OSPF Configuration
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Alcatel-Lucent
Beta Beta
OmniAccess 5740 Unified Services Gateway CLI Configuration Guide
TO CONFIGURE OSPF NETWORK TYPE
By default, OSPF classifies different media into the following three types of
network:
• Broadcast networks: Ethernet, Token Ring and FDDI
• NBMA (Non-Broadcast Multiple Access) networks: SMDS (Switched Multimegabit
Data Service), Frame Relay and X.25
• Point-to-point networks: (HDLC) High-Level Data Link Control and PPP
You have the choice of modifying interface type regardless of the default media
type.
E
XAMPLE
ALU(config-if GigabitEthernet3/0)# ip ospf network non-
broadcast
LSA G
ROUP PACING
The OSPF LSA group pacing feature allows the router to group OSPF LSAs and
pace the refreshing, checksumming, and aging functions. Group pacing results in
more efficient use of the router. Group pacing avoids sudden increases in the
CPU usage and network resources. This feature is most beneficial to large OSPF
networks. By default, the OSPF LSA group pacing is enabled.
Original LSA Behavior
Each OSPF LSA has an age, which indicates the validity of the LSA. Once LSA
reaches the maximum age (1 hour), it is discarded. During the aging process, the
originating router sends a refresh packet every 30 minutes to refresh the LSA.
Refresh packets are sent to keep the LSA from expiring, whether there has been
a change in the network topology or not. Checksumming is performed on all LSAs
every 10 minutes. The router keeps track of the LSAs it generates and the LSAs it
receives from other routers. The router refreshes the LSAs it generated and ages
the LSAs it received from other routers.
Command (in ICM) Description
ip ospf network
{broadcast|non-broadcast|
point-to-multipoint|point-to-
point}
Configures the OSPF network type for a
specified interface.
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