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Converged network design
Issue 6 January 2008 309
Figure 85: Redundant connections
It is good practice to have the redundant boards of each PN connected to redundant Layer 2
switches as shown to protect each PN from failure of the Layer 2 switch itself. If asymmetric
redundancy is configured through IP bearer duplication, it is essential for proper fail over
operation that the active and standby TN2602 boards have equivalent Layer 2 connectivity. In
the case of IP bearer duplication the secondary TN2602 takes over by assuming both the L2
and L3 address of the connection terminations. This minimizes the disruption due to fail over
[10] but requires the network to be configured to accommodate the apparent “move” of an end
point from one switch to the other, as it normally would for a spanning tree change.