Manual:MPLS L2VPN vs Juniper

Summary

This article describes the basic setup of Point-to-Point L2VPN with Juniper J-series routers.

Configuration

Consider network setup as ilustrated below:

We will be setting up the layer 2 connection between the CE and PE routers as well as the MPLS and L2VPN between PE routers. The layer 2 link between the CE and PE routers will be an Ethernet VLAN circuit.

LDP based VPN

Set up VLANs

CE1 and CE2 routers:

/interface vlan
  add vlan-id=600 name=vlan1 disabled=no interface=ether1

PE1 (RouterOS):

No configuration currently is needed, later we will bridge VPLS tunnel.

PE2 (JunOS):

interfaces {
    fe-0/0/1 {
        vlan-tagging;
        encapsulation vlan-ccc;
        unit 1 {
            encapsulation vlan-ccc;
            vlan-id 600;
        }
    }
}

Set up IP connection, OSPF and LDP

CE1:

/ip address add address=192.168.88.1/24 interface=vlan1

CE2:

/ip address add address=192.168.88.2/24 interface=vlan1

PE1 (RouterOS):

/interface bridge 
  add name=loopback

/ip address
  add address=192.168.168.2/24 interface=ether3
  add address=10.255.11.31/32 interface=loopback

/routing ospf network
  add area=backbone disabled=no network=192.168.168.0/24
  add area=backbone disabled=no network=10.255.11.31/32

/mpls ldp
  set enabled=yes lsr-id=10.255.11.31 transport-address=10.255.11.31

/mpls ldp interface
  add interface=ether3

P (RouterOS):

/interface bridge 
  add name=loopback

/ip address
  add address=10.0.11.23/24 interface=ether1
  add address=192.168.168.1/24 interface=ether2
  add address=10.255.11.23/32 interface=loopback

/routing ospf network
  add area=backbone disabled=no network=10.0.11.0/24
  add area=backbone disabled=no network=192.168.168.0/24
  add area=backbone disabled=no network=10.255.11.23/32

/mpls ldp
  set enabled=yes lsr-id=10.255.11.23 transport-address=10.255.11.23

/mpls ldp interface
  add interface=ether1
  add interface=ether2

PE2 (JunOS):

interfaces {
    fe-0/0/0 {
        unit 0 {
            family inet {
                address 10.0.11.201/24;
            }
            family mpls;
        }
    }
    lo0 {
        unit 0 {
            family inet {
                address 10.255.11.201/32;
            }
        }
    }
}

protocols {
    mpls {
        interface fe-0/0/0.0;
        interface lo0.0;

    }

    ospf {
        export [ export-connected originate ];
        area 0.0.0.0 {
            interface fe-0/0/0.0;
            interface lo0.0 {
                passive;
            }
        }
    }
    ldp {
        egress-policy connected-only;
        transport-address 10.255.11.201;
        interface all;
    }
}

Finally we need to define policy options to advertise label binding for Loopback prefix:

policy-options {
    prefix-list loopback-prefix {
        10.255.11.201/32;
    }
    policy-statement connected-only {
        from {
            prefix-list loopback-prefix;
        }
        then accept;
    }
}

Set up L2VPN

PE1 (RouterOS):

/interface vpls
  add cisco-style=yes cisco-style-id=5 name=junos-l2circuit pw-type=tagged-ethernet \
    remote-peer=10.255.11.201

/interface bridge add name=vpn
/interface bridge port
  add interface=ether5 bridge=vpn
  add interface=junos-l2circuit bridge=vpn

We need to set pw-type=tagged-ethernet since on juniper encapsulation was set to vlan-ccc. Otherwise Juniper will throw an error /EM -- encapsulation mismatch /

PE2 (JunOS):

protocol {
    l2circuit {
        neighbor 10.255.11.31 {
            interface fe-0/0/1.1 {
                virtual-circuit-id 5;
            }
        }
    }
}

Verify Operation

Verify if LDP neighbors are found and forwarding table is created:

PE1:

[admin@10.0.11.31] /mpls ldp neighbor> print 
Flags: X - disabled, D - dynamic, O - operational, T - sending-targeted-hello, 
V - vpls 
 #      TRANSPORT       LOCAL-TRANSPORT PEER                       SEN
 0 DO   10.255.11.23    10.255.11.31    10.255.11.23:0             no 
 1 DOTV 10.255.11.201   10.255.11.31    10.255.11.201:0            yes

[admin@10.0.11.31] /mpls forwarding-table> print 
Flags: L - ldp, V - vpls, T - traffic-eng 
 #   IN-LABEL      OUT-LABELS  DESTINATION                    I NEXTHOP        
 0   expl-null    
 1 L 17            3396        10.255.11.201/32               e 192.168.168.1  
 2 L 19                        10.255.11.23/32                e 192.168.168.1  
 3 L 23            3390        10.5.101.0/24                  e 192.168.168.1  
 4 V 29                        junos-l2circuit        

