AToM and VPLS

Virtual Private LAN Services (VPLS), is basically an extension to a AToM Feature, where in the AToM Feature you can only can emulate P2P interconnection using any technology, where this is the best part, while in the VPLS feature we can emulate the P2M Interconnection, but currently only limited to the Ethernet Technology.

The bad thing about the VPLS is that this technology is hardware related :(, so that is why, this feature is commonly deployed in the Big Routers. But Today I will show you guys how to deploy this two Technology Together using IOS-XR, yes I am fortunate enough to get hands on with the IOS-XR, lets get going

·         Configure AToM to Interconnect UPE11 & UPE13

·         Configure VPLS to Interconnect UPE31 & UPE32

Alright, we now entering the Interesting area here, which I will use IOS-XR to demonstrate the AToM and the VPLS Feature. As we know that the VPLS feature is very hardware specific, it can be done in both IOS or IOS-XR, but in the IOS, the supported platform is 7600 in the time of this writing. Ok let’s go to the scenario one by one

·         Configure AToM to Interconnect UPE11 & UPE13

Both AToM or VPLS in IOS-XR will use the same configuration fashion, where first off we need to define the L2Transport interface or the interface that will become a Attachment Circuit (AC) and then we specified the Targeted LDP inside the L2VPN configuration, which in my opinion is much more granular compare to the regular IOS ;)

NPE-XR1 ! interface GigabitEthernet0/0/0/1  l2transport  ! Commit ! l2vpn !  pw-class PC_ETH11_TO_ETH13   encapsulation mpls   !  !  xconnect group GROUP_ATOM   p2p L2CIRCUIT_TO_XR2    interface GigabitEthernet0/0/0/1    neighbor 2.2.2.2 pw-id 1113     pw-class PC_ETH11_TO_ETH13    !   !  ! Commit NPE-XR2 ! interface GigabitEthernet0/0/0/1  l2transport  ! Commit ! l2vpn  !  pw-class PC_ETH13_TO_ETH11   encapsulation mpls   !  !  xconnect group ATOM   p2p L2CIRCUIT_TO_XR1    interface GigabitEthernet0/0/0/1    neighbor 1.1.1.1 pw-id 1113     pw-class PC_ETH13_TO_ETH11    !   !  ! commit

While in the Customer configuration, which are UPE-11 and UPE-13, the configuration will straight forward

UPE-11 ! interface Loopback0  ip address 11.11.11.11 255.255.255.255 ! interface Vlan1  ip address 192.168.1.11 255.255.255.0 ! router eigrp 1142  network 0.0.0.0  passive-interface FastEthernet0 ! End UPE-13 ! interface Loopback0  ip address 13.13.13.13 255.255.255.255 ! interface Vlan1  ip address 192.168.1.13 255.255.255.0 ! router eigrp 1142  network 0.0.0.0  passive-interface FastEthernet0 ! end

Now, take a look closer to the configuration on both NPE-XR1 and NPE-XR2. NPE-XR1/NPE-XR2 will create an additional MPLS Transport Label for the AToM Interconnection using Circuit Number 1113.

