The PPPoE over L2TPv3 feature allows you to establish PPPoE sessions for incoming traffic using Layer 2 Tunneling Protocol Version 3 (L2TPv3) IPv6 tunnels. An L2TPv3 over IPv6 tunnel is a static/stateless P2P overlay tunnel between a physical edge/aggregation router and its peer entity. The peer entity is typically a virtual Broadband Network Gateway (vBNG), Virtual Network Function (VNF). The L2TPv3 tunnel transports ethernet traffic to and from CPEs. Each CPE is connected to an Access Node Optical Line Terminal(OLT)/Digital Subscriber Line Access Multiplexer(DSLAM).

Point-to-Point Protocol over Ethernet (PPPoE)—protocol describing the encapsulation of PPP frames inside ethernet frames and tunneling packets over Digital Subscriber Lines (DSLs) to Internet Service Providers (ISPs).

L2TPv3 Tunnel Interface—logical interface for terminating Broadband Subscriber Layer 2 Ethernet attachment circuits (port/VLAN) from access or edge routers over an IPv6 network with L2TPv3 encapsulation for BNG services. For further information, see IETF RFC8159.

The difference between the situation before and after the introduction of PPPoE sessions for L2TPv3 tunnels is shown in Figures 1 and 2 in: Overview of PPPoE over L2TPv3 Tunnels—Example Topology.

You can use Point-to-Point Protocol over Ethernet (PPPoE) sessions via EoL2TPv3oIPv6 tunnels to deliver the same functions as those described in: How to Enable and Configure PPPoE on Ethernet.

The PPPoE sessions used by this feature have the following key characteristics:

• H-QoS shaper per-session

• In/Out Access Control Lists (ACLs)

• Dual Stack

• Ingress QoS Policing

• Unicast Reverse Path Forwarding (uRPF)

• Lawful Intercept (LI)—both Radius & SNMP-based

• Session termination in VRF

The scope of a vBNG on a static/stateless P2P EoL2TPv3oIPv6 overlay tunnel includes:

• An EoL2TPv3oIPv6 overlay tunnel with and without VLAN tags:

  • Plain ethernet traffic OR

  • Dot1Q (Single VLAN tagged)

• All applicable features/functionality that are currently supported on physical interfaces for PPPoE sessions:

  • PTA (locally terminated) or LAC (forwarded to LNS over L2TPv2oIPv4)

  • IPv4 IPoE session (Note: IPv4 only)

  • Session authentication/authorization, policy enforcement, accounting and an AAA/RADIUS interface. These all function in the same way as currently supported on physical interfaces for PPPoE sessions

  • Only session-level QoS—as currently supported for PPPoE sessions.

  • For PPPoE PTA sessions:

    • Per-session in and out ACLs

    • VRF mapping

The effect of using this feature can be simply shown by looking at example topologies before and after this feature was introduced. Figure 1 shows an example topology using a traditional BNG architecture. This example uses two BNGs for three CPEs. Figure 2 shows an example of the BNG architecture using this feature, which only uses one vBNG for three CPEs.

Figure 1. Traditional BNG Architecture

Figure 2. PPPoE over L2TPv3 Tunnels to vBNG

A benefit of this feature is that a Broadband Network Gateway(BNG) can be placed in each data center, instead of at each point of presence(PoP). An ISP can use L2TPv3 tunneling to send dual-stack PPP packets across its own IPv6 backbone network for a PPP Terminated Aggregation (PTA) session or a L2TP Access Concentrator (LAC) session.

Software Prerequisites:

• Currently only supported on a Cisco CSR 1000v VM. This virtual router requires at least 2 CPUs, 8GB RAM or above, and 2 or more (vNIC) interfaces (10Gb).

• Q-in-Q tunneling is not supported

• Tunnel H-QoS is not supported

• Access Node Control Protocol (ANCP) is not supported

• IPoE sessions are not supported (only PPPoE sessions are supported)

• Netconf/Yang Model is not supported

• We recommend using a physical interface/subinterface as the tunnel source instead of a loopback interface, to support session-level QoS Queuing or Shaping

• High Availability (HA) is not supported

• This feature does not support any PPPoE feature under the tunnel interface except for PPPoE enable function.

• A VLAN range under the tunnel is not supported

• MIB is not supported

• The size of the secondary local cookie must equal the size of the primary local cookie

• If a PPPoE session is up, the following actions are not allowed:

  • Removal of the tunnel mode

  • Removal of remote cookies

  • Modification or removal of tunnel parameters is not allowed, but removal of local cookies is allowed.

The figure below summarizes the call flows for PPPoE over an L2TPv3oIPv6 tunnel. Call flows are also explained here: PPP and L2TP Flow Summary. For Cisco IOS XE Fuji 16.7, PPPoE is supported. (IPoE is not supported.)

The following extended NAS-Port-Types are currently defined for a PPPoE service on ethernet and ATM interfaces.

• PPPoA—Radius value 30

• PPPoEoA—Radius value 31

• PPPoEoE—Radius value 3

• PPPoEoVLAN—Radius value 33

• PPPoEoQinQ—Radius value 34

In this feature, PPPoE support is added to the virtual interface (tunnel), which requires a new NAS-Port-Type for the PPPoE service on a virtual interface.

The following extended NAS-Port-Types were introduced for RFC2516, and which support the PPPoE service on virtual interfaces are supported:

• VirtualPPPoEoE (PPP over Ethernet [RFC2516] over Ethernet over tunnel/pseudowire) – Radius Value 44

• VirtualPPPoEoVLAN (PPP over Ethernet [RFC2516] over VLAN tunnel/pseudowire) – Radius Value 45

(The following extended NAS-Port-Type, introduced for RFC2516, is not supported: VirtualPPPoEoQinQ (PPP over Ethernet [RFC2516] over IEEE 802.1QinQ tunnel/pseudowire) – Radius Value 46.)

Figure 3 below is an overview of the network topology. Traffic from CPE1 and CPE2 uses PPPoE sessions and EoL2TPv3oIPv6 tunnels to a vBNG in the data center. For each OLT/VLAN, a static EoL2TPv3oIPv6 tunnel is provisioned between an Edge or Aggregation Router and the vBNG on a Cisco CSR 1000v. The Edge/Agg Router forwards ethernet traffic from CPEs through EoL2TPv3oIPv6 tunnels.

