Ospf Network Types; Figure 2: Ospf Network Type - Avaya 8600 Engineering

4. OSPF Network Types

OSPF Network Types were created to allow OSPF neighboring between routers over different types of
network infrastructures. That being the case, each interface can be configured to support each network
type. The following table defines the network types and usages that the Ethernet Routing Switch 8600
supports.
Interface Type
Broadcast
Non-Broadcast Multi-
Access
Passive
Configuring OSPF Network Type:
The OSPF Network type can be configured by using the following command:
config ethernet x/y ip ospf interface-type ({broadcast | nbma | passive}
Where:
x = slot #
y = port #
Config Example – OSPF Network Type
For this example, we will configure VLAN 2 on PP8600A with OSPF and set the interface type as passive.
By configuring VLAN 2 as passive, no OSPF hello messages will be sent on this segment while still
advertising this interface to the rest of the OSPF network.
Configure OSPF Interface – brouter port
Step 1
config vlan 2 create byport 1
config vlan 2 ports add 1/2
November 2010
Usage
Will automatically discover every OSPF router on the network by sending OSPF Hello‟s
to the multicast group AllSPFRouters (224.0.0.5). Neighboring is automatic and need
not be configured. Typically used in an Ethernet, ATM, or certain Frame Relay
environments.
OSPF NBMA network type was used to correctly model network environments that do
not have native Layer 2 broadcast/multicast capabilities, such as Frame Relay and X.25.
Hellos are unicasted to manually configured neighbors.
Allows interface network to be included in OSPF without generating LSAs or forming
adjacencies. Typically used on an access network, or on an interface that is used for
BGP peering. This also limits the amount of CPU cycles required to process Dijkstra.

Figure 2: OSPF Network Type

ERS 8600 / 8800 OSPF Technical Configuration Guide
These commands create a port-based VLAN 2 under
STG 1 with OSPF enabled and sets the interface type as
passive.
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