PE2:

juniper@J4300> show ldp neighbor   
Address            Interface          Label space ID         Hold time
10.255.11.31       lo0.0              10.255.11.31:0           42
10.0.11.23         fe-0/0/0.0         10.255.11.23:0           13

Verify traffic forwarding over LSP:

PE1:

[admin@10.0.11.31] /interface vpls> /tool traceroute 10.255.11.201
 # ADDRESS                                 RT1   RT2   RT3   STATUS            
 1 192.168.168.1                           1ms   1ms   1ms   <MPLS:L=3396,E=0> 
 2 10.255.11.201                           2ms   3ms   3ms                     

Verify if L2VPN tunnel is up and running:

PE1

[admin@10.0.11.31] /interface vpls> monitor junos-l2circuit once 
       remote-label: 577168
        local-label: 29
      remote-status: 
          transport: 10.255.11.201/32
  transport-nexthop: 192.168.168.1
     imposed-labels: 3396,577168

PE2

juniper@J4300> show l2circuit connections 
Layer-2 Circuit Connections:

Legend for connection status (St)   
EI -- encapsulation invalid      NP -- interface h/w not present   
MM -- mtu mismatch               Dn -- down                       
EM -- encapsulation mismatch     VC-Dn -- Virtual circuit Down    
CM -- control-word mismatch      Up -- operational                
VM -- vlan id mismatch           CF -- Call admission control failure
OL -- no outgoing label          IB -- TDM incompatible bitrate 
NC -- intf encaps not CCC/TCC    TM -- TDM misconfiguration 
BK -- Backup Connection          ST -- Standby Connection
CB -- rcvd cell-bundle size bad  XX -- unknown

Legend for interface status  
Up -- operational            
Dn -- down                   
Neighbor: 10.255.11.31 
    Interface                 Type  St     Time last up          # Up trans
    fe-0/0/1.1(vc 5)          rmt   Up     Apr 19 12:28:30 2012           2
      Remote PE: 10.255.11.31, Negotiated control-word: No
      Incoming label: 577168, Outgoing label: 29
      Local interface: fe-0/0/1.1, Status: Up, Encapsulation: VLAN

juniper@J4300> 

BGP Based VPN

Lets consider that we have VLANs, IP connectivity, OSPF and LDP set up from previous LDP based lab.

First thing to do is to set up BGP peers and then we can add L2VPN configuration.

Set up BGP

PE1 (RouterOS):

/routing bgp instance
  set default as=64201 router-id=10.255.11.31
/routing bgp peer
  add address-families=l2vpn name=juniper remote-address=10.255.11.201 \
    remote-as=64201 ttl=default

PE2 (JunOS):

routing-options {
    router-id 10.255.11.201;
    autonomous-system 64201;
}

protocol {
    bgp {
        log-updown;
        group int {
            type internal;
            local-address 10.255.11.201;
            import match-all;
            family l2vpn {
                signaling;
            }
            export match-all;
            neighbor 10.255.11.31;
        }
    }
}

policy-options {
    policy-statement match-all {
        term acceptable {
            then accept;
        }
    }
}

Set up L2VPN

PE1 (RouterOS):

/interface bridge
  add ame=vpn
/interface bridge port
  add interface=ether5 bridge=vpn

/interface vpls bgp-vpls
  add bridge=vpn bridge-cost=0 export-route-targets=1:1 \
    import-route-targets=1:1 name=juniper-l2vpn pw-type=tagged-ethernet \
    route-distinguisher=1:1 site-id=20

PE2 (JunOS):

At first we define what is allowed to import and export by routing instance:

policy-options {
    policy-statement vpn-SPA-export {
        term a {
            then {
                community add SPA-com;
                accept;
            }
        }
        term b {
            then reject;
        }
    }
    policy-statement vpn-SPA-import {
        term a {
            from {
                protocol bgp;
                community SPA-com;
            }
            then accept;
        }           
        term b {
            then reject;
        }
    }
    community SPA-com members target:1:1;
}

Now we can add L2VPN routing instance:

routing-instances {
    vpls1 {
        instance-type l2vpn;
        interface fe-0/0/1.1;
        route-distinguisher 1:1;
        vrf-import [ match-all vpn-SPA-import ];
        vrf-export vpn-SPA-export;
        protocols {
            l2vpn {
                traceoptions {
                    file VPLS-TEST size 100000 files 7;
                    flag all;
                }
                encapsulation-type ethernet-vlan;
                control-word;
                site c2 {
                    site-identifier 21;
                    interface fe-0/0/1.1 {
                        remote-site-id 20;
                    }
                }
                ignore-encapsulation-mismatch;
            }
        }
    }
}

Note: By setting encapsulation-type (pw-type on RouterOS). Does not change actual encapsulation. It is also possible that configured encapsulation types do not match on both ends. In this case you can use ignore-encapsulation-mismatch on Juniper routers.

In this configuration we also have enabled Cotrol Word usage, to fragment larger packets.

Verify Operation

PE1 (RouterOS):

PE2 (JunOS):

See Also

• LDP Based VPLS
• BGP Based VPLS
• Cisco style VPLS