RP/0/RSP1/CPU0:NPE-XR1#show mpls ldp neighbor Tue Mar 26 05:42:51.902 UTC <..SNIP…> Peer LDP Identifier: 2.2.2.2:0   TCP connection: 2.2.2.2:29265 - 1.1.1.1:646   Graceful Restart: No   Session Holdtime: 180 sec   State: Oper; Msgs sent/rcvd: 51/51; Downstream-Unsolicited   Up time: 00:31:27   LDP Discovery Sources:     Targeted Hello (1.1.1.1 -> 2.2.2.2, active)   Addresses bound to this peer:     2.2.2.2          10.0.8.7         20.2.4.2      RP/0/RSP1/CPU0:NPE-XR1#show mpls forwarding Tue Mar 26 05:42:58.261 UTC Local  Outgoing    Prefix             Outgoing     Next Hop        Bytes       Label  Label       or ID              Interface                    Switched    ------ ----------- ------------------ ------------ --------------- ------------ 16000  Pop         PW(2.2.2.2:1113)   Gi0/0/0/1    point2point     311310      16011  Pop         3.3.3.3/32         Te0/1/0/0    20.1.3.3        7407        16012  Unlabelled  20.3.4.0/24        Te0/1/0/0    20.1.3.3        0           16013  3000        4.4.4.4/32         Te0/1/0/0    20.1.3.3        2768        16014  Unlabelled  20.2.4.0/24        Te0/1/0/0    20.1.3.3        0           16015  3002        2.2.2.2/32         Te0/1/0/0    20.1.3.3        300118      RP/0/RSP1/CPU0:NPE-XR1#show l2vpn xconnect brief   Tue Mar 26 05:43:30.188 UTC AToM   Like-to-Like                        UP       DOWN        UNR     Ether                              1          0          0     Total                              1          0          0   Total                                1          0          0 Total: 1 UP, 0 DOWN, 0 UNRESOLVED RP/0/RSP1/CPU0:NPE-XR1#show l2vpn xconnect interface g0/0/0/1 Tue Mar 26 05:43:50.460 UTC Legend: ST = State, UP = Up, DN = Down, AD = Admin Down, UR = Unresolved,         SB = Standby, SR = Standby Ready, (PP) = Partially Programmed XConnect                   Segment 1                       Segment 2                Group      Name       ST   Description            ST       Description            ST    ------------------------   -----------------------------   ----------------------------- GROUP_ATOM L2CIRCUIT_TO_XR2                       UP   Gi0/0/0/1              UP       2.2.2.2         1113   UP    ---------------------------------------------------------------------------------------- RP/0/RSP1/CPU0:NPE-XR1#show l2vpn xconnect summary Tue Mar 26 05:43:23.953 UTC Number of groups: 1 Number of xconnects: 1   Up: 1  Down: 0  Unresolved: 0 Partially-programmed: 0   AC-PW: 1  AC-AC: 0  PW-PW: 0 Monitor-Session-PW: 0 Number of Admin Down segments: 0 Number of MP2MP xconnects: 0   Up 0 Down 0   Advertised: 0 Non-Advertised: 0 Number of CE Connections: 0   Advertised: 0 Non-Advertised: 0 Backup PW:   Configured   : 0   UP           : 0   Down         : 0   Admin Down   : 0   Unresolved   : 0   Standby      : 0   Standby Ready: 0 Backup Interface:   Configured   : 0   UP           : 0   Down         : 0   Admin Down   : 0   Unresolved   : 0   Standby      : 0 RP/0/RSP1/CPU0:NPE-XR1#show l2vpn xconnect detail Tue Mar 26 05:44:12.208 UTC Group GROUP_ATOM, XC L2CIRCUIT_TO_XR2, state is up; Interworking none   AC: GigabitEthernet0/0/0/1, state is up     Type Ethernet     MTU 1500; XC ID 0x40004; interworking none     Statistics:       packets: received 1192, sent 1800       bytes: received 251953, sent 323564   PW: neighbor 2.2.2.2, PW ID 1113, state is up ( established )     PW class PC_ETH11_TO_ETH13, XC ID 0xc0000001     Encapsulation MPLS, protocol LDP     Source address 1.1.1.1     PW type Ethernet, control word disabled, interworking none     PW backup disable delay 0 sec     Sequencing not set     PW Status TLV in use       MPLS         Local                          Remote                              ------------ ------------------------------ -----------------------------       Label        16000                          20005                               Group ID     0x100                          0x4000100                           Interface    GigabitEthernet0/0/0/1         GigabitEthernet0/0/0/1              MTU          1500                           1500                                 Control word disabled                       disabled                            PW type      Ethernet                       Ethernet                            VCCV CV type 