Nortel Optical Multiservice Edge 6130, Planning Manual, Page: 236 / 292

10-50 Appendix A: Data communications planning
Optical Multiservice Edge 6130 NT6Q92MA Rel 1.0 Iss 1 Standard September 2006
DCN example 6 - Using single OM4000 GNE with GRE tunnels through
OM4000 network to reach remote OME6130 network elements in SNCP
ring with an OM4000 network element.
In this example (see Figure 10-13 on page 10-51 and Figure 10-14 on page
10-52 ), a single ABR is used at the DCN gateway site to establish
communication between the external DCN and the OME6130/OM4000
sub-systems.
A single OM4K is connected to the external DCN via an OSI only enabled port
and acts as the GNE for the other OM4K network elements.
For configurations with fully robust (meshed/ring) internal DCN connectivity
Data communication to the remote subtending OME6130 network elements is
achieved using IP over OSI GRE tunnels through the OM4K network and these
tunnels are terminated directly on the ABR. In order to provide resilient data
communication against any fiber breaks in the OME6130 system, two tunnels
are required from the ABR through the OM4KGNE. iISIS routing is used to
establish communication to all OME6130 within the ring.
Note 1: Static route is recommended over OSPF routing on the GRE
tunnel to the router, if iISIS routing is used between OME6130 network
elements.
Note 2: If the Ethernet IP of the OME6130 NEs are provisioned with
different subnets, then dynamic routing (i.e. OSPF or iISIS) or static
routing is required between the OME6130 NEs and the DCN routers.
For configurations with non-redundant (linear) internal DCN connectivity
Data communication to the remote subtending OME6130 network elements is
achieved using IP over OSI GRE tunnels through the OM4K network and these
tunnels are terminated directly on the ABR. In order to provide resilient data
communication against any fiber breaks in the OME6130 system, two tunnels
are required from the ABR through the OM4K GNE. OSPF routing is used to
establish communication to all OME6130 within the subtending ring.
Note: OSPF routing on the GRE tunnel to the router, and OSPF routing is
used between OME6130 network elements can be used.
The ABR on which the IP over OSI GRE tunnels terminate can only be a Cisco
router that supports ISO CLNS, with an IOS which has the “IP over CLNS
tunnel (CTunnel)” using
GRE encapsulation feature. Some older versions of
IOS support IP over OSI tunnels using Cisco proprietary encapsulation which
is not suitable in this application.
DCN provisioning details
Table 10-16 on page 10-52 and Table 10-17 on page 10-54 detail the DCN
parameters for the DCN example 6 configuration.
Note: For parameters not listed, use the default settings.