Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop
Label      Label      or Tunnel Id     Switched      interface
16         Pop Label  3.3.3.3/32       0             Fa1/0      34.34.34.3
17         16         2.2.2.2/32       57654         Fa1/0      34.34.34.3
18         Pop Label  23.23.23.0/24    0             Fa1/0      34.34.34.3
19         Pop Label  5.5.5.5/32       0             Fa1/1      45.45.45.5
20         Pop Label  56.56.56.0/24    0             Fa1/1      45.45.45.5
21         17         6.6.6.6/32       0             Fa1/1      45.45.45.5
22         21         8.8.8.8/32       60902         Fa1/1      45.45.45.5


RR-1#sh mpls forwarding-table labels 22 detail
Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop
Label      Label      or Tunnel Id     Switched      interface
22         21         8.8.8.8/32       111502        Fa1/1      45.45.45.5
        MAC/Encaps=14/22, MRU=1496, Label Stack{17 21}
        C20D1B200000CA0C17A0001D8847 0001100000015000
        No output feature configured

RR-1#sh bgp ipv4 unicast labels
   Network          Next Hop      In label/Out label
   2.2.2.2/32       2.2.2.2         17/imp-null
   8.8.8.8/32       6.6.6.6         22/21


P-2#sh mpls forwarding-table
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop
tag    tag or VC   or Tunnel Id      switched   interface
16     Pop tag     4.4.4.4/32        63393      Fa0/0      45.45.45.4
17     Pop tag     6.6.6.6/32        63803      Fa0/1      56.56.56.6

P-2#sh mpls forwarding-table labels 16 detail
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop
tag    tag or VC   or Tunnel Id      switched   interface
16     Pop tag     4.4.4.4/32        124541     Fa0/0      45.45.45.4
        MAC/Encaps=14/14, MRU=1504, Tag Stack{}
        CA0C17A0001DC20D1B2000008847
        No output feature configured
    Per-packet load-sharing


P-2#sh mpls forwarding-table labels 17 detail
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop
tag    tag or VC   or Tunnel Id      switched   interface
17     Pop tag     6.6.6.6/32        125808     Fa0/1      56.56.56.6
        MAC/Encaps=14/14, MRU=1504, Tag Stack{}
        CA0E04F4001DC20D1B2000018847
        No output feature configured
    Per-packet load-sharing


RR-2#sh mpls forwarding-table
Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop
Label      Label      or Tunnel Id     Switched      interface
16         Pop Label  5.5.5.5/32       0             Fa1/1      56.56.56.5
17         16         4.4.4.4/32       0             Fa1/1      56.56.56.5
18         Pop Label  45.45.45.0/24    0             Fa1/1      56.56.56.5
19         Pop Label  7.7.7.7/32       0             Fa1/0      76.76.76.7
20         Pop Label  87.87.87.0/24    0             Fa1/0      76.76.76.7
21         17         8.8.8.8/32       60618         Fa1/0      76.76.76.7
22         17         2.2.2.2/32       62592         Fa1/1      56.56.56.5

RR-2#show mpls forwarding-table labels 21 detail
Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop
Label      Label      or Tunnel Id     Switched      interface
21         17         8.8.8.8/32       124158        Fa1/0      76.76.76.7
        MAC/Encaps=14/18, MRU=1500, Label Stack{17}
        C20F1B200001CA0E04F4001C8847 00011000
        No output feature configured


RR-2#sh bgp ipv4 unicast labels
   Network          Next Hop      In label/Out label
   2.2.2.2/32       4.4.4.4         22/17
   8.8.8.8/32       8.8.8.8         21/imp-null


P-3#sh mpls forwarding-table
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop
tag    tag or VC   or Tunnel Id      switched   interface
16     Pop tag     6.6.6.6/32        64910      Fa0/1      76.76.76.6
17     Pop tag     8.8.8.8/32        62636      Fa0/0      87.87.87.8

P-3#sh mpls forwarding-table labels 17 detail
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop
tag    tag or VC   or Tunnel Id      switched   interface
17     Pop tag     8.8.8.8/32        134673     Fa0/0      87.87.87.8
        MAC/Encaps=14/14, MRU=1504, Tag Stack{}
        CA101C74001DC20F1B2000008847
        No output feature configured
    Per-packet load-sharing


PE-2#sh mpls forwarding-table
Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop
Label      Label      or Tunnel Id     Switched      interface
16         Pop Label  7.7.7.7/32       0             Fa1/1      87.87.87.7
17         Pop Label  76.76.76.0/24    0             Fa1/1      87.87.87.7
18         16         6.6.6.6/32       0             Fa1/1      87.87.87.7
19         No Label   l2ckt(1)         32252         Fa1/0      point2point


