Beta Draft Confidential
Configuring Trunks
Configuring VNN OSPF
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000
1/19/05
7-61
Configuring VNN OSPF Name LSA Suppression
This section describes VNN OSPF Name LSA suppression and explains how to
configure it in a Lucent switch network.
About VNN Name LSA Suppression
For Lucent switches that use the PNNI protocol or require PNNI-VNN
interoperability, a Lucent VNN switch floods NAME(3) and SUMM_NM(3) type
LSAs over the VNN trunk interfaces. These LSAs bind the VNN switch IP address to
an ATM address so the PNNI and VNN switches can communicate. However,
generating these LSAs increases network traffic and consumes valuable CPU
utilization and bandwidth, which imposes unnecessary overhead on switches that do
not require PNNI-VNN interoperability.
You can suppress (disable) or enable the flooding of NAME(3) and SUMM_NM(3)
LSAs for a Lucent switch, depending on whether that switch interoperates with PNNI
switches in the network. If these LSAs are suppressed, they are not installed in the
VNN database nor flooded over VNN trunk interfaces. However, this suppresses only
the default VNN-network service access point (NSAP) address binding. Any other
node prefixes or port prefixes that you configure will still generate NAME(3) and
SUMM_NM(3) LSAs.
Enabling and Disabling VNN Name LSAs
To enable or disable Name LSA flooding on a CBX 500 or GX 550 switch:
1. Right-click on the Switch instance node for the switch you want to modify, and
select Modify from the pop-up menu.
The Modify Switch dialog box appears (
2. In the Administrative tab, check the VNN Optimized Flooding check box to
enable VNN OSPF optimized flooding on the switch. Enabling VNN OSPF
optimized flooding enables you to reduce the number of identical LSAs that are
flooded, received, and processed between Lucent switches in the same area
connected by multiple parallel trunks.
If you wish to disable VNN OSPF optimized flooding for this switch, clear the
check box. This is the default setting.
Note – To configure VNN OSPF Name LSA suppression, you must be running one of
the following minimum switch software releases:
•
CBX 500 switch software Release 08.00.03.00
•
GX 550 switch software Release 08.00.03.00
Summary of Contents for CBX 3500
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