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2022-09-25
MRTG教程（五）：MRTG的配置参考指南
MRTG教程（五）：MRTG的配置参考指南
mrtg的配置参考指南
内容
NAME OVERVIEW SYNTAX GLOBAL KEYWORDS OPTIONAL GLOBAL KEYWORDS EXAMPLES
NAMEmrtg-reference - MRTG 2.12.2 configuration reference
OVERVIEWThe runtime behaviour of MRTG is governed by a configuration file. Run-of- ther-mill configuration files can be generated with cfgmaker. (Check the cfgmaker manpage). But for more elaborate configurations some hand-tuning is required.
This document describes all the configuration options understood by the mrtg software.
SYNTAXMRTG configuration file syntax follows some simple rules:
Keywords must start at the beginning of a line.
Lines which follow a keyword line which start with a blank are APPended to the keyword line
Empty Lines are ignored
Lines starting with a # sign are comments.
You can add other files into the configuration file using:
Include: file
Example:
Include: base-options.inc
If included files are specified with relative paths, both the current working directory and the directory containing the main config file will be searched for the files.
GLOBAL KEYWORDSWorkDir
WorkDir specifies where the logfiles and the webpages should be created.
Example:
WorkDir: /usr/tardis/pub/GLOBAL KEYWORDSHtmlDir
HtmlDir specifies the directory where the html (or shtml, but we'll get on to those later) lives.
NOTE: Workdir overrides the settings for htmldir, p_w_picpathdir and logdir.
Example:
Htmldir: /specifies the directory where the p_w_picpaths live. They should be under the html directory.
Example:
Imagedir: /specifies the directory where the logs are stored. This need not be under htmldir directive.
Example:
Logdir: /(UNIX only)
With system that supports fork (UNIX for example), mrtg can fork itself into multiple instances while it is acquiring data via snmp.
For situations with high latency or a great number of devices this will speed things up considerably. It will not make things faster, though, if you query a single switch sitting next door.
As far as I know NT can not fork so this option is not available on NT.
Example:
Forks: 4EnableIPv6
When set to yes, IPv6 support is enabled if the required libraries are present (see the the mrtg-ipv6 manpage manpage). When IPv6 is enabled, mrtg can talk to routers using SNMP over IPv6 and targets may be specified by their numeric IPv6 addresses as well as by hostname or IPv4 address.
If IPv6 is enabled and the target is a hostname, mrtg will try to resolve the hostname to an IPv6 address and, if this fails, to an IPv4 address. Note that mrtg will only use IPv4 if you specify an IPv4 address or a hostname with no corresponding IPv6 address; it will not fall back to IPv4 if it simply fails to communicate with the target using IPv6. This is by design.
Note that many routers do not currently support SNMP over IPv6. Use the IPv4Only per target option for these routers.
IPv6 is disabled by default.
Example:
EnableIPv6: YesRefresh
How many seconds apart should the browser (Netscape) be instructed to reload the page? If this is not defined, the default is 300 seconds (5 minutes).
Example:
Refresh: 600Interval
How often do you call mrtg? The default is 5 minutes. If you call it less often, you should specify it here. This does two things:
The generated HTML page contains the right information about the calling interval ... A META header in the generated HTML page will instruct caches about the time-to-live of this page ..... In this example, we tell mrtg that we will be calling it every 10 minutes. If you are calling mrtg every 5 minutes, you can leave this line commented out.
Example:
Interval: 10Note that unless you are using rrdtool you can not set Interval to less than 5 minutes. If you are using rrdtool you can set interval down to 1 minute. Note though, setting the Interval for an rrdtool/mrtg setup will influence the initial creation of the database. If you change the interval later, all existing databases will remain at the resolution they were initially created with.
MaxAge
MRTG relies heavily on the real time clock of your computer. If the time is set to a wrong value, especially if it is advanced far into the future, this will cause mrtg to expire lots of supposedly old data from the log files.
To prevent this, you can add a 'reasonability' check by specifying a maximum age for log files. If a file seems to be older, mrtg will not touch it but complain instead, giving you a chance to investigate the cause.
