How to do it...

Perform the following steps:

1. Start your OpenDaylight distribution using the karaf script. Using this client will give you access to the Karaf CLI:

$ ./bin/karaf 

1. Install the user facing feature responsible for pulling in all dependencies needed to use the YANG UI:

opendaylight-user@root>feature:install odl-vpnservice-intent 

It might take a minute or so to complete the installation.

1. Create the topology in the Mininet-VM:

• Log in to Mininet-VM using these credentials:
  • Username: mininet
  • Password: mininet
• Create the custom topology.

The topology's script resides at the following location:

$ wget -O shortest_path.py https://gist.githubusercontent.com/adetalhouet/shortest_path.py
$  sudo mn --controller=remote,ip=${CONTROLLER_IP} --custom ~/shortest_path.py --topo shortest_path --switch ovsk,protocols=OpenFlow13

Here, ${CONTROLLER_IP} is the IP address of the host running OpenDaylight.

The topology looks like the following diagram, where openflow:1 and openflow:3 are the PE switches and openflow: 42/43/44 are the P switches. There are two disjoint routes between the PE switches:

1. Create a VPN with the desired constraints (slow-reroute or fast-reroute). We will use slow-reroute in this example:

• Type: POST
• Headers:

Authorization: Basic YWRtaW46YWRtaW4=

• URL: http://localhost:8181/restconf/operations/vpnintent:vpns/
• Payload:

{
  "vpn-intents": [
  {
  "vpn-name": "VPN #1"
  "path-protection": "true",
  "failover-type": "slow-reroute"
  }
]
} 

1. Add the first member to our VPN:

• Type: POST
• Headers:

Authorization: Basic YWRtaW46YWRtaW4=

• URL: http://localhost:8181/restconf/operations/vpnintent:add-vpn-endpoint
• Payload:

{ 
  "input": { 
  "vpn-name": "VPN #1", 
  "site-name": "site1", 
  "ip-prefix": "10.0.0.1/32", 
  "switch-port-id": "openflow:1:1" 
  }
} 

1. Add the second member to our VPN:

• Type: POST
• Headers:

Authorization: Basic YWRtaW46YWRtaW4=

• URL: http://localhost:8181/restconf/operations/vpnintent:add-vpn-endpoint
• Payload:

{ 
  "input": { 
  "vpn-name": "VPN #1", 
  "site-name": "site2", 
  "ip-prefix": "10.0.0.3/32", 
  "switch-port-id": "openflow:3:1" 
  }
} 

1. Look at the current configuration in the OpenDaylight datastore:

• Type: GET
• Headers:

Authorization: Basic YWRtaW46YWRtaW4=

• URL: http://localhost:8181/restconf/config/vpnintent:vpns/

Result:

<vpns xmlns="urn:opendaylight:params:xml:ns:yang:vpnintent"> 
    <vpn-intents> 
        <vpn-name>VPN #1</vpn-name> 
        <failover-type>fast-reroute</failover-type> 
        <path-protection>true</path-protection> 
        <endpoint> 
            <site-name>site1</site-name> 
            <ip-prefix>10.0.0.1/32</ip-prefix> 
            <switch-port-id>openflow:1:1</switch-port-id> 
        </endpoint> 
        <endpoint> 
            <site-name>site3</site-name> 
            <ip-prefix>10.0.0.3/32</ip-prefix> 
            <switch-port-id>openflow:3:1</switch-port-id> 
        </endpoint> 
    </vpn-intents> 
</vpns> 

1. Look at the flows installed in the OvS instance:

mininet@mininet-vm:~$ sudo ovs-ofctl -O OpenFlow13 dump-flows s1 
OFPST_FLOW reply (OF1.3) (xid=0x2):cookie=0x2, duration=96.839s, table=0, n_packets=0, n_bytes=0, priority=10000,arp actions=CONTROLLER:65535,NORMAL cookie=0x2, duration=96.827s, table=0, n_packets=20, n_bytes=1700, priority=9500,dl_type=0x88cc actions=CONTROLLER:65535 cookie=0x0, duration=7.739s, table=0, n_packets=0, n_bytes=0, priority=9000,ip,nw_src=10.0.0.1,nw_dst=10.0.0.3 actions=push_mpls:0x8847,set_field:494630->mpls_label,output:2 cookie=0x0, duration=7.724s, table=0, n_packets=0, n_bytes=0, priority=9000,mpls,mpls_label=337082,mpls_bos=1 actions=pop_mpls:0x0800,output:1 

mininet@mininet-vm:~$ sudo ovs-ofctl -O OpenFlow13 dump-flows s2a
OFPST_FLOW reply (OF1.3) (xid=0x2):cookie=0x3, duration=95.968s, table=0, n_packets=0, n_bytes=0, priority=10000,arp actions=CONTROLLER:65535,NORMAL cookie=0x3, duration=89.545s, table=0, n_packets=37, n_bytes=3145, priority=9500,dl_type=0x88cc actions=CONTROLLER:65535 cookie=0x0, duration=7.747s, table=0, n_packets=0, n_bytes=0, priority=9000,mpls,mpls_label=494630,mpls_bos=1 actions=output:3 cookie=0x0, duration=7.736s, table=0, n_packets=0, n_bytes=0, priority=9000,mpls,mpls_label=337082,mpls_bos=1 actions=output:2

