Hello, everyone!
Today, I will write about NE cascading. It is networking mode, which saves the upstream fiber resources. Let's get started.
NE cascading is a network mode that allows OLTs to connect directly to other OLTs via the Ethernet port on the control board. This allows savings in the upstream direction, as a connection is made between an OLT and core equipment. Other advantages of this solution are simple topology, easier service configuration, etc.
The control board, ETH optical interface uplink board, and ETH optical interface service board are used for cascading OLTs.
OLT supports two cascading modes:
Local cascading is the cascading of multiple OLT subracks in a cabinet or another variant of cascading multiple local cabinets.
Remote cascading is a way where a remote OLT subrack is cascaded.
Based on the connection method, OLT supports two types of cascade connections:
Star cascading. In this topology, OLTs and upstream devices create a star topology. This allows for easy networking and high reliability. And,
Daisy chain cascading. In this topology, OLTs with upstream device realizes a chain topology. Problem with this solution because if there is a problem with one device, the other cascaded devices stop working.
The next two figures show star cascading (figure 1) and daisy chain cascading (figure 2).
Figure 1. Star cascading
Figure 2. Daisy chain cascading
The basic requirements for cascading two OLTs are that master and slave OLTs have cascade ports of the same type, duplex mode port, and port rate.
The master OLT configuration has 5 steps:
Step 1. Upstream board or port configuration is required, using the following command:
network-role [port-id] uplink.
Step 2. The cascade board or port configuration is required, using the command:
network-role [port-id] cascade.
Step 3. Configure the VLAN. VLAN is a smart type, and the attribute is common. We then add it to the upstream port and cascade port (Steps 4 and 5). The commands are:
#port vlan,
#port vlan or service port.
The slave OLT configuration has 3 steps:
Step 1. Upstream board or port configuration is required, using the following command:
network-role [port-id] uplink.
Step 2. Configure the VLAN. VLAN is a smart type, and the attribute is common. We then add it to the upstream port (Step 3). And that's the end.
This is the end of this topic. I hope you have learned something new!
Thank you!