PE-1#traceroute 8.8.8.8 source loopback 0
Type escape sequence to abort.
Tracing the route to 8.8.8.8
VRF info: (vrf in name/id, vrf out name/id)
  1 23.23.23.3 [MPLS: Labels 17/22 Exp 0] 1052 msec 1084 msec 440 msec
  2 34.34.34.4 [MPLS: Label 22 Exp 0] 612 msec 1416 msec 1324 msec
  3 45.45.45.5 [MPLS: Labels 17/21 Exp 0] 864 msec 972 msec 604 msec
  4 56.56.56.6 [MPLS: Label 21 Exp 0] 644 msec 1376 msec 1292 msec
  5  *
    76.76.76.7 [MPLS: Label 17 Exp 0] 1136 msec 832 msec
  6 87.87.87.8 1752 msec 1524 msec 1464 msec


CE-1#traceroute 9.9.9.9 source loopback 0

Type escape sequence to abort.
Tracing the route to 9.9.9.9

  1 150.0.0.9 1480 msec 1100 msec 880 msec


P-1#sh ip route 8.8.8.8

% Network not in table
+++++++++++++++++++++++++++++++++++++++++

Stay Tuned For Next Part Of Series as we will dig the UMMT deeper :)

HTH...

Deepak Arora

Evil CCIE

L2TPv3 Interworking - L2 VPN Saga Continues...

R8#sh ip int b | e una|do
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            89.0.0.8        YES NVRAM  up                    up
Loopback0                  8.8.8.8         YES NVRAM  up                    up

R8#sh run | s r o
router ospf 1
 log-adjacency-changes
 network 0.0.0.0 255.255.255.255 area 0


R9#sh ip int b | e una|do
Interface                  IP-Address      OK? Method Status                Protocol
Serial1/0                  89.0.0.9        YES NVRAM  up                    up
Loopback0                  9.9.9.9         YES NVRAM  up                    up

R9#sh run | s r o
router ospf 1
 log-adjacency-changes
 network 0.0.0.0 255.255.255.255 area 0

R9#sh run int s1/0
Building configuration...

Current configuration : 132 bytes
!
interface Serial1/0
 ip address 89.0.0.9 255.255.255.0
 encapsulation ppp
 ip ospf network broadcast
 serial restart-delay 0
end


R2#sh ip int b | e una|do
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            12.0.0.2        YES NVRAM  up                    up
FastEthernet0/1            23.0.0.2        YES NVRAM  up                    up
Loopback0                  2.2.2.2         YES NVRAM  up                    up

R2#sh run | s r e
router eigrp 100
 network 0.0.0.0
 no auto-summary

R2#sh ip ro e
     1.0.0.0/32 is subnetted, 1 subnets
D       1.1.1.1 [90/409600] via 12.0.0.1, 00:10:30, FastEthernet0/0
     3.0.0.0/32 is subnetted, 1 subnets
D       3.3.3.3 [90/409600] via 23.0.0.3, 00:10:10, FastEthernet0/1

R2#sh mpls forwarding
Tag switching is not operational.
CEF or tag switching has not been enabled.
No TFIB currently allocated.


R1#sh run | s pseudo
pseudowire-class L2TPv3
 encapsulation l2tpv3
 interworking ip
 ip local interface Loopback0

R1#sh run int f2/1
Building configuration...

Current configuration : 124 bytes
!
interface FastEthernet2/1
 no ip address
 speed auto
 duplex auto
 no keepalive
 xconnect 3.3.3.3 13 pw-class L2TPv3
end


R3#sh run | s pseudo
pseudowire-class L2TPv3
 encapsulation l2tpv3
 interworking ip
 ip local interface Loopback0

R3#sh run int s1/1
Building configuration...

Current configuration : 122 bytes
!
interface Serial1/1
 no ip address
 encapsulation ppp
 serial restart-delay 0
 xconnect 1.1.1.1 13 pw-class L2TPv3
end


R8#sh ip ospf nei

Neighbor ID     Pri   State           Dead Time   Address         Interface
9.9.9.9           1   FULL/DR         00:00:37    89.0.0.9        FastEthernet0/0

R8#sh ip ro os
     9.0.0.0/32 is subnetted, 1 subnets
O       9.9.9.9 [110/11] via 89.0.0.9, 00:13:00, FastEthernet0/0

R8#ping 9.9.9.9 so lo0

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 9.9.9.9, timeout is 2 seconds:
Packet sent with a source address of 8.8.8.8
.!!!!
Success rate is 80 percent (4/5), round-trip min/avg/max = 88/120/180 ms