Example:
MaxAge: 7200The example above will make mrtg refuse to update log files older than 2 hours (7200 seconds).
WriteExpires
With this switch mrtg will generate .meta files for CERN and Apache servers which contain Expiration tags for the html and gif files. The *.meta files will be created in the same directory as the other files, so you will have to set ``MetaDir .'' and ``MetaFiles on'' in your apache.conf or .htaccess file for this to work
System Message: WARNING/2 (
Inline emphasis start-string without end-string.System Message: WARNING/2 (
Inline literal start-string without end-string.System Message: WARNING/2 (
Inline literal start-string without end-string.NOTE: If you are running Apache-1.2 or later, you can use the mod_expire to achieve the same effect ... see the file htaccess.txt
Example:
WriteExpires: YesNoMib2
Normally we ask the SNMP device for 'sysUptime' and 'sysName' properties. Some do not have these. If you want to avoid getting complaints from mrtg about these missing properties, specify the nomib2 option.
An example of agents which do not implement base mib2 attributes are Computer Associates - Unicenter TNG Agents. CA relies on using the base OS SNMP agent in addition to its own agents to supplement the management of a system.
Example:
NoMib2: YesSingleRequest
Some SNMP implementations can not deal with requests asking for multiple snmp variables in one go. Set this in your cfg file to force mrtg to only ask for one variable per request.
Examples
SingleRequest: YesSnmpOptions
Apart from the per target timeout options, you can also configure the behaviour of the snmpget process on a more profound level. SnmpOptions accepts a hash of options. The following options are currently supported:
timeout => $default_timeout, retries => $default_retries, backoff => $default_backoff, default_max_repetitions => $max_repetitions, use_16bit_request_ids => 1, lenient_source_port_matching => 0, lenient_source_address_matching => 1The values behind the options indicate the current default value. Note that these settings OVERRIDE the per target timeout settings.
The 16bit request ids are the only way to query the broken SNMP implementation of SMC Barricade routers.
Example:
SnmpOptions: retries => 2, only_ip_address_matching => 0Note that AS/400 snmp seems to be broken in a way which prevents mrtg from working with it unless
SnmpOptions: lenient_source_port_matching => 1is set.
IconDir
If you want to keep the mrtg icons in someplace other than the working (or p_w_picpathdir) directory, use the IconDir variable for defining the url of the icons directory.
Example:
IconDir: /mrtgicons/LoadMIBs
Load the MIB file(s) specified and make its OIDs available as symbolic names. For better efficiancy, a cache of MIBs is maintained in the WorkDir.
Example:
LoadMIBs: /dept/net/mibs/netapp.mib,/usr/local/lib/ft100m.mibLanguage
Switch output format to the selected Language (Check the translate directory to see which languages are supported at the moment. In this directory you can also find instructions on how to create new translations).
Currently the following laguages are supported:
big5 brazilian bulgarian catalan chinese croatian czech danish dutch eucjp french galician gb gb2312 german greek hungarian icelandic indonesia iso2022jp italian korean lithuanian malay norwegian polish portuguese romanian russian russian1251 serbian slovak slovenian spanish swedish turkish ukrainian
Example:
Language: danishLogFormat
Setting LogFormat to 'rrdtool' in your mrtg.cfg file enables rrdtool mode. In rrdtool mode, mrtg relies on rrdtool to do its logging. See the mrtg-rrd manpage.
Example:
LogFormat: rrdtoolLibAdd
If you are using rrdtool mode and your rrdtool Perl module (RRDs.pm) is not installed in a location where perl can find it on its own, you can use LibAdd to supply an appropriate path.
Example:
LibAdd: /usr/local/rrdtool/lib/perl/PathAdd
If the rrdtool executable can not be found in the normal PATH, you can use this keyword to add a suitable directory to your path.