To configure PPPoE over L2TPv3 tunnels perform the following configuration tasks:

• Configuring the Edge Router

• Configuring the vSwitch

• Verifying the vSwitch

• Configuring Radius Authentication for PPPoE over L2TPv3 Tunnels

• Configuring vBNG on the Cisco CSR 1000v VM

• Configuring PPPoE over L2TPv3 Tunnels on the Cisco CSR 1000v

• Verifying PPPoE Sessions

• Verifying PPPoE over L2TPv3 Tunnels

• Troubleshooting PPPoE over L2TPv3 Tunnels

The following example shows the configuration of the edge router (for example, a Cisco ASR 9000) at the start of the L2TPv3 tunnel that extends from this router through the backbone network to an x86 server in the data center.

RP/0/RSP0/CPU0:ASR9K# show running-configuration

Thu Oct 19 02:04:51.459 UTC
Building configuration...
!! IOS XR Configuration 5.1.1.11I
!! Last configuration change at Thu Oct 12 15:29:01 2017 by lab
!
hostname ASR9K
logging console debugging
logging buffered 10000000
tftp vrf default ipv4 server homedir disk0:
cdp
cdp log adjacency changes
cdp advertise v1
line console
 timeout login response 0
 exec-timeout 0 0
 stopbits 1
 session-timeout 0
!
onep
!
tftp client source-interface MgmtEth0/RSP0/CPU0/0
ipv4 access-list 1
 10 permit ipv4 30.1.1.0/24 any
!
interface MgmtEth0/RSP0/CPU0/0
 cdp
 ipv4 address 9.45.102.62 255.255.0.0
!
interface MgmtEth0/RSP0/CPU0/1
 cdp
 shutdown
!
interface TenGigE0/0/0/0
 ipv4 address 10.1.1.2 255.255.255.0
 transceiver permit pid all
!
interface TenGigE0/0/0/0.401 l2transport
 encapsulation dot1q 401
!
interface TenGigE0/0/0/0.402 l2transport
 encapsulation dot1q 402
!
<for brevity, the interface commands from
interface TenGigE0/0/0/0.403 l2transport
to 
interface TenGigE0/0/0/0.440 l2transport
 have been removed>

interface TenGigE0/0/0/1
 ipv4 address 20.1.1.1 255.255.255.0
 ipv6 address 1111:2222::abcd/64
 ipv6 enable
 transceiver permit pid all
!
interface TenGigE0/0/0/2
 ipv4 address 30.1.1.2 255.255.255.0
!
interface TenGigE0/0/0/3
 ipv4 address 40.1.1.1 255.255.255.0
!
interface preconfigure GigabitEthernet0/0/0/12
 ipv4 address 1.1.2.13 255.255.255.0
 shutdown
 transceiver permit pid all
!
interface preconfigure GigabitEthernet0/0/0/13
 ipv4 address 1.1.2.14 255.255.255.0
 shutdown
 transceiver permit pid all
!

<for brevity, some interface commands have been removed>

interface preconfigure GigabitEthernet0/0/0/19
 description test
 ipv4 address 2.2.2.5 255.255.255.0
 shutdown
 transceiver permit pid all
!
interface preconfigure GigabitEthernet0/0/1/0
 ipv4 address 1.1.2.20 255.255.255.0
 shutdown
 transceiver permit pid all
!
interface preconfigure GigabitEthernet0/0/1/1
 description test-pub-sub
 ipv4 address 1.1.2.21 255.255.255.0
 shutdown
 transceiver permit pid all
!
interface preconfigure GigabitEthernet0/0/1/2
 ipv4 address 1.1.2.22 255.255.255.0
 shutdown
 transceiver permit pid all
!

<for brevity, some interface commands have been removed>


interface preconfigure GigabitEthernet0/0/1/19
 ipv4 address 10.64.67.24 255.255.255.0
 shutdown
 transceiver permit pid all
!
interface preconfigure GigabitEthernet0/1/0/0
 service-policy input ariadne
 service-policy output ariadne
 ipv4 address 1.1.1.1 255.255.255.0
 ipv4 access-group ariadne-demo-phase2 ingress
!
interface preconfigure GigabitEthernet0/1/0/1
 ipv4 address 10.2.2.5 255.255.255.0
 shutdown
!
interface preconfigure GigabitEthernet0/1/0/2
 ipv4 address 10.3.3.5 255.255.255.0
!
interface preconfigure GigabitEthernet0/1/0/3
 ipv4 address 10.4.4.5 255.255.255.0
!
interface preconfigure GigabitEthernet0/1/0/4
 shutdown
!
<for brevity, the interface configuration commands from 
interface preconfigure GigabitEthernet0/1/0/4 
to 
interface preconfigure GigabitEthernet0/2/1/19 
have been removed>

shutdown
!
router static
 address-family ipv4 unicast
  1.1.0.0/16 30.1.1.1
  10.64.67.0/24 40.1.1.2
  50.1.1.0/24 40.1.1.2
  202.153.144.25/32 9.45.0.1
 !
 address-family ipv6 unicast
  1111:2222::cdef/128 TenGigE0/0/0/1
 !
!
l2vpn
 pw-class test
  encapsulation l2tpv3
   protocol l2tpv3
  !
 !
 xconnect group test1
  p2p test1
   interface TenGigE0/0/0/0.401
   neighbor ipv6 1111:2222::cdef pw-id 1
    pw-class test1
    source 1111:1101::abcd
    l2tp static
     local cookie size 8 value 0x4 0x4
     local session 1
     remote cookie size 8 value 0x4 0x4
     remote session 1
    !
   !
  !
 !
<for brevity, the commands from
xconnect group test2 
to
xconnect group test40
have been removed>

To configure a Vector Packet Processing (VPP) vSwitch, which forwards L2TPv6 packets on the x86 server, edit the startup.conf file as shown in the following example. This allows the connection of physical NICs to vBNGs in the VMs.