mininet@mininet-vm:~$ sudo ovs-ofctl -O OpenFlow13 dump-flows s3
OFPST_FLOW reply (OF1.3) (xid=0x2): cookie=0x1, duration=97.781s, table=0, n_packets=0, n_bytes=0, priority=10000,arp actions=CONTROLLER:65535,NORMAL cookie=0x1, duration=97.778s, table=0, n_packets=20, n_bytes=1700, priority=9500,dl_type=0x88cc actions=CONTROLLER:65535 cookie=0x0, duration=7.747s, table=0, n_packets=0, n_bytes=0, priority=9000,mpls,mpls_label=494630,mpls_bos=1 actions=pop_mpls:0x0800,output:1 cookie=0x0, duration=7.746s, table=0, n_packets=0, n_bytes=0, priority=9000,ip,nw_src=10.0.0.3,nw_dst=10.0.0.1 actions=push_mpls:0x8847,set_field:337082->mpls_label,output:2

1. Let's test path failover by removing switch s2a:

mininet@mininet-vm:~$  sudo ovs-vsctl del-br s2a 

mininet@mininet-vm:~$ sudo ovs-ofctl -O OpenFlow13 dump-flows s1 
OFPST_FLOW reply (OF1.3) (xid=0x2):cookie=0x2, duration=96.839s, table=0, n_packets=0, n_bytes=0, priority=10000,arp actions=CONTROLLER:65535,NORMAL cookie=0x2, duration=96.827s, table=0, n_packets=20, n_bytes=1700, priority=9500,dl_type=0x88cc actions=CONTROLLER:65535 cookie=0x0, duration=7.739s, table=0, n_packets=0, n_bytes=0, priority=9000,ip,nw_src=10.0.0.1,nw_dst=10.0.0.3 actions=push_mpls:0x8847,set_field:494630->mpls_label,output:2 cookie=0x0, duration=7.724s, table=0, n_packets=0, n_bytes=0, priority=9000,mpls,mpls_label=337082,mpls_bos=1 actions=pop_mpls:0x0800,output:1 

mininet@mininet-vm:~$ sudo ovs-ofctl -O OpenFlow13 dump-flows s2a 
ovs-ofctl: s2a is not a bridge or a socket 

mininet@mininet-vm:~$ sudo ovs-ofctl -O OpenFlow13 dump-flows s2b 
OFPST_FLOW reply (OF1.3) (xid=0x2):cookie=0x3, duration=95.968s, table=0, n_packets=0, n_bytes=0, priority=10000,arp actions=CONTROLLER:65535,NORMAL cookie=0x3, duration=89.545s, table=0, n_packets=37, n_bytes=3145, priority=9500,dl_type=0x88cc actions=CONTROLLER:65535 cookie=0x0, duration=7.747s, table=0, n_packets=0, n_bytes=0, priority=9000,mpls,mpls_label=494630,mpls_bos=1 actions=output:3 cookie=0x0, duration=7.736s, table=0, n_packets=0, n_bytes=0, priority=9000,mpls,mpls_label=337082,mpls_bos=1 actions=output:2 

mininet@mininet-vm:~$ sudo ovs-ofctl -O OpenFlow13 dump-flows s2c 
OFPST_FLOW reply (OF1.3) (xid=0x2):cookie=0x3, duration=95.968s, table=0, n_packets=0, n_bytes=0, priority=10000,arp actions=CONTROLLER:65535,NORMAL cookie=0x3, duration=89.545s, table=0, n_packets=37, n_bytes=3145, priority=9500,dl_type=0x88cc actions=CONTROLLER:65535 cookie=0x0, duration=7.747s, table=0, n_packets=0, n_bytes=0, priority=9000,mpls,mpls_label=494630,mpls_bos=1 actions=output:3 cookie=0x0, duration=7.736s, table=0, n_packets=0, n_bytes=0, priority=9000,mpls,mpls_label=337082,mpls_bos=1 actions=output:2 

mininet@mininet-vm:~$ sudo ovs-ofctl -O OpenFlow13 dump-flows s3 
OFPST_FLOW reply (OF1.3) (xid=0x2): cookie=0x1, duration=97.781s, table=0, n_packets=0, n_bytes=0, priority=10000,arp actions=CONTROLLER:65535,NORMAL cookie=0x1, duration=97.778s, table=0, n_packets=20, n_bytes=1700, priority=9500,dl_type=0x88cc actions=CONTROLLER:65535 cookie=0x0, duration=7.747s, table=0, n_packets=0, n_bytes=0, priority=9000,mpls,mpls_label=494630,mpls_bos=1 actions=pop_mpls:0x0800,output:1 cookie=0x0, duration=7.746s, table=0, n_packets=0, n_bytes=0, priority=9000,ip,nw_src=10.0.0.3,nw_dst=10.0.0.1 actions=push_mpls:0x8847,set_field:337082->mpls_label,output:2