Example:
PathAdd: /usr/local/rrdtool/bin/RunAsDaemon
The RunAsDaemon keyword enables daemon mode operation. The purpose of daemon mode is that MRTG is launched once and not repeatedly (as it is with cron). This behavior saves computing resourses as loading and parsing of configuration files happens only once.
Using daemon mode MRTG itself is responible for timing the measurement intervals. Therfore its important to set the Interval keyword to an apropiate value.
Note that when using daemon mode MRTG should no longer be started from cron as each new process runs forever. Instead MRTG should be started from the command prompt or by a system startup script.
If you want mrtg to run under a particular user and group (it is not recomended to run MRTG as root) then you can use the --user=user_name and --group=group_name options on the mrtg commandline.
mrtg --user=mrtg_user --group=mrtg_group mrtg.cfgAlso note that in daemon mode restarting the process is required in order to activate changes in the config file.
Under UNIX, the Daemon switch causes mrtg to fork into background after checking its config file. On Windows NT the MRTG process will detach from the console, but because the NT/2000 shell waits for its children you have to use this special start sequence when you launch the program:
start /b perl mrtg mrtg.cfgYou may have to add path information equal to what you add when you run mrtg from the commandline.
Example
RunAsDaemon: Yes Interval: 5This makes MRTG run as a daemon beginning data collection every 5 minutes
If you are daemontools and still want to run mrtg as a daemon you can additionally specify
NoDetach: Yesthis will make mrtg run but without detaching it from the terminal.
ConversionCode
Some devices may produce non-numeric values that would nevertheless be useful to graph with MRTG if those values could be converted to numbers. The ConversionCode keyword specifies the path to a file containing Perl code to perform such conversions. The code in this file must consist of one or more Perl subroutines. Each subroutine must accept a single string argument and return a single numeric value. When RRDtool is in use, a decimal value may be returned. When the name of one of these subroutines is specified in a target definition (see below), MRTG calls it twice for that target, once to convert the the input value being monitored and a second time to convert the output value. The subroutine must return an undefined value if the conversion fails. In case of failure, a warning may be posted to the MRTG log file using Perl's warn function. MRTG imports the subroutines into a separate name space (package MRTGConversion), so the user need not worry about pollution of MRTG's global name space. MRTG automatically prepends this package declaration to the user-supplied code.
Example: Suppose a particular OID returns a character string whose length is proportional to the value to be monitored. To convert this string to a number that can be graphed by MRTG, create a file arbitrarily named ``MyConversions.pl'' containing the following code:
System Message: WARNING/2 (
Inline literal start-string without end-string.# Return the length of the string argument sub Length2Int {
System Message: ERROR/3 (
Unexpected indentation.my $value = shift; return length( $value );System Message: WARNING/2 (
Block quote ends without a blank line; unexpected unindent.System Message: INFO/1 (
Unexpected possible title overline or transition. Treating it as ordinary text because it's so short.}
Then include the following global keyword in the MRTG configuration file (assuming that the conversion code file is saved in the mrtg/bin directory along with mrtg itself):
ConversionCode: MyConversions.plThis will cause MRTG to include the definition of the subroutine Length2Int in its execution environment. Length2Int can then be invoked on any target by appending ``|Length2Int'' to the target definition as follows:
System Message: WARNING/2 (
Inline literal start-string without end-string.System Message: WARNING/2 (
Inline substitution_reference start-string without end-string.Target[myrouter]: 1.3.6.1.4.1.999.1&1.3.6.1.4.1.999.1:public@mydevice|Length2IntSee ``Extended Host Name Syntax'' below for complete target definition syntax information.
System Message: WARNING/2 (
Inline literal start-string without end-string.
PER TARGET CONFIGURATION
Each monitoring target must be identified by a unique name. This name must be appended to each parameter belonging to the same target. The name will also be used for naming the generated webpages, logfiles and p_w_picpaths for this target.
Target
With the Target keyword you tell mrtg what it should monitor. The Target keyword takes arguments in a wide range of formats:
Basic The most basic format is ``port:community@router'' This will generate a traffic graph for the interface 'port' of the host 'router' (dns name or IP address) and it will use the community 'community' (snmp password) for the snmp query.
