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Learn how to install, configure, and operate the Vyatta Network Operating System (Vyatta NOS) and Orchestrator, which help drive our virtual networking and physical platforms portfolio.

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L2TPv3 configuration examples

Configuring an LNS-to-LNS tunnel with BGP routes

This section shows the topology of a sample L2TPv3 LNS-to-LNS IPv4 tunnel with Border Gateway Protocol (BGP) configuration. To configure this sample LNS-to-LNS tunnel, perform the following steps in configuration mode.

  1. Configure the L2TPv3 tunnel settings and the LNS settings on the R1 router.
    1. Configure the L2TPv3 tunnel settings (Configuring the L2TPv3 tunnel interface settings on R1).
    2. Configure the BGP settings (Configuring the BGP settings of the LNS-to-LNS tunnel on R1).
  2. Configure the L2TPv3 tunnel settings and LNS settings on the R2 router.
    1. Configure the L2TPv3 tunnel settings (Configuring the L2TPv3 tunnel interface settings on R2).
    2. Configure the BGP settings (Configuring the BGP settings of the LNS-to-LNS tunnel on R2).
      Figure 1. Sample LNS-to-LNS IPv4 tunnel with BGP routes

      Configuring the L2TPv3 tunnel interface settings on R1 shows how to configure the L2TPv3 tunnel interface on R1.

      Table 1. Configuring the L2TPv3 tunnel interface settings on R1

      Step

      Command

      Specify IP as the encapsulation method to use for the lttp2222 L2TPv3 tunnel interface. 

      vyatta@vyatta# set interfaces l2tpeth lttp2222 l2tp-session encapsulation 'ip'

      Specify the local IP address of the lttp2222 L2TPv3 tunnel interface. 

      vyatta@vyatta# set interfaces l2tpeth lttp2222 l2tp-session local-ip '100.3.1.1'

      Specify the local session identifier of the lttp2222 L2TPv3 tunnel interface. 

      vyatta@vyatta# set interfaces l2tpeth lttp2222 l2tp-session local-session-id '1000000'

      Specify the remote IP address of the lttp2222 L2TPv3 tunnel interface. 

      vyatta@vyatta# set interfaces l2tpeth lttp2222 l2tp-session remote-ip '200.3.1.1'

      Specify the remote session identifier of the lttp2222 L2TPv3 tunnel interface. 

      vyatta@vyatta# set interfaces l2tpeth lttp2222 l2tp-session remote-session-id '1000000'

      Specify the IP address of the tunnel interface to which the router is connected. 

      vyatta@vyatta# set interfaces l2tpeth lttp2222 address '2.2.2.1/29'

      Commit the configuration. 

      vyatta@vyatta# commit

      Save the configuration. 

      vyatta@vyatta# save

      Configuring the BGP settings of the LNS-to-LNS tunnel on R1 shows how to configure the BGP settings for the tunnel on R1. For more information about configuring BGP settings, refer to BGP Reference Guide.

      Table 2. Configuring the BGP settings of the LNS-to-LNS tunnel on R1

      Step

      Command

      Specify the 44.44.44.0/24 network as the network to be advertised by the BGP routing process. 

      vyatta@vyatta# set protocols bgp 100 address-family ipv4-unicast network '44.44.44.0/24'

      Direct the router to store received routing updates. 

      vyatta@vyatta# set protocols bgp 100 neighbor 2.2.2.2 address-family ipv4-unicast soft-reconfiguration 'inbound'

      Specify 200 as the autonomous system (AS) number of the neighbor. 

      vyatta@vyatta# set protocols bgp 100 neighbor 2.2.2.2 remote-as '200'

      Set the fixed BGP router ID for the router to 2.2.2.1. This setting overrides the automatic ID selection process. 

      vyatta@vyatta# set protocols bgp 100 parameters router-id '2.2.2.1'

      Commit the configuration. 

      vyatta@vyatta# commit

      Save the configuration. 

      vyatta@vyatta# save

      Show the l2tpeth configuration. 

      vyatta@vyatta# run show l2tpeth


L2tpeth interface: lttp2222
   Port: 0, ifIndex: 19
   Mac: 96:89:f9:e7:6e:d1
   Addresses:
        inet 2.2.2.1/29, broadcast 2.2.2.7
        inet6 fe80::9489:f9ff:fee7:6ed1/64, scope Link
   L2TPv3: Encap IP
      Local Address: 100.3.1.1       Peer Address: 200.3.1.1
      Local Session: 2000000         Peer Session: 2000000
      Local Cookie: 00               Peer Cookie: 00
   Statistics:
      Input   bytes     :               191229
      Output  bytes     :               144752
      Input   packets   :                 2314
      Output  packets   :                 1143
      Input  multicast  :                  107

