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Chapter 3: System planning
Data network planning
IP interface
Select the IP version for the IP interface of the ODU management agent. PTP 650 can operate in
IPv4 mode, IPv6 mode, or in a dual IPv4/IPv6 mode. Choose one IPv4 address and/or one IPv6
address for the IP interface of the ODU management agent. The IP address or addresses must be
unique and valid for the connected network segment and VLAN.
Find out the correct subnet mask (IPv4) or prefix length (IPv6) and gateway IP address for this
network segment and VLAN.
Ensure that the design of the data network permits bidirectional routing of IP datagrams between
network management systems and the ODUs. For example, ensure that the gateway IP address
identifies a router or other gateway that provides access to the rest of the data network.
Quality of service for bridged Ethernet traffic
Decide how quality of service will be configured in PTP 650 to minimize frame loss and latency for
high priority traffic. Wireless links often have lower data capacity than wired links or network
equipment like switches and routers, and quality of service configuration is most critical at network
bottlenecks.
PTP 650 provides eight queues for traffic waiting for transmission over the wireless link. Q0 is the
lowest priority queue and Q7 is the highest priority queue. Traffic is scheduled using strict priority;
in other words, traffic in a given queue is transmitted when all higher-priority queues are empty.
Layer 2 control protocols
Select the transmission queue for each of the recognised layer 2 control protocols (L2CP). These
protocols are essential to correct operation of the Ethernet network, and are normally mapped to a
high priority queue. Ethernet frames that match one of the recognized L2CPs are not subject to the
Ethernet and IP/MPLS classification described below.
Priority schemes
Select the priority scheme based on Ethernet priority or IP/MPLS priority to match QoS policy in
the rest of the data network. Ethernet priority is also known as Layer 2 or link layer priority.
IP/MPLS priority is also known as Layer 3 or network layer priority.
Ethernet priority scheme
Ethernet priority is encoded in a VLAN tag. Use the Ethernet priority scheme if the network carries
traffic in customer or service provider VLANs, and the priority in the VLAN tag has been set to
indicate the priority of each type of traffic. Select a suitable mapping from the Ethernet priority to
the eight PTP 650 queues.
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