Beta Draft Confidential
G-61/19/05 ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000
OSPF Name Aggregation
Network Hierarchical Addressing Plans
Assume that 1,000 addresses are possible at each of the switches in Figure G-2. If you
do not use OSPF name aggregation, the OSPF name database for this small network
may contain more than 3,000 names. This number may surpass the OSPF names
limitations stated in the SRN.
As another option, you can use node prefix name aggregation to create a much smaller
OSPF name database, thereby saving memory on all of the network switches. Using
node prefixes for the sample network in Figure G-2 reduces the size of the OSPF name
database to the product of the number switches in the network multiplied by the
number of node prefixes per switch (plus any non-aggregated names).
You can also have multiple node prefixes on a switch (not shown in Figure G-2). With
this solution, node prefixes may cover all possibilities. However, you must maintain
the hierarchical addressing plan and ensure that the same node prefix does not exist on
more than one switch.
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