Net Insight Nimbra 300 Series, Руководство пользователя

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Element Manager User’s Manual Nimbra OneSerie Control Network
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©2006 Net Insight AB, All rights reserved
Client to Server Channels and Server to Client Channels are used for broadcast
packets, and for DLE signaling.
Client to Client Channels are used for peer-to-peer communication.
Note: To change the IP address on the physical interface, refer to the
Nimbra Installation and Maintenance Manual, Section Setting
Initial Parameters.
DLE server
Each DLE segment has a DLE server. The responsibility of the server is to
provide information to the clients about the other nodes in the segment, and
thus aid the clients in establishing their connections. Because the client and
server must be able to at all time communicate, permanent channels are
established between client and the server. One channel is established from each
client to the server, and one multicast channel is established from the server to
all the clients.
The channels between server and clients are also used when distributing
broadcast packets. The broadcast packets from a client are sent to the server,
which distributes it to all the other clients on the segment using the multicast
channel from the server to the clients. I.e. broadcast packets will not result in
establishment of new channels between two clients. Packets are also distributed
in the same way if the channel from one client to the other client is not
established. Typically, this would be during the period when a channel is being
established.
Multiple DLE servers
It is possible to use multiple servers for a single segment. The servers co-
operate and allows for redundancy.
At all time, a client is connected to only one server. When multiple servers are
used, the servers are interconnected using multicast channels, one in each
direction. Client packets that would be sent via the server to other clients are
also replicated by the server and sent to the peering servers for distribution to
their connected clients.
Setting up a segment with multiple servers, and where sets of clients are
connected to different servers implements redundancy between servers.
Multiple servers can be used as alternative servers for the client. For each
client, it is possible to configure alternative servers, where the alternative
servers must serve the same segment. When a client establishes a channel to a
server, it will try the servers in order until successful. If a server would go
down, the client establishes a new channel to a server, trying them in order
until successful. This implements redundant servers.
Configuration
The management traffic requires only moderate bandwidth. It is therefore
adequate to use 512 kbps (equals one DTM slot) per channel. As the DLE