root@vbng:~# more /etc/vpp/startup.conf 
unix {
  nodaemon
  cli-listen localhost:5002
  log /tmp/vpp.log
  full-coredump
}
cpu {
        ## In the VPP there is one main thread and optionally the user can create worker(s)
        ## The main thread and worker thread(s) can be pinned to CPU core(s) manually or automatically
        ## Manual pinning of thread(s) to CPU core(s)
        ## Set logical CPU core where main thread runs
         main-core 2
        ## Set logical CPU core(s) where worker threads are running
        corelist-workers 3,6 
        ## Automatic pinning of thread(s) to CPU core(s)
        ## Sets number of CPU core(s) to be skipped (1 ... N-1)
        ## Skipped CPU core(s) are not used for pinning main thread and working thread(s).
        ## The main thread is automatically pinned to the first available CPU core and worker(s)
        ## are pinned to next free CPU core(s) after core assigned to main thread
        # skip-cores 4
        ## Specify a number of workers to be created
        ## Workers are pinned to N consecutive CPU cores while skipping "skip-cores" CPU core(s)
        ## and main thread's CPU core
        # workers 2
        ## Set scheduling policy and priority of main and worker threads
        ## Scheduling policy options are: other (SCHED_OTHER), batch (SCHED_BATCH)
        ## idle (SCHED_IDLE), fifo (SCHED_FIFO), rr (SCHED_RR)
        # scheduler-policy fifo
        ## Scheduling priority is used only for "real-time policies (fifo and rr),
        ## and has to be in the range of priorities supported for a particular policy
        # scheduler-priority 50
}
dpdk {
        ## Change default settings for all intefaces
        # dev default {
                ## Number of receive queues, enables RSS
                ## Default is 1
                # num-rx-queues 3
                ## Number of transmit queues, Default is equal
                ## to number of worker threads or 1 if no workers treads
                # num-tx-queues 3
                ## Number of descriptors in transmit and receive rings
                ## increasing or reducing number can impact performance
                ## Default is 1024 for both rx and tx
                # num-rx-desc 512
                # num-tx-desc 512
                ## VLAN strip offload mode for interface
                ## Default is off
                # vlan-strip-offload on
        # }
        ## Whitelist specific interface by specifying PCI address
        # dev 0000:02:00.0
        no-multi-seg
        socket-mem 8192,8192
        uio-driver igb_uio
        dev 0000:43:00.0
        dev 0000:43:00.1 
        ## Whitelist specific interface by specifying PCI address and in
        ## addition specify custom parameters for this interface
        # dev 0000:02:00.1 {
        #       num-rx-queues 2
        # }
        ## Change UIO driver used by VPP, Options are: igb_uio, vfio-pci
        ## and uio_pci_generic (default)
        # uio-driver vfio-pci
        ## Disable mutli-segment buffers, improves performance but
        ## disables Jumbo MTU support
        # no-multi-seg
        ## Increase number of buffers allocated, needed only in scenarios with
        ## large number of interfaces and worker threads. Value is per CPU socket.
        ## Default is 16384
        # num-mbufs 128000
        ## Change hugepages allocation per-socket, needed only if there is need for
        ## larger number of mbufs. Default is 256M on each detected CPU socket
        # socket-mem 2048,2048
}
api-trace {
  on
}
api-segment {
  gid vpp
}
# Adjusting the plugin path depending on where the VPP plugins are:
#plugins
#{
#       path /home/bms/vpp/build-root/install-vpp-native/vpp/lib64/vpp_plugins
#}
# Alternate syntax to choose plugin path
#plugin_path /home/bms/vpp/build-root/install-vpp-native/vpp/lib64/vpp_plugins
root@vbng:~# 

root@gordian:~# telnet localhost 5002
Trying ::1...
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.

vpp#
vpp# show interfaces            Name       Idx     State          Counter          Count    
TenGigabitEthernet48/0/0          1        down     
TenGigabitEthernet51/0/0          2        down     
local0                            0        down     
vpp#
 
 
 
 

 
     vpp# create vhost socket /tmp/vhost-user-vm1-int1
     VirtualEthernet0/0/0
     vpp#
     vpp# set interface state VirtualEthernet0/0/0 up
     vpp# set interface l2 bridge VirtualEthernet0/0/0 1
 
     vpp# set interface state TenGigabitEthernet51/0/0 up
     vpp# set interface l2 bridge TenGigabitEthernet51/0/0 2
     vpp# create vhost socket /tmp/vhost-user-vm1-int2
     VirtualEthernet0/0/1
     vpp#
     vpp# set interface state VirtualEthernet0/0/1 up
     vpp# set interface l2 bridge VirtualEthernet0/0/1 2

Configure VPP on the backbone network side:

     vpp# set interface state TenGigabitEthernet51/0/0 up
     vpp# set interface l2 bridge TenGigabitEthernet51/0/0 2
     vpp# create vhost socket /tmp/vhost-user-vm1-int2
     VirtualEthernet0/0/1
     vpp#
     vpp# set interface state VirtualEthernet0/0/1 up
     vpp# set interface l2 bridge VirtualEthernet0/0/1 2

Verify the vSwitch configuration using the show interface command as shown in the following example. This includes an incoming physical interface (pNIC) on the x86 server TenGigabitEthernet43/0/0. The corresponding virtual interface on the vSwitch is VirtualEthernet0/0/0.

vpp# show interface
              Name               Idx       State          Counter          Count     
TenGigabitEthernet43/0/0          1         up       rx packets            3750503475
                                                     rx bytes           3999648912124
                                                     tx packets            6441344996
                                                     tx bytes           7212168652537
                                                     drops                      66263
TenGigabitEthernet43/0/1          2         up       rx packets            8058785942
                                                     rx bytes           8503746413545
                                                     tx packets            3074652529
                                                     tx bytes           2909632140685
                                                     tx-error                      49
VirtualEthernet0/0/0              3         up       rx packets            6441344996
                                                     rx bytes           7212168652537
                                                     tx packets            3750437212
                                                     tx bytes           3999640288634
                                                     drops                     251663
                                                     tx-error                   66263
VirtualEthernet0/0/1              4         up       rx packets            3074652578
                                                     rx bytes           2909632143625
                                                     tx packets            8058785942
                                                     tx bytes           8503746413545
                                                     drops                    1460666
local0                            0        down      

vpp#

Perform the following show running-configuration command to verify the configurations that were previously made in Configuring the vSwitch.

