Contents

Configuring fast log output 1

About fast log output 1

Log header formats· 1

Log field description· 2

Restrictions and guidelines: fast log output configuration· 2

Configuring fast output of logs to log hosts· 3

Configuring fast log output to use the UTF-8 encoding· 4

Fast log output configuration examples· 4

Example: Configuring fast log output to a log host 4

 

Configuring fast log output

About fast log output

The fast log output feature enables fast output of logs to log hosts.

Typically, logs generated by a service module are first sent to the information center, which then outputs the logs to the specified destination (such as to log hosts). When fast log output is configured, logs of service modules are sent directly to log hosts instead of to the information center. Compared to outputting logs to the information center, fast log output saves system resources. For more information about the information center, see "Configuring the information center."

Logs are classified into eight severity levels from 0 through 7 in descending order.

Table 1 Log levels

Severity value	Level	Description
0	Emergency	The system is unusable. For example, the system authorization has expired.
1	Alert	Action must be taken immediately. For example, traffic on an interface exceeds the upper limit.
2	Critical	Critical condition. For example, the device temperature exceeds the upper limit, the power module fails, or the fan tray fails.
3	Error	Error condition. For example, the link state changes.
4	Warning	Warning condition. For example, an interface is disconnected, or the memory resources are used up.
5	Notification	Normal but significant condition. For example, a terminal logs in to the device, or the device reboots.
6	Informational	Informational message. For example, a command or a ping operation is executed.
7	Debugging	Debug message.

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Log header formats

The log header formats of fast output logs are as follows:

Table 2 Log header formats

Log header types	Format
Standard format	<PRI> Timestamp AppName %%10 SN:sn Example: <134> Apr 28 15:35:32 2020 H3C %%10 SN:10056879 VsysId:1
Customized format	URL filtering UNICOM format: PRI Vision HostName Timestamp AppName MsgID HostName Len Example: 142 1 100.0.0.1 2020 Apr 28 15:35:43 H3C NAT444:SessionU 57 NAT CMCC format: <PRI> Vision HostName Timestamp AppName ProcID MsgID Example: <142> 1 100.0.0.1 2020 Apr 28 15:35:32 H3C - NAT444:SessionA NAT UNICOM format: <PRI> Vision HostName Timestamp AppName ProcID MsgID Example: <142> 1 100.0.0.1 2020 Apr 28 15:35:43 H3C - NAT444:SessionA NAT TELECOM format: <PRI> Vision Timestamp HostName AppName ProcID MsgID Example: <134> 1 2020 Apr 28 15:35:38 100.0.0.1 H3C - NAT444:sessionbasedA

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Log field description

Table 3 Log field description

Field	Description
PRI	Log type code. ·     Standard format and NAT UNICOM format: 134. ·     URL filtering UNICOM format, NAT CMCC format, and NAT TELECOM format: 142.
Timestamp	Records the time when the log was generated. The timestamp is in the format of YYYY Mon DD hh:mm:ss.
AppName	Name of the device that generated the log.
%%10	Vendor of the device that generated the log.
SN	Serial number of the device that generated the log. To view the device serial number, see the DEVICE_SERIAL_NUMBE field in the output of the display device manuinfo command. This field is available only when the device is configured to carry the serial number in fast output logs by using the customlog with-sn command.
HostName	Source IPv4 address of the device that generated the log.
MsgID	Log type.
Len	Total length of the log header, in bytes.
ProcID	Hyphen (-).

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Restrictions and guidelines: fast log output configuration

The device supports outputting logs from service modules to log hosts by using the following methods in descending order of priority:

1.     Fast log output.

2.     Flow log. For more information about flow log and the service modules supported by flow log, see "Configuring flow log."

3.     Information center.

If you configure multiple log output methods for a service module, the service module outputs its logs in the method that has the highest priority.

To output NAT logs to a log host, you must specify the log format required by the log host in the customlog format and customlog host commands.

Configuring fast output of logs to log hosts

1.     Enter system view.

system-view

2.     Enable fast log output.

customlog format { aft | aft-cmcc | aft-unicom | attack-defense | dns | dpi [ anti-virus | audit | ip-reputation | ips [ sgcc ] | netshare | url-filter [ unicom ] | waf ] | keepalive sgcc | lb | nat { cmcc | telecom | unicom } | packet-filter [ sgcc ]| scd | security-policy sgcc | session }

By default, fast log output is disabled.