0x2                            0x2                                               (LSP ping verification)        (LSP ping verification)             VCCV CC type 0x6                            0x6                                              (router alert label)           (router alert label)                             (TTL expiry)                   (TTL expiry)                        ------------ ------------------------------ -----------------------------     Incoming Status (PW Status TLV):       Status code: 0x0 (Up) in Notification message     Outgoing Status (PW Status TLV):       Status code: 0x0 (Up) in Notification message     MIB cpwVcIndex: 3221225473     Create time: 26/03/2013 05:09:06 (00:35:05 ago)     Last time status changed: 26/03/2013 05:11:24 (00:32:46 ago)     Statistics:       packets: received 1800, sent 1192       bytes: received 323564, sent 251953 RP/0/RSP0/CPU0:NPE-XR2#show mpls ldp neighbor 1.1.1.1 Mon Mar 25 20:19:21.750 UTC Peer LDP Identifier: 1.1.1.1:0   TCP connection: 1.1.1.1:646 - 2.2.2.2:29265   Graceful Restart: No   Session Holdtime: 180 sec   State: Oper; Msgs sent/rcvd: 79/79; Downstream-Unsolicited   Up time: 00:56:09   LDP Discovery Sources:     Targeted Hello (2.2.2.2 -> 1.1.1.1, active)   Addresses bound to this peer:     1.1.1.1          10.0.8.6         20.1.3.1         RP/0/RSP0/CPU0:NPE-XR2#show mpls forwarding Mon Mar 25 20:19:35.445 UTC Local  Outgoing    Prefix             Outgoing     Next Hop        Bytes       Label  Label       or ID              Interface                    Switched     ------ ----------- ------------------ ------------ --------------- ------------ 20000  Pop         4.4.4.4/32         Te0/1/0/0    20.2.4.4        9898        20001  Pop         20.3.4.0/24        Te0/1/0/0    20.2.4.4        0           20002  4000        3.3.3.3/32         Te0/1/0/0    20.2.4.4        0           20003  4002        1.1.1.1/32         Te0/1/0/0    20.2.4.4        914189      20004  4001        20.1.3.0/24        Te0/1/0/0    20.2.4.4        0           20005  Pop         PW(1.1.1.1:1113)   Gi0/0/0/1    point2point     330634 RP/0/RSP0/CPU0:NPE-XR2#show l2vpn xconnect detail            Mon Mar 25 19:57:55.748 UTC Group ATOM, XC L2CIRCUIT_TO_XR1, state is up; Interworking none   AC: GigabitEthernet0/0/0/1, state is up     Type Ethernet     MTU 1500; XC ID 0x840003; interworking none     Statistics:       packets: received 2334, sent 894       bytes: received 417824, sent 204466   PW: neighbor 1.1.1.1, PW ID 1113, state is up ( established )     PW class PC_ETH13_TO_ETH11, XC ID 0xc0000001     Encapsulation MPLS, protocol LDP     Source address 2.2.2.2     PW type Ethernet, control word disabled, interworking none     PW backup disable delay 0 sec     Sequencing not set     PW Status TLV in use       MPLS         Local                          Remote                              ------------ ------------------------------ -----------------------------       Label        20005                          16000                               Group ID     0x4000100                      0x100                               Interface    GigabitEthernet0/0/0/1         GigabitEthernet0/0/0/1              MTU          1500                           1500                                Control word disabled                       disabled                            PW type      Ethernet                       Ethernet                            VCCV CV type 0x2                            0x2                                              (LSP ping verification)        (LSP ping verification)             VCCV CC type 0x6                            0x6                                              (router alert label)           (router alert label)                             (TTL expiry)                   (TTL expiry)                        ------------ ------------------------------ -----------------------------     Incoming Status (PW Status TLV):       Status code: 0x0 (Up) in Notification message     Outgoing Status (PW Status TLV):       Status code: 0x0 (Up) in Notification message     MIB cpwVcIndex: 3221225473     Create time: 25/03/2013 19:23:12 (00:34:42 ago)     Last time status changed: 25/03/2013 19:23:12 (00:34:42 ago)     Statistics:       packets: received 894, sent 2334       bytes: received 204466, sent 417824