vpp# show running-configuration

Thread 0 vpp_main (lcore 2)
Time 1340274.6, average vectors/node 0.00, last 128 main loops 0.00 per node 0.00
  vector rates in 0.0000e0, out 0.0000e0, drop 0.0000e0, punt 0.0000e0
             Name                 State         Calls          Vectors        Suspends         Clocks       Vectors/Call  
acl-plugin-fa-cleaner-process  event wait                0               0               1          3.83e4            0.00
admin-up-down-process          event wait                0               0               1          1.60e4            0.00
api-rx-from-ring                 active                  0               0           68709          1.82e4            0.00
bfd-process                    event wait                0               0               1          2.97e4            0.00
cdp-process                     any wait                 0               0          478747          2.11e3            0.00
dhcp-client-process             any wait                 0               0           13401          1.13e4            0.00
dpdk-ipsec-process                done                   1               0               0          1.74e5            0.00
dpdk-process                    any wait                 0               0          446669          4.05e5            0.00
fib-walk                        any wait                 0               0          670044          4.35e3            0.00
flow-report-process             any wait                 0               0               1          2.52e4            0.00
flowprobe-timer-process         any wait                 0               0               1          6.17e4            0.00
gmon-process                    time wait                0               0          268018          4.33e3            0.00
ikev2-manager-process           any wait                 0               0         1340090          4.09e3            0.00
ioam-export-process             any wait                 0               0               1          4.51e4            0.00
ip6-icmp-neighbor-discovery-ev  any wait                 0               0         1340090          3.59e3            0.00
l2fib-mac-age-scanner-process  event wait                0               0               1          1.51e4            0.00
lisp-retry-service              any wait                 0               0          670044          5.42e3            0.00
lldp-process                   event wait                0               0               1          2.71e6            0.00
memif-process                  event wait                0               0               1          2.59e5            0.00
nat64-expire-walk                 done                   1               0               0          7.21e4            0.00
send-garp-na-process           event wait                0               0               1          1.21e4            0.00
snat-det-expire-walk              done                   1               0               0          4.20e4            0.00
startup-config-process            done                   1               0               1          1.99e4            0.00
udp-ping-process                any wait                 0               0               1          7.34e4            0.00
unix-epoll-input                 polling        2516699421               0               0          1.17e6            0.00
vhost-user-process              any wait                 0               0          446683          1.09e4            0.00
vhost-user-send-interrupt-proc  any wait                 0               0               1          1.16e4            0.00
vpe-link-state-process         event wait                0               0              63          5.59e3            0.00
vpe-oam-process                 any wait                 0               0          656907          3.59e3            0.00
vpe-route-resolver-process      any wait                 0               0           13401          1.09e4            0.00
vxlan-gpe-ioam-export-process   any wait                 0               0               1          4.14e4            0.00
---------------
Thread 1 vpp_wk_0 (lcore 3)
Time 1340274.6, average vectors/node 2.29, last 128 main loops 0.00 per node 0.00
  vector rates in 7.6043e3, out 7.6042e3, drop 4.9439e-2, punt 0.0000e0
             Name                 State         Calls          Vectors        Suspends         Clocks       Vectors/Call  
TenGigabitEthernet43/0/0-outpu   active         1033884260      6441345157               0          2.48e1            6.23
TenGigabitEthernet43/0/0-tx      active         1033884260      6441345157               0          1.07e2            6.23
VirtualEthernet0/0/0-output      active         3477767073      3750503532               0          1.06e2            1.08
VirtualEthernet0/0/0-tx          active         3477700818      3750437269               0          1.84e3            1.08
dpdk-input                       polling    16272823442465      3750503532               0          2.78e5            0.00
error-drop                       active              66255           66263               0          1.17e2            1.00
ethernet-input                   active         4429434865     10191848689               0          9.61e1            2.30
l2-flood                         active              81553           81594               0          5.29e2            1.00
l2-fwd                           active         4429356482     10191767095               0          6.80e1            2.30
l2-input                         active         4429434865     10191848689               0          1.55e2            2.30
l2-learn                         active         4429434865     10191848689               0          6.60e1            2.30
l2-output                        active         4429434865     10191848689               0          5.48e1            2.30
vhost-user-input                 polling    16252470346346      6441345157               0          2.26e5            0.00
---------------
Thread 2 vpp_wk_1 (lcore 6)
Time 1340274.6, average vectors/node 1.34, last 128 main loops 0.00 per node 0.00
  vector rates in 8.3068e3, out 8.3068e3, drop 3.6559e-5, punt 0.0000e0
             Name                 State         Calls          Vectors        Suspends         Clocks       Vectors/Call  
TenGigabitEthernet43/0/1-outpu   active          633497566      3074652580               0          3.73e1            4.85
TenGigabitEthernet43/0/1-tx      active          633497517      3074652531               0          1.35e2            4.85
VirtualEthernet0/0/1-output      active         7749969518      8058785944               0          1.23e2            1.04
VirtualEthernet0/0/1-tx          active         7749969518      8058785944               0          1.69e3            1.04
dpdk-input                       polling    15572336805744      8058785944               0          1.32e5            0.00
error-drop                       active                 49              49               0          6.62e2            1.00
ethernet-input                   active         8294784335     11133438524               0          1.17e2            1.34
l2-flood                         active                142             142               0          7.26e2            1.00
l2-fwd                           active         8294784194     11133438382               0          9.45e1            1.34
l2-input                         active         8294784335     11133438524               0          2.81e2            1.34
l2-learn                         active         8294784335     11133438524               0          1.65e2            1.34
l2-output                        active         8294784335     11133438524               0          8.25e1            1.34
vhost-user-input                 polling    15552267493917      3074652580               0          4.65e5            0.00

vpp# 

Configure the XML configuration file for vBNG on the Cisco CSR 1000v VM as shown in the following example.

