A Terragraph mesh topology is based on a layer 3 IPv6 network, cnWave radios support IPv4 using layer 2 tunnel.
When Layer2 bridge is enabled on nodes, each node forms a Layer 2 tunnel with POP and transports user traffic. Downstream CPE devices get the IPv4 address from the DHCP server running on the service provider’s network.
PTP V5000-V5000 test setup:
PC connected to POE interface of V5000 (to be acting as POP) via a switch.
The DHCP server should be running on the network, In this case, it’s being run on a switch and below are the details
- Pool Name: Vlan90
- IP address: 188.8.131.52
- Network Address: 184.108.40.206
- Network Mask: 255.255.255.0
- Lease Time: Infinite
Step-by-step configuration to enable Layer2 bridge :
Open the V5000 POP device UI using https://169.254.1.1
Go to “E2E Controller” and “Enable E2E”
Once on-board E2E is enabled, the dashboard appears as below
Now navigate to “Configuration >> Network >> Basic” choose Centralized Prefix Allocation and add the Seed Prefix , this is for the controller to allocate prefixes in CIDR notation to all the nodes (DNs and CNs) in the network for internal communication, since our interest is for ipv4 traffic, generate the prefix using the Generate option
Seed prefix and Prefix length get updated as below
Select the country of operation from the country drop down list.
Move to “Topology >> Sites” and add POP site.
Now add the POP Node details in “Topology >> Nodes >> Add New”, use below option to pre-fill the MAC Address and Platform data.
Fill the other parameters of POP Node, use Generate option to fill the PoP Interface IP Address
Once adding node is successful, the node status shown in Green on Dashboard.
By default, POP node sectors operate on channel 2 , can change the same in “Configuration >> Nodes >> POP >> Radio”.
Enable “Layer 2 bridge” in “Configuration >> Network >> Basic”
This enables the Layer2 bridge configuration across all the nodes connected to a POP.
Now add the DN SITE and DN node details in topology (access the DN using https://169.254.1.1 to get the MAC address).
Align the radio sectors of POP & DN in such a way to have a proper Line-Of-Sight to bring up a wireless link between them, In the below example, POP sector2 is facing the DN sector1. So, adding the link as follows:
On successful addition of a link, the link and device status shall be as shown below (show in Green).
After the wireless link formation, DN forms a tunnel with POP.
Once the tunnel is established, end PCs get the IPv4 address from DHCP server (In this example, PC behind POP gets 220.127.116.11, PC behind DN gets 18.104.22.168)
Now, we can run the iperf3 traffic between the PCs connected to POP and DN using the IPv4 address.
Make sure CPE Interface Functionality (CPE_INTERFACE) is disabled on devices as this CPE interface will not be part of Layer 2 bridge.