Configuring Log Filters
Many event categories contain filters so you can further refine the type of information that the system logs. For example, when logging BGP connections, you can limit the information logged to a specific access class, peer, route map, or virtual router.
You define filters when you set the log severity for an event category. The online Help shows the options you can set for each filter.
 | Note: You can use the packet flow monitoring feature to create user-defined classification parameters that specify the packet data that is logged. See Packet Tagging Overview. |
The following example creates a filter that logs BGP connection information at the debug severity level on traffic that matches access list ListOne, and is incoming traffic to virtual router default.
host1(config)# log severity debug bgpevents ? access-class Select an access list for the filter in Select import/in direction for the filter out Select export/out direction for the filter peer Select a peer IP address for the filter route-map Select a route map for the filter router Identify an instance of a virtual router <cr> host1(config)# log severity debug bgpevents access-class ? WORD The access list host1(config)# log severity debug bgpevents access-class ListOne ? filtering-router Identify virtual router where access-class/route-map are defined in Select import/in direction for the filter out Select export/out direction for the filter route-map Select a route map for the filter <cr> host1(config)# log severity debug bgpevents access-class ListOne route-map ? WORD The route map host1(config)# log severity debug bgpevents access-class ListOne route-map default ? filtering-router Identify virtual router where access-class/route-map are defined in Select import/in direction for the filter out Select export/out direction for the filter <cr> host1(config)# log severity debug bgpevents access-class ListOne route-map default in
The next example limits the logging of PPP debug events to traffic to or from the POS interface in slot 2/0.
host1(config)#log severity debug ppp ? atm Specify an ATM PPP interface fastEthernet Specify a fastEthernet interface gigabitEthernet Specify a gigabitEthernet interface mlppp Specify an MLPPP network interface pos Specify a POS PPP interface serial Specify a serial PPP interface <cr> host1(config)#log severity debug ppp pos 2/0
To obtain a list of the filters available in each event category, see Unresolved xref.
