Nortel Optical Multiservice Edge 6130, Planning Manual, Page: 230 / 292

10-44 Appendix A: Data communications planning
Optical Multiservice Edge 6130 NT6Q92MA Rel 1.0 Iss 1 Standard September 2006
DCN example 5 - Using single OM4000 GNE with GRE tunnels through
OM4000 network to reach remote OME6130 network elements in linear
spurs off OM4000 NE.
In this example (see Figure 10-11 on page 10-45 and Figure 10-12 on page
10-46 ), the OME6130 is subtended as 1+1 MSP link with OM4000 and IP
static routing between the router and OME6100 is possible using GRE tunnel.
The router has a static route over the GRE tunnel to the router ID IP address of
the OME6100 NE and the OME6100 NE has a static route over the GRE
tunnel to the router.
Note 1: In some configurations, static route is recommended over OSPF
routing on the GRE tunnel to the router, as route redistribution between
iISIS and OSPF is not currently supported on OME6130.
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 resiliency, a separate OSI GRE tunnel is needed from the external router
to each of the OME6130 network elements (allowing use of static routing or
OSPF routing over SGRE). If resiliency is not required, then only one static IP
over OSI GRE tunnel can be provisioned from the router to one of the
OME6130 NEs. In this configuration, only static routing can b used over the
SGRE). Communication to the other OME6130 NE is established using iISIS
routing through the OM4000 NE.
The external router redistributes the static IP route into a dynamic routing
protocol, in order to advertise the OME6130 router IP addresses to the external
DCN.
The router 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 10-14 on page 10-46 and Table 10-15 on page 10-48 detail the DCN
parameters for the DCN example 5 configuration.
Note: For parameters not listed, use the default settings.