System Message: WARNING/2 (
Inline literal start-string without end-string.Example:
Target[myrouter]: 2:public@wellfleet-fddi.ethz.ch
If your community contains a ``@'' or a `` '' these characters must be escaped with a ``''.
System Message: WARNING/2 (
Inline literal start-string without end-string.System Message: WARNING/2 (
Inline literal start-string without end-string.Target[bla]: 2:stupi@d@router
SNMPv2c If you have a fast router you might want to try to poll the ifHC* counters. This feature gets activated by switching to SNMPv2c. Unfortunately not all devices support SNMPv2c yet. If it works, this will prevent your counters from wraping within the 5 minute polling interval, since we now use 64 bit instead of the normal 32 bit.
Example:
Target[myrouter]: 2:public@router1:::::2
Reversing Sometimes you are sitting on the wrong side of the link, and you would like to have mrtg report Incoming traffic as Outgoing and vice versa. This can be achieved by adding the '-' sign in front of the ``Target'' description. It flips the incoming and outgoing traffic rates.
System Message: WARNING/2 (
Inline literal start-string without end-string.Example:
Target[ezci]: -1:public@ezci-ether.ethz.ch
Explicit OIDs You can also explicitly define which OID to query by using the following syntax 'OID_1&OID_2:community@router' The following example will retrieve error counts for input and output on interface 1. MRTG needs to graph two variables, so you need to specify two OID's such as temperature and humidity or error input and error output.
Example:
Target[myrouter]: 1.3.6.1.2.1.2.2.1.14.1&1.3.6.1.2.1.2.2.1.20.1:public@myrouter
MIB Variables MRTG knows a number of symbolic SNMP variable names. See the file mibhelp.txt for a list of known names. One example are the ifInErrors and ifOutErrors. This means you can specify the above as:
Example:
Target[myrouter]: ifInErrors.1&ifOutErrors.1:public@myrouter
Interface by IP Sometimes SNMP interface index can change, like when new interfaces are added or removed. This can cause all Target entries in your config file to become offset, causing MRTG to graphs wrong instances etc. MRTG supports IP address instead of ifindex in target definition. Then MRTG will query snmp device and try to map IP address to the current ifindex. You can use IP addresses in every type of target definition by adding IP address of the numbered interface after OID and separation char '/'.
Make sure that the given IP address is used on your same target router, especially when graphing two different OIDs and/or interface split by '&' delimiter.
You can tell cfgmaker to generate such references with the option --ifref=ip.
Example:
Target[myrouter]: /1.2.3.4:public@wellfleet-fddi.ethz.ch Target[ezci]: -/1.2.3.4:public@ezci-ether.ethz.ch Target[myrouter]: 1.3.6.1.2.1.2.2.1.14/1.2.3.4&1.3.6.1.2.1.2.2.1.14/1.2.3.4:public@myrouter Target[myrouter]: ifInErrors/1.2.3.4&ifOutErrors/1.2.3.4:public@myrouter
Interface by Description If you can not use IP addresses you might want to use the interface names. This works similar to the IP address aproach except that the prefix to use is a instead of a /
You can tell cfgmaker to generate such references with the option --ifref=descr.
Example:
Target[myrouter]: My-Interface2:public@wellfleet-fddi.ethz.ch Target[ezci]: -My-Interface2:public@ezci-ether.ethz.ch Target[myrouter]: 1.3.6.1.2.1.2.2.1.14My-Interface2&1.3.6.1.2.1.2.2.1.14My-Interface3:public@myrouter Target[myrouter]: ifInErrorsMy-Interface2&ifOutErrorsMy-Interface3:public@myrouter
If your description contains a ``&'', a ``:'', a ``@'' or a `` '' you can include them but you must escape with a backlash:
System Message: WARNING/2 (
Inline literal start-string without end-string.System Message: WARNING/2 (
Inline literal start-string without end-string.System Message: WARNING/2 (
Inline literal start-string without end-string.Target[myrouter]: fun:ney&ddd:public@hello.router
Interface by Name This is the only sensible way to reference the interfaces of your switches.