R1#sh l2tp tunnel all

L2TP Tunnel Information Total tunnels 1 sessions 1

Tunnel id 1100418086 is up, remote id is 2518749472, 1 active sessions
  Remotely initiated tunnel
  Tunnel state is established, time since change 00:14:48
  Tunnel transport is IP  (115)
  Remote tunnel name is R3
    Internet Address 3.3.3.3, port 0
  Local tunnel name is R1
    Internet Address 1.1.1.1, port 0
  L2TP class for tunnel is l2tp_default_class
  Counters, taking last clear into account:
    111 packets sent, 107 received
    9008 bytes sent, 8752 received
    Last clearing of counters never
  Counters, ignoring last clear:
    111 packets sent, 107 received
    9008 bytes sent, 8752 received
  Control Ns 9, Nr 13
  Local RWS 1024 (default), Remote RWS 1024
  Control channel Congestion Control is disabled
  Tunnel PMTU checking disabled
  Retransmission time 1, max 1 seconds
  Unsent queuesize 0, max 0
  Resend queuesize 0, max 1
  Total resends 0, ZLB ACKs sent 11
  Total out-of-order dropped pkts 0
  Total out-of-order reorder pkts 0
  Total peer authentication failures 0
  Current no session pak queue check 0 of 5
  Retransmit time distribution: 0 0 0 0 0 0 0 0 0
  Control message authentication is disabled


R1#sh l2tun session all

L2TP Session Information Total tunnels 1 sessions 1

Session id 3278375310 is up, logical session id 65537, tunnel id 1100418086
  Remote session id is 1558878854, remote tunnel id 2518749472
  Remotely initiated session
  Unique ID is 1
Session Layer 2 circuit, type is Ethernet, name is FastEthernet2/1
  Session vcid is 13
  Interworking type is IP
  Circuit state is UP
    Local circuit state is UP
    Remote circuit state is UP
Call serial number is 1168000001
Remote tunnel name is R3
  Internet address is 3.3.3.3
Local tunnel name is R1
  Internet address is 1.1.1.1
IP protocol 115
  Session is L2TP signaled
  Session state is established, time since change 00:15:43
    117 Packets sent, 113 received
    9488 Bytes sent, 9232 received
  Last clearing of counters never
  Counters, ignoring last clear:
    117 Packets sent, 113 received
    9488 Bytes sent, 9232 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 ff73b36f 01010101
    03030303 5cea9a86
  Sequencing is off
  Conditional debugging is disabled
  SSM switch id is 4096, SSM segment id is 8193

 Final Config - http://www.4shared.com/rar/T4TwmRG7/Interworking.html 

Further Readings:

http://www.cisco.com/en/US/docs/ios-xml/ios/mp_l2_vpns/configuration/15-2mt/mp-l2vpn-intrntwkg.html#GUID-E774CB40-066C-4B3F-8E1E-BEBCBED1087C

http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/fsinterw.html#wp1057606

http://blog.ine.com/2008/01/28/poor-mans-vpls/


HTH...
Deepak Arora
Evil CCIE

OSPFv2/v3 Over MPLS L2 VPN Using Frame Relay - ATOM

R1
===
!
mpls label protocol ldp
!
mpls ldp router-id Loopback0 force
!
pseudowire-class ATOM
 encapsulation mpls
!
connect ATOM Serial1/0 100 l2transport
 xconnect 3.3.3.3 67 pw-class ATOM
 !
!

R3
===
!
mpls label protocol ldp
!
mpls ldp router-id Loopback0 force
!
pseudowire-class ATOM
 encapsulation mpls
!
connect ATOM Serial1/0 100 l2transport
 xconnect 1.1.1.1 67 pw-class ATOM
 !
!

========================================

R1#sh mpls forwarding
Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop
Label      Label      or Tunnel Id     Switched      interface
16         Pop Label  2.2.2.2/32       0             Fa2/0      12.0.0.2
17         Pop Label  23.0.0.0/24      0             Fa2/0      12.0.0.2
18         17         3.3.3.3/32       0             Fa2/0      12.0.0.2
19         No Label   l2ckt(67)        22782         Se1/0      point2point


R3#sh mpls for
Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop
Label      Label      or Tunnel Id     Switched      interface
16         Pop Label  2.2.2.2/32       0             Fa2/0      23.0.0.2
17         16         1.1.1.1/32       0             Fa2/0      23.0.0.2
18         Pop Label  12.0.0.0/24      0             Fa2/0      23.0.0.2
19         No Label   l2ckt(67)        25768         Se1/0      point2point

