Cabletron Systems 04-0053-01 manual Adding a third Pnni node for next level connectivity

Multi-level PNNI Topology PNNI Routing

2.Add a third node (at level 64) to either switch SWA3 or SWB3.

3.Use the set pnnipglelection command to designate the switch’s second node (not third) as the PGL for the parent peer group, and specify the third node as the parent node of the second.

4.Perform steps 2 and 3 for switches with the same role in the other level 72 parent groups.

These steps create a grandparent group at level 64, and establishes a virtual link between the LGNs that represent the LGNs at level 72 (see Figure 3-3).

Third node

	Level 64
	Grandparent Group
SWA3	Virtual Link
LGN	LGN

Second node

SWA3 Virtual Link	Level 72	Virtual Link
PGL		PGL
	Parent Groups

First nodes

SWA3SWB3

PGL PGL PGL PGL

Level 80

Lowest Peer Groups

Figure 3-3 Adding a third PNNI node for next level connectivity

3-8 SmartSwitch ATM User Guide