Nortel Optical Multiservice Edge 6130, Planning Manual, Page: 225 / 292

Appendix A: Data communications planning 10-39
Planning Guide NT6Q92MA Rel 1.0 Iss 1 Standard September 2006
DCN example 4 - Using OSPF with dual OME6130 GNEs to external OSPF
backbone.
In this example (see Figure 10-9 on page 10-40 and Figure 10-10 on page
10-41 ), two OME6130 network elements are used as dual GNEs to establish
communication between the external DCN and the OME6130 sub-system.
Typically, the two gateway NEs are located in two different sites and subnets
to maximize the network resilience.
Multiple OME6130 sub-systems can be connected using Ethernet in between
the LAN ports to minimize the number of DCN sites required and to extend
the DCN coverage within the engineering limits.
When the OME6130 sub-system provides a resilient internal DCN structure
(e.g. ring with DCC) so that any link failure inside the ring will not result in
losing any connectivity to either of the gateway network elements, the external
DCN router, which is acting as the Area Border Router (ABR), can then be
configured to use the route summarization feature to group the IP routes for the
OME6130 sub-network into a single route covering all the OME6130 Router
ID IP addresses.
When the OME6130 sub-system does not provide a resilient internal DCN
structure (e.g. linear chain), route summarization should not be used at the
ABR or resilient communications will be lost.
Note: Two or more GNEs can be used within the engineering limits.
DCN provisioning details
Table 10-11 on page 10-42 , Table 10-12 on page 10-42 and Table 10-13 on
page 10-43 detail the DCN parameters for the DCN example 4 configuration.
Note: For parameters not listed, use the default settings.