You can tell cfgmaker to generate such references with the option --ifref=name.
Example:
Target[myrouter]: #2/11:public@wellfleet-fddi.ethz.ch Target[ezci]: -#2/11:public@ezci-ether.ethz.ch Target[myrouter]: 1.3.6.1.2.1.2.2.1.14#3/7&1.3.6.1.2.1.2.2.1.14#3/7:public@myrouter Target[myrouter]: ifInErrors#3/7&ifOutErrors#3/7:public@myrouter
If your description contains a ``&'', a ``:'', a ``@'' or a `` '' you can include them but you must escape with a backlash:
System Message: WARNING/2 (
Inline literal start-string without end-string.System Message: WARNING/2 (
Inline literal start-string without end-string.System Message: WARNING/2 (
Inline literal start-string without end-string.Target[myrouter]: #:fun:public@hello.router
System Message: WARNING/2 (
Inline emphasis start-string without end-string.You can use the Physical Address in every type of target definition by adding the Physical Address after the OID and the separation char '!' (analogous to the IP address option). The Physical address is specified as '-' delimited octets, such as ``0a-0-f1-5-23-18'' (omit the double quotes). Note that some routers use the same Hardware Ethernet Address for all of their Interfaces which prevents unique interface identification. Mrtg will notice such problems and alert you.
System Message: WARNING/2 (
Inline literal start-string without end-string.You can tell cfgmaker to generate configuration files with hardware ethernet address references by using the option --ifref=eth.
Example:
Target[myrouter]: !0a-0b-0c-0d:public@wellfleet-fddi.ethz.ch Target[ezci]: -!0-f-bb-05-71-22:public@ezci-ether.ethz.ch Target[myrouter]: 1.3.6.1.2.1.2.2.1.14!0a-00-10-23-44-51&!0a-00-10-23-44-51:public@myrouter Target[myrouter]: ifInErrors!0a-00-10-23-44-51&ifOutErrors!0a-00-10-23-44-51:public@myrouter
Interface by Type It seems that there are devices that try to defy all monitoring efforts: the interesting interfaces have neither ifName nor a constant ifDescr not to mention a persistant ifIndex. The only way to get a constant mapping is by looking at the interface type, because the interface you are interested in is unique in the device you are looking at ...
You can tell cfgmaker to generate such references with the option --ifref=type.
Example:
Target[myrouter]: %13:public@wellfleet-fddi.ethz.ch Target[ezci]: -%13:public@ezci-ether.ethz.ch Target[myrouter]: 1.3.6.1.2.1.2.2.1.14%13&1.3.6.1.2.1.2.2.1.14%14:public@myrouter Target[myrouter]: ifInErrors%13&ifOutErrors%14:public@myrouter
Extended Host Name Syntax In all places where ``community@router'' is accepted, you can add additional parameters for the SNMP communication using colon-separated suffixes. You can also append a pipe symbol ( | ) and the name of a numeric conversion subroutine as described under the global keyword ``ConversionCode'' above. The full syntax is as follows:
System Message: WARNING/2 (
Inline literal start-string without end-string.System Message: WARNING/2 (
Inline literal start-string without end-string.community@router[:[port][:[timeout][:[retries][:[backoff][:[version]][|name]]]]]
System Message: WARNING/2 (
Inline substitution_reference start-string without end-string.where the meaning of each parameter is as follows:port the UDP port under which to contact the SNMP agent (default: 161) timeout initial timeout for SNMP queries, in seconds (default: 2.0) retries number of times a timed-out request will be retried (default: 5) backoff factor by which the timeout is multiplied on every retry (default: 1.0). version for SNMP version. If you have a fast router you might want to put a '2' here. This will make mrtg try to poll the 64 bit counters and thus prevent excessive counter wrapping. Not all routers support this though.
Example:
3:public@router1:::::2
name the name of the subroutine that MRTG will call to convert the input and output values to integers. See the complete example under the global keyword ``ConversionCode'' above.
