Alcatel-Lucent 1643 AMS User's Operation Manual page 110

Management communication setup
The NEs need to be configured with one IP address on the LAN side, connected to the
IP subnet with the IP NEs. The LAN can be used for both OSI and IP traffic. The
same Ethernet address will be used for both protocols.
IP encapsulation
The IP packets are encapsulated in Connectionless Network Protocol (CLNP) packets
which are routed through the OSI-only node which routes the CLNP packets as
normal, totally oblivious of the CLNP packets contents.
IP and DCC
A benefit of the tunneling approach, is that IP need not to be carried on the DCC. Only
the CLNP packets (possibly carrying IP) go on to the DCC.
IP routing
In the Dual Stack with Tunnelling configuration, a second network layer entity (the IP
router) is added alongside the existing OSI network layer entity (CLNP). The CLNP
entity has the routing tables and the mechanisms to automatically populate them -
namely the IS-IS and ES-IS dynamic routing protocols.
This is not the case for the IP routing tables since there is no IP dynamic routing
protocol to populate the IP routing tables. IP routing tables have to be manually
provisioned by the operator.
DSwT routing table
A Routing Table, IP, or OSI, is divided into two columns:
• "Final Destinations" of each Network Node,
• for each Final Destination, the identity of the "Next Hop" which is the next
network node in the path towards the Final Destination.
The table below shows a simplified IP routing table for IP router in a DSwT stack. It
is divided into two main columns. These two parts of the routing table will be
discussed separately.
Final Destination
130.44.5.0/24
120.23.4.0 / 24
150.35.10.0 / 24
150.35.20.0 / 24
160.22.0.0 / 16
....................................................................................................................................................................................................................................
4-20
Subnetwork
LAN 0
LAN 0
DCC 1
DCC 2
CLNP-Tunnel
Alcatel-Lucent - Proprietary
See notice on first page
Dual stack with tunneling (DSwT)
Next Hop
Node
<local>
130.44.5.8
-
-
NSAP (node X)
365-312-807R7.2
Issue 4, May 2007