Beta Draft Confidential
OSPF Name Aggregation
Using OSPF Name Aggregation
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000
1/19/05
G-3
As the network operator, you provision prefixes and addresses on Lucent equipment
UNI ports to support customer premise equipment (CPE) routing requirements. The
CPE can be any equipment (e.g., switches or routers) that supports SVCs (or SPVCs).
shows the addresses that require routing in the sample network shown in
You must decide how best to use prefixes and addresses to accommodate the routing
needs of the CPE users that are associated with these addresses. This example uses
E.164 addresses, but the procedures described in this appendix also apply to other
addressing formats (e.g., X.121, DCC, ICD).
In the sample network, assume that one thousand port addresses are possible on the
CPE UNI#1-1, and all of these addresses start with 978555. Provisioning all one
thousand addresses as separate port addresses on UNI#1-1 would accommodate the
routing requirements for these addresses. However, this approach has the following
disadvantages:
•
You must manually enter one thousand address values.
•
The OSPF creates a separate name for each address. Propagating all names in the
OSPF database throughout the network would consume a significant amount of
memory at the host switch and at remote switches in the network.
The following sections describe two OSPF name aggregation approaches that can
reduce memory consumption when provisioning addresses in the sample network.
Port-level Name Aggregation
Instead of provisioning many individual port addresses in the sample network, you
could provision a single port prefix, 978555, which is the value that all the CPE
UNI#1-1 port addresses have in common in the sample network. The OSPF name for
this port prefix would then route all SVCs (or SPVCs) from the CPE UNI#1-1 port to
their destination ports. This method saves provisioning time and requires only one
port-prefix OSPF name rather than many port-address OSPF names.
Table G-1.
Address Routing Requirements for Sample Network
Switch
Port
Addresses That Require Routing
1
UNI#1-1
9785551000 through 9785559999
1
UNI#1-2
9786661000 through 9786669999
2
UNI#2-1
5085551000 through 5085559999
3
UNI#3-1
6175551000 through 6175559999
Summary of Contents for CBX 3500
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