Displaying Ospf Update Packet Pacing; Monitoring Ospf - Cisco PIX 500 Series Configuration Manual

Configuring OSPF
hostname(config)# router ospf 1
hostname(config-router)# log-adj-changes detail

Displaying OSPF Update Packet Pacing

OSPF update packets are automatically paced so they are not sent less than 33 milliseconds apart.
Without pacing, some update packets could get lost in situations where the link is slow, a neighbor could
not receive the updates quickly enough, or the router could run out of buffer space. For example, without
pacing packets might be dropped if either of the following topologies exist:
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Pacing is also used between resends to increase efficiency and minimize lost retransmissions. You also
can display the LSAs waiting to be sent out an interface. The benefit of the pacing is that OSPF update
and retransmission packets are sent more efficiently.
There are no configuration tasks for this feature; it occurs automatically.
To observe OSPF packet pacing by displaying a list of LSAs waiting to be flooded over a specified
interface, enter the following command:
hostname# show ospf flood-list if_name

Monitoring OSPF

You can display specific statistics such as the contents of IP routing tables, caches, and databases. You
can use the information provided to determine resource utilization and solve network problems. You can
also display information about node reachability and discover the routing path that your device packets
are taking through the network.
To display various OSPF routing statistics, perform one of the following tasks, as needed:
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Cisco Security Appliance Command Line Configuration Guide
9-18
A fast router is connected to a slower router over a point-to-point link.
During flooding, several neighbors send updates to a single router at the same time.
To display general information about OSPF routing processes, enter the following command:
hostname# show ospf [ process-id [area-id] ]
To display the internal OSPF routing table entries to the ABR and ASBR, enter the following
command:
hostname# show ospf border-routers
To display lists of information related to the OSPF database for a specific router, enter the following
command:
hostname# show ospf [ process-id [ area-id ]] database
To display a list of LSAs waiting to be flooded over an interface (to observe OSPF packet pacing),
enter the following command:
hostname# show ospf flood-list if-name
To display OSPF-related interface information, enter the following command:
hostname# show ospf interface [ if_name ]
To display OSPF neighbor information on a per-interface basis, enter the following command:
Chapter 9 Configuring IP Routing
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