Alcatel-Lucent 1643 AMS User's Operation Manual page 99

Management communication setup
Undivided network definition
An undivided network consists of a single routing domain. There is no division
between the nodes at the network protocol level. All nodes in the network and
especially the Intermediate Systems can exchange routing information with each other.
Although a network element can only be managed by one ITM-SC at a time, the IS-IS
protocol is running between all nodes in the network. This leads to the exchange of
LSPs between all Intermediate Systems of the network.
IS-IS clustered DCN
In order to avoid the decrease of performance, the exchange of LSPs over a certain
port can be disabled in some nodes. A node can exchange LSPs over its DCC or LAN
(10BaseT) ports. The exchange of LSPs over the DCC channel can be disabled.
However, this also prevents the exchange of management data over this port and
prevents the use of this DCC port for re-routing in case of a failure of another port.
Disabling exchange of LSPs
Another option is to disable the exchange of LSPs over the LAN (10BaseT) port. This
can be done by choosing the IS to have a NO-IS-IS port. This node is also referred to
as a NO-IS-IS (gateway) node. If this is done for all Intermediate Systems on a LAN,
the LAN becomes a NO-IS-IS LAN. In NO-IS-IS LANs, the IS-IS protocol is not run
on the 10BaseT. This prevents the exchange of LSPs between Intermediate Systems on
a 10BaseT. This results in a network which comprises several clusters of nodes.
Between the clusters there is no IS-IS traffic.
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365-312-807R7.2
Issue 4, May 2007
Alcatel-Lucent - Proprietary
See notice on first page
DCN configurations
4-9