<domain type='kvm' id='21' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
  <name>vbng</name>
  <uuid>7c0c20b3-b9b6-462c-a1e6-01d3efac0abe</uuid>
  <memory unit='KiB'>8388608</memory>
  <currentMemory unit='KiB'>8388608</currentMemory>
  <memoryBacking>
    <hugepages/>
  </memoryBacking>
  <vcpu placement='static'>28</vcpu>
  <os>
    <type arch='x86_64' machine='pc-i440fx-xenial'>hvm</type>
    <boot dev='hd'/>
  </os>
  <features>
    <acpi/>
    <apic/>
  </features>
  <cpu mode='host-model'>
    <model fallback='allow'/>
    <topology sockets='2' cores='14' threads='1'/>
  </cpu>
  <clock offset='utc'>
    <timer name='rtc' tickpolicy='catchup'/>
    <timer name='pit' tickpolicy='delay'/>
    <timer name='hpet' present='no'/>
  </clock>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <pm>
    <suspend-to-mem enabled='no'/>
    <suspend-to-disk enabled='no'/>
  </pm>
  <devices>
    <emulator>/usr/bin/kvm-spice</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2'/>
      <source file='/var/lib/libvirt/images/vbng.qcow2'/>
      <backingStore/>
      <target dev='hda' bus='ide'/>
      <alias name='ide0-0-0'/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>
    <disk type='file' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <backingStore/>
      <target dev='hdb' bus='ide'/>
      <readonly/>
      <alias name='ide0-0-1'/>
      <address type='drive' controller='0' bus='0' target='0' unit='1'/>
    </disk>
    <controller type='usb' index='0' model='ich9-ehci1'>
      <alias name='usb'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x7'/>
    </controller>
    <controller type='usb' index='0' model='ich9-uhci1'>
      <alias name='usb'/>
      <master startport='0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0' multifunction='on'/>
    </controller>
    <controller type='usb' index='0' model='ich9-uhci2'>
      <alias name='usb'/>
      <master startport='2'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x1'/>
    </controller>
    <controller type='usb' index='0' model='ich9-uhci3'>
      <alias name='usb'/>
      <master startport='4'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x2'/>
    </controller>
    <controller type='pci' index='0' model='pci-root'>
      <alias name='pci.0'/>
    </controller>
    <controller type='ide' index='0'>
      <alias name='ide'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
    </controller>
    <controller type='virtio-serial' index='0'>
      <alias name='virtio-serial0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
    </controller>
    <interface type='network'>
      <mac address='52:54:00:80:e7:05'/>
      <source network='default' bridge='virbr0'/>
      <target dev='vnet0'/>
      <model type='rtl8139'/>
      <alias name='net0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </interface>
    <serial type='pty'>
      <source path='/dev/pts/5'/>
      <target port='0'/>
      <alias name='serial0'/>
    </serial>
    <console type='pty' tty='/dev/pts/5'>
      <source path='/dev/pts/5'/>
      <target type='serial' port='0'/>
      <alias name='serial0'/>
    </console>
    <channel type='spicevmc'>
      <target type='virtio' name='com.redhat.spice.0' state='disconnected'/>
      <alias name='channel0'/>
      <address type='virtio-serial' controller='0' bus='0' port='1'/>
    </channel>
    <redirdev bus='usb' type='spicevmc'>
      <alias name='redir0'/>
    </redirdev>
    <redirdev bus='usb' type='spicevmc'>
      <alias name='redir1'/>
    </redirdev>
    <memballoon model='virtio'>
      <alias name='balloon0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
    </memballoon>
  </devices>
  <seclabel type='dynamic' model='apparmor' relabel='yes'>
    <label>libvirt-7c0c20b3-b9b6-462c-a1e6-01d3efac0abe</label>
    <imagelabel>libvirt-7c0c20b3-b9b6-462c-a1e6-01d3efac0abe</imagelabel>
  </seclabel>
  <qemu:commandline>
    <qemu:arg value='-numa'/>
    <qemu:arg value='node,memdev=mem'/>
    <qemu:arg value='-mem-prealloc'/>
    <qemu:arg value='-object'/>
    <qemu:arg value='memory-backend-file,id=mem,size=8G,mem-path=/dev/hugepages,share=on,share=on'/>
    <qemu:arg value='-netdev'/>
    <qemu:arg value='vhost-user,id=hostnet1,chardev=vhost-user-vm1-int,vhostforce'/>
    <qemu:arg value='-device'/>
    <qemu:arg value='virtio-net-pci,netdev=hostnet1,id=net1,mac=52:54:00:00:01:01,mrg_rxbuf=on'/>
    <qemu:arg value='-chardev'/>
    <qemu:arg value='socket,id=vhost-user-vm1-int,server,path=/tmp/vhost-user-vm1-int1'/>
    <qemu:arg value='-netdev'/>
    <qemu:arg value='vhost-user,id=hostnet2,chardev=vhost-user-vm1-int2,vhostforce'/>
    <qemu:arg value='-device'/>
    <qemu:arg value='virtio-net-pci,netdev=hostnet2,id=net2,mac=52:54:00:00:01:02,mrg_rxbuf=on'/>
    <qemu:arg value='-chardev'/>
    <qemu:arg value='socket,id=vhost-user-vm1-int2,server,path=/tmp/vhost-user-vm1-int2'/>
  </qemu:commandline>
</domain>

Enter the following commands on the Cisco CSR 1000v, to configure PPPoE over an L2TPv3 tunnel.

        configure terminal
            interface Tunnel0 
                mac-address 0000.5e00.5213 
                ip address 10.10.151.1 255.255.255.0     
                tunnel mode ethernet l2tpv3 manual 
                l2tp id 222 111
                l2tp cookie local 8 54321
                l2tp cookie remote 8 12345
                tunnel destination 2001:DB8:1111:2222::1
                tunnel source 2001:DB8:2:2::1
                tunnel VLAN 10
                service-policy type control POLICY1
                pppoe enable group 1 

tunnel mode ethernet l2tpv3 specifies L2TPv3 as the tunneling method. The l2tp id command specifies the local and remote session IDs and the l2tp cookie local command configures a cookie field with a size in bytes (for example, 8 bytes) and a low value (for example, 54321).

l2tp cookie remote configures a cookie field with a size in bytes (for example, 8 bytes) and a low value (for example, 12345). The cookie field is part of the Layer 2 Tunnel Protocol Version 3 (L2TPv3) headers in outgoing packets that are sent from the local PE peer router.

The tunnel destination is the destination IPv6 address on the OLT/DSLAM that connects to the CPE. This is the end tunnel destination from the point of view of the vBNG (on the Cisco CSR 1000v).

tunnel source —source IPv6 address of the vBNG (on the Cisco CSR 1000v, on the x86 server).