On the Customer Side, we can see that the UPE-11 and UPE-13 will form an EIGRP adjacency

UPE-11#show  ip eigrp neighbors EIGRP-IPv4 Neighbors for AS(1142) H   Address                 Interface       Hold Uptime   SRTT   RTO  Q  Seq                                             (sec)         (ms)       Cnt Num 0   192.168.1.13            Vl1               14 01:03:37   10   200  0  7 EIGRP-IPv4 Neighbors for AS(1142) H   Address                 Interface       Hold Uptime   SRTT   RTO  Q  Seq                                             (sec)         (ms)       Cnt Num 1   192.168.1.11            Vl1               11 01:03:45    9   200  0  15

·         Configure VPLS to Interconnect UPE31 & UPE32

AToM is cool, where we can interconnect different L2 technologies, but it is limited to the fact that its Point-to-point connection. While in the Virtual Private LAN Service / VPLS we can do have point-to-multipoint interconnection but it only limited to the Ethernet Technology, currently ant the time of this writing.

The configuration is quite different from the AToM, where in the VPLS we have to define the Virtual Forwarding Instance, and each of the PE should maintain the MAC-Address table from the customer on its CAM.

NPE-XR1 ! interface TenGigE0/1/0/3  description UPE-31  mtu 9216  l2transport  ! ! Commit ! l2vpn  pw-class PC_VPLS   encapsulation mpls    transport-mode ethernet   !  !   !  !  bridge group BG_VPLS   bridge-domain BD_VPLS1    interface TenGigE0/1/0/3    !    vfi VFI_TO_XR2     neighbor 2.2.2.2 pw-id 3132      pw-class PC_VPLS     !    !   !  ! ! commit

NPE-XR2 ! interface TenGigE0/1/0/3  description UPE-32  l2transport  ! ! Commit ! l2vpn  pw-class PC_VPLS   encapsulation mpls    transport-mode ethernet   !  !   !  !  bridge group BG_VPLS   bridge-domain BD_VPLS1    interface TenGigE0/1/0/3    !    neighbor 1.1.1.1 pw-id 3132     pw-class PC_VPLS    !   !  ! ! commit

Note that I do the following on purpose

·         The MTU interface that facing to the UPE-31 on the NPE-XR1 is larger than the MTU that facing to the UPE-32 on the NPE-XR2

·         I didn’t use the VFI on the NPE-XR2, while on the NPE-XR1 I used it

While the configuration on the Customer side is obvious

UPE-31 ! interface Loopback0  ip address 31.31.31.31 255.255.255.255 ! interface Vlan1  ip address 10.0.0.31 255.255.255.0 ! router ospf 1  passive-interface GigabitEthernet0  network 0.0.0.0 255.255.255.255 area 0 ! end

UPE-32 ! interface Loopback0  ip address 32.32.32.32 255.255.255.255 ! interface Vlan1  ip address 10.0.0.32 255.255.255.0 ! router ospf 1  passive-interface GigabitEthernet0  network 0.0.0.0 255.255.255.255 area 0 ! end