System Message: WARNING/2 (
Inline literal start-string without end-string.Example:
1.3.6.1.4.1.999.1&1.3.6.1.4.1.999.2:public@mydevice:161::::2|Length2Int
This would retrieve values from the OID 1.3.6.1.4.1.999.1 for input and .2 for output on mydevice using UDP port 161 and SNMP version 2, and would execute the user-defined numeric conversion subroutine Length2Int to convert those values to integers.A value that equals the default value can be omitted. Trailing colons can be omitted, too. The pipe symbol followed by the name parameter, if present, must come at the end. There must be no spaces around the colons or pipe symbol.
Example:
Target[ezci]: 1:public@ezci-ether.ethz.ch:9161::4This would refer to the input/output octet counters for the interface with ifIndex 1 on ezci-ether.ethz.ch, as known by the SNMP agent listening on UDP port 9161. The standard initial timeout (2.0 seconds) is used, but the number of retries is set to four. The backoff value is the default. Numeric IPv6 addresses
System Message: ERROR/3 (
Unexpected indentation.If IPv6 is enabled you may also specify a target using its IPv6 address. To avoid ambiguity with the port number, numeric IPv6 addresses must be placed in square brackets.
Example:
Target[IPv6test]: 2:public@[2001:760:4::]:6161::4
External Monitoring Scripts If you want to monitor something which does not provide data via snmp you can use some external program to do the data gathering.
The external command must return 4 lines of output:
Line 1 current state of the first variable, normally 'incoming bytes count' Line 2 current state of the second variable, normally 'outgoing bytes count' Line 3 string (in any human readable format), telling the uptime of the target. Line 4 string, telling the name of the target. Depending on the type of data your script returns you might want to use the 'gauge' or 'absolute' arguments for the Options keyword.
Example:
Target[myrouter]: /usr/local/bin/df2mrtg /dev/dsk/c0t2d0s0Note the use of the backticks (`), not apostrophes (') around the command.
If you want to use a backtick in the command name this can be done but you must escape it with a backslash ...
If your script does not have any data to return but does not want mrtg to complain about invalid data, it can return 'UNKNOWN' instead of a number. Note though that only rrdtool is realy equipped to handle unknown data well. Multi Target Syntax
System Message: ERROR/3 (
Unexpected indentation.You can also combine several target definitions in a mathematical e¬xpression. Any syntactically correct e¬xpression that the Perl interpreter can evaluate to will work. An e¬xpression could be used, for example, to aggregate both B channels in an ISDN connection or to calculate the percentage hard disk utilization of a server from the absolute used space and total capacity.
Examples:
Target[myrouter]: 2:public@wellfleetA + 1:public@wellfleetA
Target[myrouter]: 1.3.6.1.4.1.999.1&1.3.6.1.4.1.999.2:public@mydevice / 1.3.6.1.4.1.999.3&1.3.6.1.4.1.999.4:public@mydevice * 100Note that whitespace must surround each target definition in the e¬xpression. Target definitions themselves must not contain whitespace, except in interface descriptions and interface names, where each whitespace character is escaped by a backslash.
MRTG automatically rounds the result of the e¬xpression to an integer unless RRDTool logging is in use and the gauge option is in effect for the target. Internally MRTG uses Perl's Math::BigFloat package to calculate the result of the e¬xpression with 40 digits of precision. Even in extreme cases, where, for example, you take the difference of two 64-bit integers, the result of the e¬xpression should be accurate.
SNMP Request Optimization MRTG is designed to economize on its SNMP requests. Where a target definition appears more than once in the configuration file, MRTG requests the data from the device only once per round of data collection and uses the collected data for each instance of a particular target. Recognition of two target definitions as being identical is based on a simple string match rather than any kind of deeper semantic analysis.
