User's Guide Part 1

Chapter 3: System planning Data network planning
VLAN membership
Decide if the IP interface of the ODU management agent will be connected in a VLAN. If so,
decide if this is a standard (IEEE 802.1Q) VLAN or provider bridged (IEEE 802.1ad) VLAN, and
select the VLAN ID for this VLAN.
Use of a separate management VLAN is strongly recommended. Use of the management VLAN
helps to ensure that the ODU management agent cannot be accessed by customers.
If the system is to operate as an IEEE 1588-2008 Transparent Clock, decide if residence time
corrections should be made to:
• All 1588 event frames, regardless of VLAN membership, or
• Only 1588 event frames in a specific customer bridged VLAN, or
• Only 1588 event frames in a specific provider bridged VLAN
Priority for management traffic
Choose the Ethernet and IP (DSCP) priority for management traffic generated within the ODU
management agent. The priority should be selected so as to be consistent with existing policy
on priority of management traffic in the network. Use of a high priority is strongly
recommended to ensure that management traffic is not discarded if the link is overloaded.
Ensure that the priority assigned to management traffic is consistent with the quality of service
scheme configured for bridged Ethernet traffic. If QoS for bridged traffic is based on the
IP/MPLS scheme, set the DSCP management priority to map to a high priority queue. If QoS for
bridged traffic is based on the Ethernet scheme, set the VLAN management priority to map to a
high priority queue.
IP interface
Select the IP version for the IP interface of the ODU management agent. PTP 700 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 700 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.
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