Ok, let’s take a look into the verification on NPE-XR1 here

RP/0/RSP1/CPU0:NPE-XR1#show l2vpn bridge-domain brief Tue Mar 26 05:44:22.682 UTC Legend: pp = Partially Programmed. Bridge Group:Bridge-Domain Name  ID    State          Num ACs/up   Num PWs/up -------------------------------- ----- -------------- ------------ ------------- BG_VPLS:BD_VPLS1                 0     up             1/1          1/1          RP/0/RSP1/CPU0:NPE-XR1#show l2vpn bridge-domain summary Tue Mar 26 05:44:29.901 UTC Number of groups: 1, bridge-domains: 1, Up: 1, Shutdown: 0, Partially- programmed: 0 Default: 1, pbb-edge: 0, pbb-core: 0 Number of ACs: 1 Up: 1, Down: 0, Partially-programmed: 0 Number of PWs: 1 Up: 1, Down: 0, Standby: 0, Partially-programmed: 0 RP/0/RSP1/CPU0:NPE-XR1#show l2vpn bridge-domain interface teng0/1/0/3 Tue Mar 26 05:44:40.858 UTC Legend: pp = Partially Programmed. Bridge group: BG_VPLS, bridge-domain: BD_VPLS1, id: 0, state: up, ShgId: 0, MSTi: 0   Aging: 300 s, MAC limit: 4000, Action: none, Notification: syslog   Filter MAC addresses: 0   ACs: 1 (1 up), VFIs: 1, PWs: 1 (1 up), PBBs: 0 (0 up)   List of ACs:     Te0/1/0/3, state: up, Static MAC addresses: 0 RP/0/RSP1/CPU0:NPE-XR1#show l2vpn bridge-domain detail               Tue Mar 26 05:44:53.209 UTC Legend: pp = Partially Programmed. Bridge group: BG_VPLS, bridge-domain: BD_VPLS1, id: 0, state: up, ShgId: 0, MSTi: 0   Coupled state: disabled   MAC learning: enabled   MAC withdraw: enabled     MAC withdraw for Access PW: enabled     MAC withdraw sent on bridge port down: disabled   Flooding:     Broadcast & Multicast: enabled     Unknown unicast: enabled   MAC aging time: 300 s, Type: inactivity   MAC limit: 4000, Action: none, Notification: syslog   MAC limit reached: no   MAC port down flush: enabled   MAC Secure: disabled, Logging: disabled   Split Horizon Group: none   Dynamic ARP Inspection: disabled, Logging: disabled   IP Source Guard: disabled, Logging: disabled   DHCPv4 snooping: disabled   IGMP Snooping profile: none   Bridge MTU: 1500   MIB cvplsConfigIndex: 1   Filter MAC addresses:   Create time: 26/03/2013 05:25:46 (00:19:06 ago)   No status change since creation   ACs: 1 (1 up), VFIs: 1, PWs: 1 (1 up), PBBs: 0 (0 up)   List of ACs:     AC: TenGigE0/1/0/3, state is up       Type Ethernet       MTU 9202; XC ID 0x440001; interworking none       MAC learning: enabled       Flooding:         Broadcast & Multicast: enabled         Unknown unicast: enabled       MAC aging time: 300 s, Type: inactivity       MAC limit: 4000, Action: none, Notification: syslog       MAC limit reached: no       MAC port down flush: enabled       MAC Secure: disabled, Logging: disabled       Split Horizon Group: none       Dynamic ARP Inspection: disabled, Logging: disabled       IP Source Guard: disabled, Logging: disabled       DHCPv4 snooping: disabled       IGMP Snooping profile: none       Storm Control: disabled       Static MAC addresses:       Statistics:         packets: received 2388, sent 1762         bytes: received 483060, sent 286345       Storm control drop counters:         packets: broadcast 0, multicast 0, unknown unicast 0         bytes: broadcast 0, multicast 0, unknown unicast 0       Dynamic ARP inspection drop counters:         packets: 0, bytes: 0       IP source guard drop counters:         packets: 0, bytes: 0   List of Access PWs:   List of VFIs:     VFI VFI_TO_XR2 (up)       PW: neighbor 2.2.2.2, PW ID 3132, state is up ( established )         PW class PC_VPLS, XC ID 0xc0000002         Encapsulation MPLS, protocol LDP         Source address 1.1.1.1         PW type Ethernet, control word disabled, interworking none         PW backup disable delay 0 sec         Sequencing not set         PW Status TLV in use           MPLS         Local                          Remote                                   ------------ ------------------------------ -------------------------           Label        16001                          20006                                   Group ID     0x0                            0x0                                      Interface    VFI_TO_XR2                     Access PW                               MTU          1500                           1500                                    Control word disabled                       disabled                                 PW type      Ethernet                       Ethernet                                VCCV CV type 0x2                            0x2                                                  (LSP ping verification)        (LSP ping verification)                 VCCV CC type 0x6                            0x6                                                  (router alert label)           (router alert label)                                 (TTL expiry)                   (TTL expiry)                            ------------ ------------------------------ -------------------------         Incoming Status (PW Status TLV):           Status code: 0x0 (Up) in Notification message         MIB cpwVcIndex: 3221225474         Create time: 26/03/2013 05:40:23 (00:04:29 ago)         Last time status changed: 26/03/2013 05:40:23 (00:04:29 ago)         MAC withdraw message: send 0 receive 0         Static MAC addresses:         Statistics:           packets: received 227, sent 97           bytes: received 35113, sent 27279       DHCPv4 snooping: disabled       IGMP Snooping profile: none       VFI Statistics:         drops: illegal VLAN 0, illegal length 0 RP/0/RSP1/CPU0:NPE-XR1#show mpls forwarding Tue Mar 26 06:23:20.716 UTC Local  Outgoing    Prefix             Outgoing     Next Hop        Bytes       Label  Label       or ID              Interface                    Switched    ------ ----------- ------------------ ------------ --------------- ------------ 16000  Pop         PW(2.2.2.2:1113)   Gi0/0/0/1    point2point     707971      16001  Pop         PW(2.2.2.2:3132)   BD=0         point2point     342957      16011  Pop         3.3.3.3/32         Te0/1/0/0    20.1.3.3        11893       16012  Unlabelled  20.3.4.0/24        Te0/1/0/0    20.1.3.3        0            16013  3000        4.4.4.4/32         Te0/1/0/0    20.1.3.3        2768        16014  Unlabelled  20.2.4.0/24        Te0/1/0/0    20.1.3.3        0           16015  3002        2.2.2.2/32         Te0/1/0/0    20.1.3.3        800148