Example:
Target[Targ1]: 1:public@CiscoA Target[Targ2]: 2:public@CiscoA Target[Targ3]: 1:public@CiscoA + 2:public@CiscoA Target[Targ4]: 1:public@CISCOA
This results in a total of three SNMP requests. Data for 1:public@CiscoA and 2:public@CiscoA are requested only once each, and used for Targ1, Targ2, and Targ3. Targ4 causes another SNMP request for 1:public@CISCOA, which is not recognized as being identical to 1:public@CiscoA.MaxBytes
The maximum value either of the two variables monitored are allowed to reach. For monitoring router traffic this is normally the bytes per second this interface port can carry.
If a number higher than MaxBytes is returned, it is ignored. Also read the section on AbsMax for further info. The MaxBytes value is also used in calculating the Y range for unscaled graphs (see the section on Unscaled).
Since most links are rated in bits per second, you need to divide their maximum bandwidth (in bits) by eight (8) in order to get bytes per second. This is very important to make your unscaled graphs display realistic information. T1 = 193000, 56K = 7000, 10 MB Ethernet = 1250000, 100 MB Ethernet = 12500000. The MaxBytes value will be used by mrtg to decide whether it got a valid response from the router.
If you need two different MaxBytes values for the two monitored variables, you can use MaxBytes1 and MaxBytes2 instead of MaxBytes.
Example:
MaxBytes[myrouter]: 1250000Title
Title for the HTML page which gets generated for the graph.
Example:
Title[myrouter]: Traffic Analysis for Our Nice Company
OPTIONAL PER TARGET KEYWORDS
PageTop
Things to add to the top of the generated HTML page. Note that you can have several lines of text as long as the first column is empty.
Note that the continuation lines will all end up on the same line in the html page. If you want linebreaks in the generated html use the 'n' sequence.
Example:
PageTop[myrouter]:
Traffic Analysis for ETZ C95.1
Our Campus Backbone runs over an FDDI linen with a maximum transfer rate of 12.5 megabytes per Second. RouterUptimeIn cases where you calculate the used bandwidth from several interfaces you normaly don't get the router uptime and router name displayed on the web page.
If these interfaces are on the same router and the uptime and name should be displayed you have to specify its community and address again with the RouterUptime keyword.
Example:
Target[kacisco.comp.edu]: 1:public@194.64.66.250 + 2:public@194.64.66.250 RouterUptime[kacisco.comp.edu]: public@194.64.66.250RouterName
If the default name of the router is incorrect/uninformative, you can use RouterName to specify a different OID on either the same or a different host.
A practical example: sysName on BayTech DS72 units always display ``ds72'', no matter what you set the Unit ID to be. Instead, the Unit ID is stored at 1.3.6.1.4.1.4779.1.1.3.0, so we can have MRTG display this instead of sysName.
System Message: WARNING/2 (
Inline literal start-string without end-string.Example:
RouterName[kacisco.comp.edu]: 1.3.6.1.4.1.4779.1.1.3.0A different OID on a different host can also be specified:
RouterName[kacisco.comp.edu]: 1.3.6.1.4.1.4779.1.1.3.0:public@194.64.66.251MaxBytes1
Same as MaxBytes, for variable 1.
MaxBytes2
Same as MaxBytes, for variable 2.
IPv4Only
Many IPv6 routers do not currently support SNMP over IPv6 and must be monitored using IPv4. The IPv4Only option forces mrtg to use IPv4 when communicating with the target, even if IPv6 is enabled. This is useful if the target is a hostname with both IPv4 and IPv6 addresses; without the IPv4Only keyword, monitoring such a router will not work if IPv6 is enabled.
If set to no (the default), mrtg will use IPv6 unless the target has no IPv6 addresses, in which case it will use IPv4. If set to yes, mrtg will only use IPv4.
Note that if this option is set to yes and the target does not have an IPv4 address, communication with the target will fail.
This option has no effect if IPv6 is not enabled.
Example:
Target[v4onlyrouter_1]: 1:public@v4onlyrouter IPv4Only[v4onlyrouter_1]: YesPageFoot
Things to add to the bottom of the generated HTML page. Note that you can have several lines of text as long as the first column is empty.
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