Specifications

Appendix B SNMP Management Installation and Operation Manual
B-6 Handling the Management Traffic FCD-E1LC Ver. 1.0
Inband Management Traffic Routing
The FCD-E1LC management traffic router uses the RAD proprietary routing
protocol whenever it operates in a network environment consisting of RAD
products.
In addition, you can configure the management traffic router to use standard
protocols (such as frame relay), when connecting directly to a router.
• The RAD proprietary routing protocol is used with timeslot 0 and the dedicated
timeslot option.
When the IP router function is configured to use the RAD proprietary
protocol, it collects information on the other SNMP agents by exchanging
routing information (including the contents of each router's routing table),
with its neighbors. This automatic learning capability enables using any
network topology, including topologies with closed loops.
• When the management traffic is carried in a dedicated timeslot, Frame Relay
encapsulation in accordance with RFC 1490 is also used. This enables Frame
Relay routers to carry the management traffic to the managed FCD-E1LC.
Frame Relay encapsulation is used as follows:
 In the transmit direction, the SNMP agent encapsulates the management
messages in frames with a predetermined DLCI (always DLCI 100), and
sends them at the selected rate through the selected main and/or sublink
timeslot.
 In the receive direction, the SNMP agent monitors the specified timeslot,
analyzes packets received with DLCI 100, and analyzes the received data
to detect management messages (any such messages are then processed
as usual).
The FCD-E1LC management traffic router does not support Frame Relay
management protocols (ANSI T1.617 Annex D, LMI, etc.), nor is such support
required.
The RAD proprietary protocol is more bandwidth-efficient, therefore it is
recommended to use it whenever feasible. However, its bandwidth is limited and
therefore it cannot be used when a high management traffic load is expected (for
example, when management traffic directed to many other RAD equipment units
passes though the FCD-E1LC main link).
Note