This is another example showing different cookie options:

 
 
interface Tunnel1
mac-address aaaa.bbbb.1101
no ip address
ip verify unicast source reachable-via rx
pppoe enable group global
tunnel source GigabitEthernet1
tunnel mode ethernet l2tpv3 manual
tunnel destination 1111:1101::ABCD
tunnel path-mtu-discovery
tunnel vlan 401
l2tp static remote session 1
l2tp static remote cookie size 8 value 0x4 0x4
l2tp static local session 1
l2tp static local cookie size 8 value 0x4 0x4
!
 

Refer to the Cisco CSR 1000v router configurations in Configuring PPPoE over an L2TPv3 Tunnel on the Cisco CSR 1000v.

To display information about PPPoE sessions running on the L2TPv3 tunnels, enter the show pppoe summary command.

This displays a summary of the currently active PPP over Ethernet (PPPoE) sessions per interface. For further information, see the Cisco IOS Broadband Access Aggregation and DSL Command Reference. The following example shows summary information about the PPPoE sessions running over tunnel Tunnel1.

Device# show pppoe summary
Load for five secs: 0%/0%; one minute: 0%; five minutes: 0%
No time source, *10:26:27.815 UTC Thu Oct 19 2017
 
    PTA  : Locally terminated sessions
    FWDED: Forwarded sessions
    TRANS: All other sessions (in transient state)
 
                                TOTAL     PTA   FWDED   TRANS
TOTAL                               1       1       0       0
Tunnel1                             1       1       0       0
Device# 

Enter the show pppoe session command to display the currently active PPP over Ethernet (PPPoE) sessions.

Device# show pppoe session                                      
Load for five secs: 15%/0%; one minute: 14%; five minutes: 13%
No time source, *16:19:38.030 UTC Thu Oct 26 2017
 
  8000 sessions in LOCALLY_TERMINATED (PTA) State
  8000 sessions total
 
Uniq ID  PPPoE  RemMAC          Port                    VT  VA         State
           SID  LocMAC                                      VA-st      Type
    596    596  0011.9400.0080  Tu1                      1  Vi2.585    PTA 
                aaaa.bbbb.1101                              UP             
    598    598  0011.9400.0081  Tu1                      1  Vi2.586    PTA 
                aaaa.bbbb.1101                              UP             
    601    601  0011.9400.0082  Tu1                      1  Vi2.592    PTA 
                aaaa.bbbb.1101                              UP             
    605    605  0011.9400.0083  Tu1                      1  Vi2.593    PTA 
                aaaa.bbbb.1101                              UP             
    608    608  0011.9400.0084  Tu1                      1  Vi2.600    PTA 
                aaaa.bbbb.1101                              UP              
    612    612  0011.9400.0085  Tu1                      1  Vi2.602    PTA 
                aaaa.bbbb.1101                              UP             
    616    616  0011.9400.0086  Tu1                      1  Vi2.606    PTA 
                aaaa.bbbb.1101                              UP             
    619    619  0011.9400.0087  Tu1                      1  Vi2.610    PTA 
                aaaa.bbbb.1101                              UP             
      1      1  0011.9400.0008  Tu1                      1  Vi2.3      PTA 
          
Device#

Perform the show platform hardware qfp active feature subscriber segment command to view the segment ids. Example:

Device# show platform hardware qfp active feature subscriber segment
Load for five secs: 12%/0%; one minute: 13%; five minutes: 13%
No time source, *16:22:02.582 UTC Thu Oct 26 2017
 
Current number segments: 16000
 
      Segment       SegType     QFP Hdl       PeerSeg        Status
----------------------------------------------------------------------
0x0000003600003006    PPPOE          49 0x000000360000600b       BOUND
0x000000360000600b    LTERM          49 0x0000003600003006       BOUND
0x0000003800004008    PPPOE          50 0x000000380000700c       BOUND
…
         
Device#

To display the PPPoE encapsulation, enter the show platform software subscriber fp active segment id command as shown in the following example. This example shows the PPPoE encapsulation for one of the segments identified in the previous example, with Segment ID= 0x0000003600003006.

Device# show platform software subscriber fp active segment id 0x0000003600003006          
Load for five secs: 14%/0%; one minute: 13%; five minutes: 13%
No time source, *16:24:11.425 UTC Thu Oct 26 2017
 
     Segment           SegType        EVSI     Changes      AOM Id  AOM State       
-----------------------------------------------------------------------------------
0x0000003600003006       PPPoE          54  0x00000000         651  created         
 
PPPoE Session id 0x3
MAC enctype 0x1a
Switch Mode 0x2
Max MTU 0x5b4
VLAN cos 0x8
Phy Intf (on CPP) 0x10
Conditional Debug OFF
MAC Address Local: aaaabbbb1109
MAC Address Remote: 002194000008
PPPoE encap string [76 bytes]:60000000000073ff1111222200000000000000000000cdef1111110900000000000000000000
abcd000000090000000400000004002194000008aaaabbbb1109810001998864110000030000
 
Flow Information:
Flows activated/attached: 2/2
Input Classes: 2
      Id       Priority   Flow EVSI  Class-Group Id  Filter Type:
                                                     Filter Name
-----------------------------------------------------------------------------
          2           0     4210704   368259939.1    Named ACL:
                                                     acct_in
          4           0     4210705   368259939.2    Named ACL:
                                                     acct_inv6
Output Classes: 2
      Id       Priority   Flow EVSI  Class-Group Id  Filter Type:
                                                     Filter Name
-----------------------------------------------------------------------------
          3           0     4210704   146674515.1    Named ACL:
                                                     acct_out
          5           0     4210705   146674515.2    Named ACL:
                                                     acct_outv6
 
 
Device#

To display MAC string information for a segment, use the show platform hardware qfp command as shown in the following example:

 
Device# show platform hardware qfp active feature subscriber segment id 0x0000003600003006          

Load for five secs: 12%/0%; one minute: 13%; five minutes: 13%
No time source, *16:28:59.639 UTC Thu Oct 26 2017
Segment ID: 0x3600003006
 