Here are the verification on the NPE-XR2

RP/0/RSP0/CPU0:NPE-XR2#show l2vpn bridge-domain summary Mon Mar 25 19:58:10.015 UTC Number of groups: 1, bridge-domains: 1, Up: 1, Shutdown: 0, Partially- programmed: 0 Default: 1, pbb-edge: 0, pbb-core: 0 Number of ACs: 1 Up: 1, Down: 0, Partially-programmed: 0 Number of PWs: 1 Up: 1, Down: 0, Standby: 0, Partially-programmed: 0 RP/0/RSP0/CPU0:NPE-XR2# RP/0/RSP0/CPU0:NPE-XR2#show l2vpn bridge-domain brief   Mon Mar 25 19:58:16.658 UTC Legend: pp = Partially Programmed. Bridge Group:Bridge-Domain Name  ID    State          Num ACs/up   Num PWs/up -------------------------------- ----- -------------- ------------ ------------- BG_VPLS:BD_VPLS1                 0     up             1/1          1/1          RP/0/RSP0/CPU0:NPE-XR2#show l2vpn bridge-domain interface teng0/1/0/3 Mon Mar 25 19:58:25.344 UTC Legend: pp = Partially Programmed. Bridge group: BG_VPLS, bridge-domain: BD_VPLS1, id: 0, state: up, ShgId: 0, MSTi: 0   Aging: 300 s, MAC limit: 4000, Action: none, Notification: syslog   Filter MAC addresses: 0   ACs: 1 (1 up), VFIs: 0, PWs: 1 (1 up), PBBs: 0 (0 up)   List of ACs:     Te0/1/0/3, state: up, Static MAC addresses: 0 RP/0/RSP0/CPU0:NPE-XR2#show l2vpn bridge-domain detail               Mon Mar 25 19:58:42.810 UTC Legend: pp = Partially Programmed. Bridge group: BG_VPLS, bridge-domain: BD_VPLS1, id: 0, state: up, ShgId: 0, MSTi: 0   Coupled state: disabled   MAC learning: enabled   MAC withdraw: enabled     MAC withdraw for Access PW: enabled     MAC withdraw sent on bridge port down: disabled   Flooding:     Broadcast & Multicast: enabled     Unknown unicast: enabled   MAC aging time: 300 s, Type: inactivity   MAC limit: 4000, Action: none, Notification: syslog   MAC limit reached: no   MAC port down flush: enabled   MAC Secure: disabled, Logging: disabled   Split Horizon Group: none   Dynamic ARP Inspection: disabled, Logging: disabled   IP Source Guard: disabled, Logging: disabled   DHCPv4 snooping: disabled   IGMP Snooping profile: none   Bridge MTU: 1500   MIB cvplsConfigIndex: 1   Filter MAC addresses:   Create time: 25/03/2013 19:39:17 (00:19:25 ago)   No status change since creation   ACs: 1 (1 up), VFIs: 0, PWs: 1 (1 up), PBBs: 0 (0 up)   List of ACs:     AC: TenGigE0/1/0/3, state is up       Type Ethernet       MTU 1500; XC ID 0xc40001; interworking none       MAC learning: enabled       Flooding:         Broadcast & Multicast: enabled         Unknown unicast: enabled       MAC aging time: 300 s, Type: inactivity       MAC limit: 4000, Action: none, Notification: syslog       MAC limit reached: no       MAC port down flush: enabled       MAC Secure: disabled, Logging: disabled       Split Horizon Group: none       Dynamic ARP Inspection: disabled, Logging: disabled       IP Source Guard: disabled, Logging: disabled       DHCPv4 snooping: disabled       IGMP Snooping profile: none       Storm Control: disabled       Static MAC addresses:       Statistics:         packets: received 3090, sent 1331         bytes: received 539521, sent 272523       Storm control drop counters:         packets: broadcast 0, multicast 0, unknown unicast 0         bytes: broadcast 0, multicast 0, unknown unicast 0       Dynamic ARP inspection drop counters:         packets: 0, bytes: 0       IP source guard drop counters:         packets: 0, bytes: 0   List of Access PWs:     PW: neighbor 1.1.1.1, PW ID 3132, state is up ( established )       PW class PC_VPLS, XC ID 0xc0000002       Encapsulation MPLS, protocol LDP       Source address 2.2.2.2       PW type Ethernet, control word disabled, interworking none       PW backup disable delay 0 sec       Sequencing not set       PW Status TLV in use         MPLS         Local                          Remote                                ------------ ------------------------------ ---------------------------         Label        20006                          