A-11
ATM Switch Router Software Configuration Guide
OL-7396-01
Appendix
Adding a New Lowest Level of PNNI H ierarchy
FigureA-5 Moving a Switch Down in the PNNI Hierarchy
Although ATM switch router SanFran.BldA.T5 and NewYork.BldB.T3 are not running any PGLs or
LGNs in this example, these ATM switch routers must be capable of establishing th e PNNI hierarchy.
This capability allows them to bring up the induced horizontal links to the LGN SanFran, maintaining
PNNI connectivity across the network. For this reason, we recommend tha t you upgrade all ATM switch
routers to Cisco IOS Release 11.3T, WA4 or later, before configuring PNNI hierarchy.
The following example shows how to move switch SanFran.BldA.T4 down into a new peer group:
SanFran.BldA.T4# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
SanFran.BldA.T4(config)# atm router pnni
SanFran.BldA.T4(config-atm-router)# node 2 level 56
SanFran.BldA.T4(config-pnni-node)# name SanFran
SanFran.BldA.T4(config-pnni-node)# no auto-summary
SanFran.BldA.T4(config-pnni-node)# exit
SanFran.BldA.T4(config-atm-router)# node 1
SanFran.BldA.T4(config-pnni-node)# election leadership-priority 45
SanFran.BldA.T4(config-pnni-node)# node 1 disable
SanFran.BldA.T4(config-pnni-node)# node 1 level 72
SanFran.BldA.T4(config-pnni-node)# parent 2
SanFran.BldA.T4(config-pnni-node)# node 1 enable
SanFran.BldA.T4(config-pnni-node)# end
SanFran.BldA.T4#
Note When you move down the first switch into a new peer group, the ATM switch router cannot establish
new connections until it can elect itself PGL. By default, this election process takes approximately
90 seconds, or less if a second ATM switch router is brought into the peer group quickly. After the new
configuration on this ATM switch router is stable, the PNNI network is fully functional and new
connections can be accepted across all ATM switch routers.
SanFran
T4
SanFran.BldA.T4
T4
SanFran.BldA.T5
T5
NewYork.BldB.T2
NewYork.BldB.T1
T2
T1
NewYork.BldB.T3
T3
Level 56
Level 72
10223
Physical links
Induced horizontal links
Logical group godes (LGNs)
Peer group leaders (PGLs)
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