Chapter 10 Managing PNNI Routing
124 Avaya M770 ATM Switch User’s Guide
PNNI Global Topology Information
General topology information
To show the global topology information, use the following command:
The output of this command provides tabular general information about the entire
PNNI domain: number of horizontal links, nodes and reachable addresses, and the
number of PTSEs in the local database. It distinguishes between horizontal links
that are routable and those that are not routable. A horizontal link is a bi-directional
connection between two adjacent PNNI nodes. The information about a link is
derived from two Horizontal Link PTSEs which represent the two uni-directional
connections. A link may be non-routable if:
• The paired link (the link on the other direction) doesn’t exist, i.e. a Horizontal
Link PTSE describing the other direction doesn’t appear in the local database.
• The remote node doesn’t appear in the local database (it’s Nodal Info PTSE was
not received).
Note: In heirarchical PNNI configuration, uplinks known to this node are not
shown in the output above. To see Uplinks information, see the Global Topology
Uplink command on page 130.
In addition, the table distinguishes between nodes that are reachable, and those that
are not reachable. Reasons for a node to be non-reachable are:
• One or more PTSEs generated by this node were received at the local node, but
the Nodal Info PTSE of that node was not one of them.
• The Nodal Info PTSE of that node was received, however, there is no valid route
to that node. A route may be non-valid if one or more links on that route are
non-routable.
• A node may be non-reachable if one of the nodes on the path is a non-transit
node.
Reachable addresses are grouped to Internal and Exterior Reachable Addresses
(RAs). Internal RAs are ATM addresses that are part of the PNNI domain. The
switches learned them using ILMI and advertised them in Internal RA IGs. Exterior
RAs are ATM addresses that are not part of the PNNI domain. They were learned
Command: M15-155s2/>route pnni topology general
Output: Global PNNI topology information
+------------------+-------------------+--------------------+-------+
| Horizontal Links | Nodes | Reachable Addresses| Ptses |
+--------+---------+---------+---------+---------+----------+-------+
| |Not | |Not | | | |
|Routable|Routable |Reachable|Reachable| Internal|Exterior | |
+--------+---------+---------+---------+---------+----------+-------+
| 2| 0 | 4| 0 | 9| 3| 22|
+--------+---------+---------+---------+---------+----------+-------+