R1#sh xconnect all detail
Legend:    XC ST=Xconnect State  S1=Segment1 State  S2=Segment2 State
  UP=Up       DN=Down            AD=Admin Down      IA=Inactive
  SB=Standby  HS=Hot Standby     RV=Recovering      NH=No Hardware
XC ST  Segment 1                         S1 Segment 2                         S2
------+---------------------------------+--+---------------------------------+--
UP     ac   Se1/0:100(FR DLCI)           UP mpls 3.3.3.3:67                   UP
            Interworking: none                   Local  VC label 19
                                                 Remote VC label 19
                                                 pw-class: ATOM


R3#sh xconnect all detail
Legend:    XC ST=Xconnect State  S1=Segment1 State  S2=Segment2 State
  UP=Up       DN=Down            AD=Admin Down      IA=Inactive
  SB=Standby  HS=Hot Standby     RV=Recovering      NH=No Hardware
XC ST  Segment 1                         S1 Segment 2                         S2
------+---------------------------------+--+---------------------------------+--
UP     ac   Se1/0:100(FR DLCI)           UP mpls 1.1.1.1:67                   UP
            Interworking: none                   Local  VC label 19
                                                 Remote VC label 19
                                                 pw-class: ATOM

========================================================================


R6
===

R6#sh run | s ospf|Serial0/0|Loopback0
interface Loopback0
 ip address 6.6.6.6 255.255.255.255
 ipv6 address 2000:6::6/128
 ipv6 ospf 1 area 0
interface Serial0/0
 ip address 67.0.0.6 255.255.255.0
 encapsulation frame-relay
 ip ospf network point-to-point
 ipv6 address 2000:67::6/64
 ipv6 address FE80::6 link-local
 ipv6 ospf network point-to-point
 ipv6 ospf 1 area 0
 clock rate 2000000
 frame-relay map ipv6 FE80::7 200 broadcast
 frame-relay map ip 67.0.0.7 200 broadcast
 frame-relay map ipv6 2000:67::7 200 broadcast
 no frame-relay inverse-arp
router ospf 1
 router-id 6.6.6.6
 log-adjacency-changes
 network 0.0.0.0 255.255.255.255 area 0
ipv6 router ospf 1
 log-adjacency-changes


R7#sh run | s ospf|Serial0/0|Loopback0
interface Loopback0
 ip address 7.7.7.7 255.255.255.255
 ipv6 address 2000:7::7/128
 ipv6 ospf 1 area 0
interface Serial0/0
 ip address 67.0.0.7 255.255.255.0
 encapsulation frame-relay
 ip ospf network point-to-point
 ipv6 address 2000:67::7/64
 ipv6 address FE80::7 link-local
 ipv6 ospf network point-to-point
 ipv6 ospf 1 area 0
 clock rate 2000000
 frame-relay map ipv6 FE80::6 200 broadcast
 frame-relay map ip 67.0.0.6 200 broadcast
 frame-relay map ipv6 2000:67::6 200 broadcast
 no frame-relay inverse-arp
router ospf 1
 router-id 7.7.7.7
 log-adjacency-changes
 network 0.0.0.0 255.255.255.255 area 0
ipv6 router ospf 1
 log-adjacency-changes
================================================

R6#sh ip ospf nei
Neighbor ID     Pri   State           Dead Time   Address         Interface
7.7.7.7           0   FULL/  -        00:00:37    67.0.0.7        Serial0/0
R6#
R6#sh ipv6 ospf nei
Neighbor ID     Pri   State           Dead Time   Interface ID    Interface
7.7.7.7           1   FULL/  -        00:00:33    6               Serial0/0
R6#
R6#sh ip ro os
     7.0.0.0/32 is subnetted, 1 subnets
O       7.7.7.7 [110/65] via 67.0.0.7, 00:22:34, Serial0/0
R6#
R6#sh ipv6 ro os
IPv6 Routing Table - 6 entries
Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP
       U - Per-user Static route
       I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary
       O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
       ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
O   2000:7::7/128 [110/64]
     via FE80::7, Serial0/0
R6#
R6#ping 7.7.7.7 so lo0
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 7.7.7.7, timeout is 2 seconds:
Packet sent with a source address of 6.6.6.6
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 40/64/84 ms
R6#
R6#trace 7.7.7.7 so lo0
Type escape sequence to abort.
Tracing the route to 7.7.7.7
  1 67.0.0.7 100 msec *  96 msec
R6#
R6#ping 2000:7::7 so lo0
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2000:7::7, timeout is 2 seconds:
Packet sent with a source address of 2000:6::6
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 44/61/72 ms
R6#trace 2000:7::7
Type escape sequence to abort.
Tracing the route to 2000:7::7
  1 2000:7::7 80 msec 76 msec 76 msec


HTH...
Deepak Arora
Evil CCIE