Logging Neighbors Going Up Or Down; Displaying Ospf Update Packet Pacing - Cisco FirePOWER ASA 5500 series Configuration Manual

Chapter 9 Configuring IP Routing

Logging Neighbors Going Up or Down

By default, the system sends a system message when an OSPF neighbor goes up or down.
Configure this command if you want to know about OSPF neighbors going up or down without turning
on the debug ospf adjacency command. The log-adj-changes router configuration command provides
a higher level view of the peer relationship with less output. Configure log-adj-changes detail if you
want to see messages for each state change.
To log neighbors going up or down, perform the following steps:
If you have not already done so, enter the router configuration mode for the OSPF process you want to
Step 1
configure by entering the following command:
hostname(config)# router ospf process_id
To configure logging for neighbors going up or down, enter the following command:
Step 2
hostname(config-router)# log-adj-changes [detail]
Note
The following example shows how to log neighbors up/down messages:
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:
•
•
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
OL-10088-01
Logging must be enabled for the the neighbor up/down messages to be sent.
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.
Cisco Security Appliance Command Line Configuration Guide
Configuring OSPF
9-17