  EVSI: 54
  Peer Segment ID: 0x360000600b
  QFP vsi if handle: 49
  QFP interface name: EVSI54
  Segment type: PPPOE
  Is conditional debug: 0
  Is SIP: 1
  Segment status: BOUND
  Macstring length: 76
    00000000  6000  0000  0000  73ff  1111  2222  0000  0000 
    00000010  0000  0000  0000  cdef  1111  1109  0000  0000 
    00000020  0000  0000  0000  abcd  0000  0009  0000  0004 
    00000030  0000  0004  0021  9400  0008  aaaa  bbbb  1109 
    00000040  8100  0199  8864  1100  0003  0000 
  Encap info exmem handle: 0x0
  session id: 3
  vcd: 409
  mtu: 1460
  physical if handle: 16
  hash value: 0x0000bd8c
  Input Classes: 2
    Class Id  Flow EVSI      CG Id               QFP Hdl
  ------------------------------------------------------
           2    4210704  368259939.1                  54
           4    4210705  368259939.2                  55
  Output Classes: 2
    Class Id  Flow EVSI      CG Id               QFP Hdl
  ------------------------------------------------------
           3    4210704  146674515.1                  54
           5    4210705  146674515.2                  55
 
Device#
 

To show the adjacency created after a PPPoE session is enabled for an L2TPv3 tunnel (Tunnel1), enter the show adjacency encapsulation and show adjacency detail commands on the Cisco CSR 1000v. The PPPoE session goes from the vBNG on the Cisco CSR 1000v VM to the Agg/Edge router (for example, a Cisco ASR 9000). The following examples

vBNG# show adjacency encapsulation

RAW      Tunnel1                   point2point(3)
  Encap length 70
  60000000000073FF1111222200000000
  000000000000CDEF1111110100000000
  000000000000ABCD0000000100000004
  00000004000000000000AAAABBBB1101
  810001918864
  Provider: TUNNEL
  Protocol header count in macstring: 1
    HDR 0: ipv6
       dst: static, 1111:1101::ABCD
       src: static, 1111:2222::CDEF
      prot: static, 115
        tc: static, 0
      flow: static, 0
      hops: static, 255
      per packet fields: payload_length

vBNG# show adjacency detail
IPV6     GigabitEthernet1          FE80::AA0C:DFF:FE53:2061(3)
                                   0 packets, 0 bytes
                                   epoch 0
                                   sourced in sev-epoch 45988
                                   Encap length 14
                                   A80C0D53206152540000010186DD
                                   L2 destination address byte offset 0
                                   L2 destination address byte length 6
                                   Link-type after encap: ipv6
                                   IPv6 ND

Show the running configuration for the L2TPv3 tunnel interface.

vBNG# show running-configuration interface Tunnel1

Load for five secs: 1%/0%; one minute: 0%; five minutes: 0%
No time source, *10:58:51.169 UTC Wed Oct 18 2017

Building configuration...

Current configuration : 440 bytes
!
interface Tunnel1
 mac-address aaaa.bbbb.1101
 no ip address
 ip verify unicast source reachable-via rx
 pppoe enable group global
 tunnel source GigabitEthernet1
 tunnel mode ethernet l2tpv3 manual
 tunnel destination 1111:1101::ABCD
 tunnel path-mtu-discovery
 tunnel vlan 401
 l2tp static remote session 1
 l2tp static remote cookie size 8 value 0x4 0x4
 l2tp static local session 1
 l2tp static local cookie size 8 value 0x4 0x4

To show the L2TPv3 tunnel interface, enter the show interface command as shown in the following example.

vBNG# show interface Tunnel1

Load for five secs: 0%/0%; one minute: 0%; five minutes: 0%
No time source, *10:59:18.610 UTC Wed Oct 18 2017

Tunnel1 is up, line protocol is up 
  Hardware is Tunnel
  MTU 1460 bytes, BW 100 Kbit/sec, DLY 50000 usec, 
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation TUNNEL, loopback not set
  Keepalive not set
  Tunnel linestate evaluation up
  Tunnel source 1111:2222::CDEF (GigabitEthernet1), destination 1111:1101::ABCD
   Tunnel Subblocks:
      src-track:
         Tunnel1 source tracking subblock associated with GigabitEthernet1
          Set of tunnels with source GigabitEthernet1, 41 members (includes iterators), on interface <OK>
  Tunnel protocol/transport L2TP/IPV6
    L2TPv3 
    remote session-id:1
    local session-id:1
    local cookie size:8, low value:0x4, high value:0x4
    remote cookie size:8, low value:0x4, high value:0x4
  Tunnel TTL 255
  Path MTU Discovery, ager 10 mins, min MTU 1280
  Tunnel transport MTU 1460 bytes
  Tunnel transmit bandwidth 8000 (kbps)
  Tunnel receive bandwidth 8000 (kbps)
  Last input never, output 1d03h, output hang never
  Last clearing of "show interface" counters 3d03h
  Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/0 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     9583487 packets input, 9983601325 bytes, 0 no buffer
     Received 0 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles 
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     13458 packets output, 1739662 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 unknown protocol drops
     0 output buffer failures, 0 output buffers swapped out
vBNG#

The following command shows the IPsec Cisco Quantum Flow Processor (QFP) information about tunnel1.

vBNG# show platform hardware qfp active feature tunnel interface tunnel1

Load for five secs: 0%/0%; one minute: 0%; five minutes: 0%
No time source, *10:56:51.924 UTC Wed Oct 18 2017
General interface info:
  Interface name: Tunnel1
  Platform interface handle: 11
  QFP interface handle: 8
  QFP complex: 0
  Rx uIDB: 65530  Tx uIDB: 65528
  Hash index : 0x0003f6
  Hash element ppe addr : 0xe89bf440
  ESP Hash element ppe addr : 00000000
  AH Hash element ppe addr : 00000000
  UDP Hash element ppe addr : 00000000
  Output sb ppe addr : 0xe816fc20
  Decap chk sb ppe addr : 00000000
  DMVPN sb ppe addr input: 00000000 output: 00000000
  SGRE input sb ppe addr : 00000000
  L2TPOIPV6 input sb ppe addr : 0xe75c6000
Config:
  mode: L2TPV3oIPV6
  src IP: 1111:2222:0000:0000:0000:0000:0000:cdef  dest IP: 1111:1101:0000:0000:0000:0000:0000:abcd
  ipv4_intf_vrf: 0  tun_vrf: 0 tun_vrf_egress: 0
  key: 0  flags: 0x0081  app_id: TUN_APP_CLI  app_data: 0
  ttl: 255  tos: 0
  tunnel_protection: FALSE
  virtual MAC: aaaa.bbbb.1101
  lport: 0  rport: 0
  tunnel_enable_entropy: FALSE
  remote_session_id: 1 vlan id for l2tpoipv6: 401
  remote_cookie_size: 8  local_cookie_size: 8 local_cookie_secondary_size: 255 
  remote_cookie_low: 4  remote_cookie_high: 4
  local_cookie_low: 4  local_cookie_high: 4
  local_cookie_secondary_low: 0  local_cookie_secondary_high: 0

 

The following show running-configuration command, shows the Cisco CSR 1000v VM configuration on the x86 server.

vBNG# show running-configuration

Building configuration...