      Show the configuration information for lttp2222. 

      vyatta@vyatta# run show interfaces lttp2222
lttp2222: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1488 qdisc pfifo_fast state UNKNOWN group default qlen 1000
    link/ether 96:89:f9:e7:6e:d1 brd ff:ff:ff:ff:ff:ff
    inet 2.2.2.1/29 brd 2.2.2.7 scope global lttp2222
       valid_lft forever preferred_lft forever
    inet6 fe80::9489:f9ff:fee7:6ed1/64 scope link
       valid_lft forever preferred_lft forever

    RX:  bytes    packets     errors    dropped    overrun      mcast
         86696       1082          0          0          0          0
    TX:  bytes    packets     errors    dropped    carrier collisions
         85646       1118          0          0          0          0

      Show a summary of the BGP settings. 

      vyatta@vyatta# run show ip bgp summary
BGP router identifier 2.2.2.1, local AS number 100
BGP table version is 192
2 BGP AS-PATH entries
0 BGP community entries

IPv4 Unicast address family:
Neighbor        V           AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  Statd
2.2.2.2         4          200     383     383      192    0    0 03:10:16      1
Total number of neighbors 1

      Show the BGP settings. 

      vyatta@vyatta# run show ip bgp
BGP table version is 192, local router ID is 2.2.2.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, l - labeled
              S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete

    Network          Next Hop            Metric    LocPrf       Weight Path
*> 44.44.44.0/24    0.0.0.0                       100          32768   i
*> 55.55.55.0/24    2.2.2.2              0                     0       200 i

Total number of prefixes 2

      Show the route information for the 55.55.55.2 system. 

      vyatta@vyatta# run show ip route 55.55.55.2
Routing entry for 55.55.55.0/24
  Known via "bgp", distance 20, metric 0, best
  Last update 00:04:06 ago
  * 2.2.2.2, via lttp2222

      Configuring the L2TPv3 tunnel interface settings on R2 shows how to configure the L2TPv3 tunnel interface on R2.

      Table 3. Configuring the L2TPv3 tunnel interface settings on R2
      Step Command

      Specify IP as the encapsulation method to use for the lttp2222 L2TPv3 tunnel interface. 

      vyatta@vyatta# set interfaces l2tpeth lttp2222 l2tp-session encapsulation 'ip'

      Specify the local IP address of the lttp2222 L2TPv3 tunnel interface. 

      vyatta@vyatta# set interfaces l2tpeth lttp2222 l2tp-session local-ip '200.3.1.1'

      Specify the local session identifier of the lttp2222 L2TPv3 tunnel interface. 

      vyatta@vyatta# set interfaces l2tpeth lttp2222 l2tp-session local-session-id '2000000'

      Specify the remote IP address of the lttp2222 L2TPv3 tunnel interface. 

      vyatta@vyatta# set interfaces l2tpeth lttp2222 l2tp-session remote-ip '100.3.1.1'

      Specify the remote session identifier of the lttp2222 L2TPv3 tunnel interface. 

      vyatta@vyatta# set interfaces l2tpeth lttp2222 l2tp-session remote-session-id '2000000'

      Specify the IP address of the tunnel interface to which the router is connected. 

      vyatta@vyatta# set interfaces l2tpeth lttp2222 address '2.2.2.2/29'

      Commit the configuration. 

      vyatta@vyatta# commit

      Save the configuration. 

      vyatta@vyatta# save

      Configuring the BGP settings of the LNS-to-LNS tunnel on R2 shows how to configure the BGP settings for the tunnel on R2. For more information about configuring BGP settings, refer to BGP Reference Guide.

      Table 4. Configuring the BGP settings of the LNS-to-LNS tunnel on R2
      Step Command

      Specify the 55.55.55.0/24 network as the network to be advertised by the BGP routing process. 

      vyatta@vyatta# set protocols bgp 100 address-family ipv4-unicast network '55.55.55.0/24'

      Direct the router to store received routing updates. 

      vyatta@vyatta# set protocols bgp 100 neighbor 2.2.2.1 address-family ipv4-unicast soft-reconfiguration 'inbound'

      Specify 100 as the AS number of the neighbor. 

      vyatta@vyatta# set protocols bgp 100 neighbor 2.2.2.1 remote-as '200'

      Set the fixed BGP router ID for the router to 2.2.2.2. This setting overrides the automatic ID selection process. 

      vyatta@vyatta# set protocols bgp 100 parameters router-id '2.2.2.2'

      Commit the configuration. 

      vyatta@vyatta# commit

      Save the configuration. 

      vyatta@vyatta# save

Last updated: May 7, 2021