Fujitsu 1FINITY L100 User Manual page 38

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System Description and Engineering
ROADM Features
Link Layer Discovery Protocol
Link Layer Discovery Protocol (LLDP) is an industry standard protocol that allows network devices to advertise
their identities to their neighbor devices. A network controller can query the information gathered through LLDP
to create the network topology. The ability to query each device allows standard network management to build
the network and enables multivendor interoperability.
The L100 Blades use LLDP on their OSC ports to discover their neighbors and their IDs. LLDP discovers
information for each OSC, for example, remote node system name, remote node management IP address,
remote OSC port ID, and remote chassis ID.
When an OSC port and its corresponding Ethernet facility are provisioned, LLDP is automatically provisioned on
the OSC port. No manual provisioning is required for LLDP. After LLDP is provisioned, a periodic message is sent
to neighboring devices.
If any information changes on the local device, for example, the system IP address, LLDP notifies the neighboring
devices. When the neighboring devices receive the change information, they notify the network controller.
Internal Rapid Spanning Tree Protocol
Rapid Spanning Tree Protocol (RSTP) has been added to allow the addition of alternate paths for DCN signaling
without the issue of looping. RSTP provides a mechanism to rapidly respond to any changes in the network, for
example, failed spans, addition of components, and removal of components. RSTP typically responds to any of
these events in less than 1 second.
For earlier releases, no alternate path was provided for DCN signals between the blades in the L100 Lambda
Series VNE. All blades were simply daisy-chained using the LCN3 and LCN4 ports on each blade.
Flexible Grid
Flexible grid capability allows flexible spectrum allocation and improves spectrum usage for the CD ROADM
network. Flexible grid supports moving from a fixed, 50 GHz channel spaced system to a flexible channel spaced
system. This finer-grained frequency grid supports mixed channel sizes in increments of 12.5 GHz spectral slices
with a minimum slot width of 37.5 GHz and maximum slot width of 500 GHz. Any combinations of frequency
slots are allowed, as long as no two frequency slots overlap.
Flexible grid application using only a 37.5 GHz channel plan supports a maximum 128 channels with central
frequencies from 196.10625 to 191.34375 THz. The default slot width is 50 GHz. An Individual Licensed Feature
(ILF) is needed to enable the flexible grid capability.
Note: The maximum slot-width of 500 GHz is supported, but the maximum tested slot-width is 100 GHz.
· Fujitsu and Fujitsu Customer Use Only
Release 19.1.1 Issue 1.1, May 2021