Configuring Vnn Ospf - Lucent Technologies CBX 3500 Configuration Manual

Beta Draft Confidential

Configuring VNN OSPF

Lucent switches can perform routing tasks using IP and VNN routing software. Both
IP and VNN support the OSPF routing protocol. In previous releases of Lucent switch
software, VNN and IP shared the same OSPF software component to perform their
OSPF routing tasks. However, VNN and IP now have their own OSPF software
components, or instances. These instances are called VNN OSPF and IP OSPF.
Note – For details about how IP OSPF and VNN OSPF interoperate, as well as
step-by-step configuration procedures for IP OSPF, see the IP Services Configuration
Guide for CBX 3500, CBX 500, and B-STDX 9000.
VNN OSPF is supported in Lucent switches that are configured as autonomous system
border routers (ASBRs). In an autonomous system (AS) each switch belongs to an
area. Switches configured as ASBRs exchange routing information with other ASs via
external gateway routing protocols, such as Border Gateway Protocol (BGP). The
external route information collected through these protocols is then aggregated and
flooded through the AS.
VNN OSPF is typically configured over Lucent trunks. This section describes how to
configure loopback addresses, area aggregates, external route aggregates, and virtual
links for VNN OSPF. It also describes how to configure VNN OSPF optimized
flooding and VNN OSPF Name link state advertisement (LSA) suppression, which
enhance VNN OSPF performance.
Configuring VNN OSPF Loopback Addresses
To configure a VNN OSPF loopback address for a GX 550 or CBX 500 switch:
1. Expand the instance node for the switch to which you want to add a VNN OSPF
2. Expand the VNN class node.
3. Right-click on the VNN Loopback Addresses class node and select Add from the
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000
loopback address.
pop-up menu.
The Add VNN Loop back Address dialog box appears
Configuring Trunks
Configuring VNN OSPF
(Figure 7-19).
1/19/057-47