16001                                 Group ID     0x0                            0x0                                   Interface    Access PW                      VFI_TO_XR2                            MTU          1500                           1500                                  Control word disabled                       disabled                              PW type      Ethernet                       Ethernet                              VCCV CV type 0x2                            0x2                                                (LSP ping verification)        (LSP ping verification)               VCCV CC type 0x6                            0x6                                                (router alert label)           (router alert label)                               (TTL expiry)                   (TTL expiry)                          ------------ ------------------------------ ---------------------------       Incoming Status (PW Status TLV):         Status code: 0x0 (Up) in Notification message       MIB cpwVcIndex: 3221225474       Create time: 25/03/2013 19:39:17 (00:19:25 ago)       Last time status changed: 25/03/2013 19:52:11 (00:06:31 ago)       MAC withdraw message: send 1 receive 0       Static MAC addresses:       Statistics:         packets: received 395, sent 957         bytes: received 114344, sent 149000       Storm control drop counters:         packets: broadcast 0, multicast 0, unknown unicast 0         bytes: broadcast 0, multicast 0, unknown unicast 0       MAC learning: enabled       Flooding:         Broadcast & Multicast: enabled         Unknown unicast: enabled       MAC aging time: 300 s, Type: inactivity       MAC limit: 4000, Action: none, Notification: syslog       MAC limit reached: no       MAC port down flush: enabled       MAC Secure: disabled, Logging: disabled       Split Horizon Group: none       DHCPv4 snooping: disabled       IGMP Snooping profile: none       Storm Control: disabled   List of VFIs: RP/0/RSP0/CPU0:NPE-XR2#show mpls forwarding Mon Mar 25 20:36:46.511 UTC Local  Outgoing    Prefix             Outgoing     Next Hop        Bytes       Label  Label       or ID              Interface                    Switched    ------ ----------- ------------------ ------------ --------------- ------------ 20000  Pop         4.4.4.4/32         Te0/1/0/0    20.2.4.4        11800       20001  Pop         20.3.4.0/24        Te0/1/0/0    20.2.4.4        0           20002  4000        3.3.3.3/32         Te0/1/0/0    20.2.4.4        0           20003  4002        1.1.1.1/32         Te0/1/0/0    20.2.4.4        1229545     20004  4001        20.1.3.0/24        Te0/1/0/0    20.2.4.4        0           20005  Pop         PW(1.1.1.1:1113)   Gi0/0/0/1    point2point     430640      20006  Pop         PW(1.1.1.1:3132)   BD=0         point2point     346714

Based on the verification above, it seems that the IOS-XR automatically decrease the MTU that facing to the Customer Interface to be 1500. and also eventhough I didn’t specify the VFI on the NPE-XR2, it seems that the VPLS adjacency between NPE-XR1 and NPE-XR2 still become UP ;)

Ok, now we expect that the Customer, UPE-31 & UPE-32, will having the OSPF adjacency established

UPE-31#show ip ospf neighbor Neighbor ID     Pri   State           Dead Time   Address         Interface 10.0.8.162        1   FULL/DR         00:00:31    10.0.0.32       Vlan1 UPE-32#show ip ospf neighbor Neighbor ID     Pri   State           Dead Time   Address         Interface 31.31.31.31       1   FULL/BDR        00:00:36    10.0.0.31       Vlan1

well In this example, I only emulate two routers that connect to the VPLS, due to the Lab hardware limitation, in term of Device Quantity, but if we add additional device on the CE side, it is obvious that this new Device will eventually reside on the same Broadcast Domain ;)

well I hope this have been informative, and I'd like to thank you for reading ;)