Support for the dpi, lb, and nat keywords depends on the device model. For more information, see the command reference.

3.     Configure fast log output parameters.

customlog host [ vpn-instance vpn-instance-name ] { hostname | ipv4-address | ipv6 ipv6-address } [ port port-number ] export { aft | attack-defense | cmcc-sessionlog | cmcc-userlog | dns | dpi [ anti-virus | audit | ip-reputation | ips | netshare | url-filter | waf ] * | keepalive | lb | packet-filter | scd | security-policy | session | telecom-sessionlog | telecom-userlog | unicom-sessionlog | unicom-userlog } *

By default, no fast log output parameters are configured.

The value for the port-number argument must be the same as the port number configured on the log host. Otherwise, the log host cannot receive logs.

Support for the dpi, lb, telecom-sessionlog, telecom-userlog, unicom-sessionlog, and unicom-userlog keywords depends on the device model. For more information, see the command reference.

4.     (Optional.) Specify the source IP address for fast log output.

customlog host source interface-type interface-number

By default, the source IP address of fast output logs is the primary IP address of the outgoing interface.

If this command is configured, the primary IP address of the specified interface is used as the source IP address of fast output logs regardless of the outgoing interface.

Configure this command when you need to filter logs by source IP address on the log host.

5.     (Optional.) Configure the timestamp of fast output logs to show the system time.

customlog timestamp localtime

By default, the timestamp of fast output logs shows the Greenwich Mean Time (GMT).

Configuring fast log output to use the UTF-8 encoding

About this task

The fast log output module and the log host must use the same character set encoding. If they use different encodings, the log host cannot correctly display Chinese characters in the log messages received from the fast log output module. By default, fast log output uses the GB18030 encoding. You can perform this task to configure fast log output to use the UTF-8 encoding.

Procedure

1.     Enter system view.

system-view

2.     Configure fast log output to use UTF-8 encoding.

customlog character-encoding utf-8

By default, fast log output uses the GB18030 encoding.

Fast log output configuration examples

Example: Configuring fast log output to a log host

Network configuration

As shown in Figure 1, configure fast log output on the device to send session logs to the log server.

Figure 1 Network diagram

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Procedure

1.     Assign IP addresses to interface GigabitEthernet 1/0/2.

<Device> system-view

[Device] interface gigabitethernet 1/0/2

[Device-GigabitEthernet1/0/2] ip address 1.1.0.1 255.255.0.0

[Device-GigabitEthernet1/0/2] quit

2.     Configure settings for routing.

This example configures a static route, and the next hop in the router is 1.1.0.2.

[Device] ip route-static 1.2.0.0 16 1.1.0.2

3.     Add interface GigabitEthernet 1/0/2 to security zone untrust.

[Device] security-zone name untrust

[Device-security-zone-Untrust] import interface gigabitethernet 1/0/2

[Device-security-zone-Untrust] quit

4.     Configure a security policy:

# Configure a rule named loglocalout to allow the device to send fast log output messages to the server.

[Device] security-policy ip

[Device-security-policy-ip] rule name loglocalout

[Device-security-policy-ip-1-loglocalout] source-zone local

[Device-security-policy-ip-1-loglocalout] destination-zone untrust

[Device-security-policy-ip-1-loglocalout] source-ip-host 1.1.0.1

[Device-security-policy-ip-1-loglocalout] destination-ip-host 1.2.0.1

[Device-security-policy-ip-1-loglocalout] action pass

[Device-security-policy-ip-1-loglocalout] quit

[Device-security-policy-ip] quit

5.     Configure fast log output. Enable fast log output, configure log output to the log server, and enable logging for session creation and deletion. Enable IPv4 session logging in the inbound direction of the interface connected to the internal network.

[Device] customlog format session

[Device] customlog host 1.2.0.1 port 1000 export session

[Device] session log flow-begin

[Device] session log flow-end

[Device] interface gigabitethernet 1/0/1

[Device-GigabitEthernet1/0/1] session log enable ipv4 inbound

Verifying the configuration

On the server, verify that logs are received from the device successfully.