Every control point feeds end system addresses (that do not share the switch's 13 byte address prefix) to
its PNNI subsystem which represents them by corresponding summary addresses if these are already
configured.
Configuring a new summary address can affect the functioning of previously configured summary
addresses. In the following example, assume that you have configured an external summary address
39.aa.bb, and that you have also set the following reachable external addresses:
39.aa.bb.cc.45.63...
39.aa.bb.cc.64.32...
39.aa.bb.cc.46.39...
then all 3 external addresses will automatically be represented in PNNI by the address prefix 39.aa.bb of
the configured summary address. If you now set a second external summary address to 39.aa.bb.cc then
PNNI will automatically migrate the three external addresses to the new summary address. The result is
that the three addresses are now represented by the new summary address prefix 39.aa.bb.cc and the old
summary address 39.aa.bb is unused although it remains stored in PNNI. The reason for this is that all
address to summary address associations are computed on the basis of longest matching prefix and
39.aa.bb.cc is a longer match than 39.aa.bb. You could reactivate the summary address 39.aa.bb by
setting the following group of external reachable addresses:
39.aa.bb.ff.45.63...
39.aa.bb.ff.64.32...
which cannot be represented by the address prefix 39.aa.bb.cc.
Chapter 6. Configuring PNNI Parameters
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