Specifications

8-2
Cisco MGX 8800/8900 Series Software Configuration Guide
Release 5.1, Part Number OL-6482-01, Rev. A0, January 25, 2005
Chapter 8 Managing PNNI Nodes and PNNI Routing
Managing PNNI Nodes
Creating Upper Level Peer Groups
Upper level peer groups enable routing from one PNNI peer group to another. If you are managing a
single peer group WAN, you do not need to create upper level peer groups.
Note The “Configuring PNNI Node Parameters” section in Chapter 2, “Configuring General Switch
Features,” describes how to configure the lowest level peer group parameters, which many upper level
peer group parameters are based on. You should configure the basic PNNI node parameters before
creating upper level peer groups.
After you configure the lowest level PNNI nodes, all nodes within the same peer group can communicate
with each other. All you need to do to enable communications between two nodes in a peer group is to
add a PNNI trunk between them as described in Chapter 3, “Provisioning PXM1E Communication
Links.” To enable routing between different peer groups at the same level, you must create one or more
upper level peer groups.
The actual procedure for creating an upper level peer group for your WAN depends on the structure of
your WAN. This section shows how to create an upper level peer group for the WAN shown in
Figure 8-1.
Figure 8-1 Example Hierarchical PNNI Network Topology Showing a Two-Level Hierarchy
In Figure 8-1, the five level-56 peer groups are isolated from each other until the upper level peer group
is created. The members of the upper level peer group are the peer group leaders from the lower level
peer groups. To create an upper level peer group, you need to configure the peer group leaders and add
the upper level PNNI process to each peer group leader (PGL) node. It is also a good practice to
configure secondary peer group leaders that can take over if a PGL fails.
To configure peer group leaders, use the following procedure.
Step 1 Establish a configuration session using a user name with SUPER_GP privileges or higher.
66059 PNNI networks
Peer group 1
Peer
group 3
Peer
group 4
peer
group 5
Peer
group 5
Level 40
Level 56
Peer
group 2
Peer
group 2