Current configuration : 4401 bytes
!
! Last configuration change at 13:38:48 IST Tue Oct 17 2017
!
version 16.6
service timestamps debug datetime msec
service timestamps log datetime msec
platform qfp utilization monitor load 80
no platform punt-keepalive disable-kernel-core
!
hostname vBNG
!
boot-start-marker
boot system harddisk:asr1000rpx86-universalk9.2017-06-16_14.49_vijasin3.SSA.bin
boot-end-marker
!
!
vrf definition Mgmt-intf
 !
 address-family ipv4
 exit-address-family
 !
 address-family ipv6
 exit-address-family
!
logging buffered 10000000
no logging console
!
aaa new-model
!
!
aaa group server radius GROUP1
 server name RAD1
!
aaa group server radius acct
 server name RAD1
!
aaa authentication login CONSOLE none
aaa authentication ppp default local
aaa authorization network default local 
aaa authorization subscriber-service default local 
aaa accounting update periodic 1
aaa accounting network default start-stop group GROUP1
aaa accounting network List1 start-stop group GROUP1
!
aaa session-id common
clock timezone IST 5 30
!
subscriber templating
subscriber accounting accuracy 10000
! 
ipv6 unicast-routing
!
!
multilink bundle-name authenticated
vpdn enable
vpdn authen-before-forward
!
vpdn-group test1
 accept-dialin
  protocol l2tp
  virtual-template 1
 terminate-from hostname CSR_TENGIG
 l2tp tunnel password 0 cisco
!         
!
crypto pki trustpoint TP-self-signed-336246438
 enrollment selfsigned
 subject-name cn=IOS-Self-Signed-Certificate-336246438
 revocation-check none
 rsakeypair TP-self-signed-336246438
!
!
crypto pki certificate chain TP-self-signed-336246438
!
!
license udi pid ASR1006 sn NWG123704SS
license accept end user agreement
license boot level adventerprise
spanning-tree extend system-id
diagnostic bootup level minimal
!
!
username user1@cisco.com password 0 cisco
username lac@cisco.com password 0 cisco
username user1lac@cisco.com password 0 cisco
username user2lac@cisco.com password 0 cisco
username lacupsrl@cisco.com password 0 cisco
username lacdownsrl@cisco.com password 0 cisco
!
redundancy
 mode sso
!
!
interface GigabitEthernet0/0/0
 ip address 9.45.102.50 255.255.0.0
 ip nat outside
 negotiation auto
!
<commands removed for brevity>

interface TenGigabitEthernet0/2/0
 ip address 40.1.1.2 255.255.255.0
 ip nat inside
!
interface TenGigabitEthernet0/3/0
 ip address 50.1.1.1 255.255.255.0
!
interface GigabitEthernet0
 vrf forwarding Mgmt-intf
 no ip address
 negotiation auto
!
interface Virtual-Template1
 ip unnumbered TenGigabitEthernet0/2/0
 peer default ip address pool test1
 peer default ipv6 pool test1_v6
 ipv6 unnumbered TenGigabitEthernet0/2/0
 ppp mtu adaptive
 ppp authentication pap chap
!
interface Virtual-Template2
 ip unnumbered GigabitEthernet0/0/3
 ppp authentication pap
!
ip local pool test1 2.1.1.1 2.1.1.254
ip nat inside source list 1 interface GigabitEthernet0/0/0 overload
ip forward-protocol nd
ip http server
ip http authentication local
ip http secure-server
ip tftp source-interface GigabitEthernet0/0/0
ip tftp blocksize 8192
ip route 0.0.0.0 0.0.0.0 9.45.0.1
ip route 1.1.0.0 255.255.0.0 40.1.1.1
ip route 10.1.1.0 255.255.255.0 40.1.1.1
ip route 20.1.1.0 255.255.255.0 40.1.1.1
ip route 30.1.1.0 255.255.255.0 40.1.1.1
ip route 100.1.0.0 255.255.0.0 60.1.1.1
ip route 200.1.0.0 255.255.0.0 60.1.1.1
ip route 202.153.144.25 255.255.255.255 9.45.0.1
!
ip ssh server algorithm encryption aes128-ctr aes192-ctr aes256-ctr
ip ssh client algorithm encryption aes128-ctr aes192-ctr aes256-ctr
!
access-list 1 permit 30.1.1.0 0.0.0.255
access-list 1 permit any
ipv6 local pool test1_v6 5555::/48 64
!
radius server RAD1
 address ipv4 10.64.67.97 auth-port 1645 acct-port 1646
 key cisco123
!
!
control-plane
!
line con 0
 stopbits 1
line vty 0 4
!
end

Enter the following command to obtain information about a tunnel:

debug tunnel l2tp ipv6

In the following example, the normal case is shown, where the tunnel interface is shown as being up and running.

vBNG# debug tunnel l2tp ipv6
*Oct 19 10:32:38.475: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel30, changed state to up
*Oct 19 10:32:38.478: Tunnel30: Adding 12 bytes for l2tp header
*Oct 19 10:32:38.478: Tunnel30: L2TPv3 header session id: 0x1E, cookie low: 0x4, cookie high: 0x4
*Oct 19 10:32:38.478: Tunnel30: Adding 18 bytes for ethernet header
*Oct 19 10:32:38.478: Tunnel30: Ethernet header, dst mac:0000.0000.0000, src mac:aaaa.bbbb.1130, dot1q, vlan:430, ethertype:34916
*Oct 19 10:32:38.485: %LINK-3-UPDOWN: Interface Tunnel30, changed state to up