Net Insight Nimbra One User Manual page 86

84 • DTM Configuration
©2006 Net Insight AB, All rights reserved
Figure 80. Dynamic routing
2. Click on Dynamic routing config, Figure 81, will appear.
Figure 81. Routing entries
The goal of DRP is to find the lowest-cost path from source node to destination
node. The cost of a path is defined as the sum of the cost of all switches and
outgoing interfaces that the path uses. A good base-configuration for DRP is to
set the cost of all outgoing interfaces to 1 and the cost for passing through all
nodes to 0. This means that the lowest-cost path will always be the path that
passes through the least number of links. In some circumstances, the operator
might have a different opinion on what the lowest-cost path is. It is then
possible to classify some links or switches as " more expensive" than other
links. This is done via a set of configuration variables called " metrics" .
Changes to the Metric settings in a node will be automatically propagated to all
other nodes in the network and they will update their routing tables accordingly.
This process can however take some time (on the order of seconds in smaller
networks) before all nodes have received the new information. Changes to
metrics do not affect channels that are already established.
•
Node metric: The cost of switching a channel in this node.
•
Interface metric: The cost of setting up a channel out via this interface.
Element Manager User's Manual Nimbra OneSerie