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Full Discussion: using if to identify proper mib for use with a cisco switch
Top Forums Shell Programming and Scripting using if to identify proper mib for use with a cisco switch Post 302262496 by mitch on Thursday 27th of November 2008 02:48:30 PM
Old 11-27-2008
using if to identify proper mib for use with a cisco switch
Happy ThanksGiving guys,

I'm working on a script that will use nmap to enumerate a network for active cisco switches. Once the list is complete, we use sed to clean up the file (called nmapres) so it is only a list of IP addresses. Next I want to use a while statement to go down that list of IPs and snmpwalk each switch to retreive that switches serial number and record it to a mysql db. The intent is to have a click option on a web site that will php shellexec this script and print out a list of active serial numbers on a network. Here is what I have so far and it is taking place on Fedora 9...

#!/bin/bash

/bin/touch error
/bin/touch log

# obtain a list of active devices
nmap -sP 10.0.0.0/24 > nmapres

# Clean nmapres up to just a list of IPs
sed -i 's/Starting.*//g' nmapres
sed -i 's/Host //g' nmapres
sed -i 's/ appears.*//g' nmapres
sed -i 's/Nmap.*//g' nmapres
sed -i /^$/d nmapres

# Identify some variables
line=1

num= 'wc -l < nmapres'

3550mib=mib-2.47.1.1.1.1.11.1

3560mib=mib-2.47.1.1.1.1.11.1001

# the real work
while [ "$line" -le "$num" ]
do
# Extract line x from file of ip addresses
ip=`sed -n "$line"p nmapres`

if

fi


# Used to increment loop variable
line=`expr "$line" + 1`
done


Between the if and fi I would like to snmpwalk each IP address and check if the switch prefers 3550mib or 3560mib. I know that if I snmpwalk a switch and it doesn't like the mib I query for I get this (SNMPv2-SMI::mib-2.47.1.1.1.1.11.1 = No Such Instance currently exists at this OID) but if the switch does like the requested mib the output is (SNMPv2-SMI::mib-2.47.1.1.1.1.11.1001 = STRING: "serial number"). Do you guys know how I could do this?

Thanks.
 

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LEARN ABOUT REDHAT

snmptranslate

SNMPTRANSLATE(1)						     Net-SNMP							  SNMPTRANSLATE(1)

NAME

       snmptranslate - translate SNMP OID values into more useful information

SYNOPSIS

       snmptranslate [OPTIONS] OID [OID]...

DESCRIPTION

       snmptranslate  is  an  application that translates one or more SNMP object identifier values from their symbolic (textual) forms into their
       numerical forms (or vice versa).  With no options, an SNMP OID value will be translated from its symbolic form to its numerical form.

OPTIONS

       -D TOKEN[,...]
	       Turn on debugging output for the given TOKEN(s).  Try ALL for extremely verbose output.

       -h      Display a brief usage message and then exit.

       -m MIBLIST
	       Specifies a colon separated list of MIB modules to load for this application.  This overrides the environment variable MIBS.

	       The special keyword ALL is used to specify all modules in all directories when searching for MIB files.	Every file whose name does
	       not begin with "." will be parsed as if it were a MIB file.

       -M DIRLIST
	       Specifies a colon separated list of directories to search for MIBs.  This overrides the environment variable MIBDIRS.

       -T TRANSOPTS
	       Provides control over the translation of the OID values.  The following TRANSOPTS are available:

	       -Td   Print full details of the specified OID.

	       -Tp   Print a graphical tree, rooted at the specified OID.

	       -Ta   Dump the loaded MIB in a trivial form.

	       -Tl   Dump a labeled form of all objects.

	       -To   Dump a numeric form of all objects.

	       -Ts   Dump a symbolic form of all objects.

	       -Tt   Dump a tree form of the loaded MIBs (mostly useful for debugging).

       -V      Display version information for the application and then exit.

       -w WIDTH
	       Specifies the width of -Tp and -Td output. The default is very large.

       In  addition  to  the  above options, snmptranslate takes the OID input (-I), MIB parsing (-M) and OID output (-O) options described in the
       INPUT OPTIONS, MIB PARSING OPTIONS and OUTPUT OPTIONS sections of the snmpcmd(1) manual page.

EXAMPLES

       o   snmptranslate -On -IR sysDescr
	   will translate "sysDescr" to a more qualified form:

	   system.sysDescr

       o   snmptranslate -Onf -IR sysDescr
	   will translate "sysDecr" to:

	   .iso.org.dod.internet.mgmt.mib-2.system.sysDescr

       o   snmptranslate -Td -OS system.sysDescr
	   will translate "sysDecr" into:

	   SNMPv2-MIB::sysDescr
	   sysDescr OBJECT-TYPE
	     -- FROM SNMPv2-MIB
	     -- TEXTUAL CONVENTION DisplayString
	     SYNTAX OCTET STRING (0..255)
	     DISPLAY-HINT "255a"
	     MAX-ACCESS read-only
	     STATUS current
	     DESCRIPTION "A textual description of the entity. This
			  value should include the full name and
			  version identification of the system's
			  hardware type, software operating-system,
			  and networking software."
	   ::= { iso(1) org(3) dod(6) internet(1) mgmt(2) mib-2(1) system(1) 1 }

       o   snmptranslate -Tp -OS system
	   will print the following tree:

	   +--system(1)
	      |
	      +-- -R-- String	 sysDescr(1)
	      |        Textual Convention: DisplayString
	      |        Size: 0..255
	      +-- -R-- ObjID	 sysObjectID(2)
	      +-- -R-- TimeTicks sysUpTime(3)
	      +-- -RW- String	 sysContact(4)
	      |        Textual Convention: DisplayString
	      |        Size: 0..255
	      +-- -RW- String	 sysName(5)
	      |        Textual Convention: DisplayString
	      |        Size: 0..255
	      +-- -RW- String	 sysLocation(6)
	      |        Textual Convention: DisplayString
	      |        Size: 0..255
	      +-- -R-- Integer	 sysServices(7)
	      +-- -R-- TimeTicks sysORLastChange(8)
	      |        Textual Convention: TimeStamp
	      |
	      +--sysORTable(9)
		 |
		 +--sysOREntry(1)
		    |
		    +-- ---- Integer   sysORIndex(1)
		    +-- -R-- ObjID     sysORID(2)
		    +-- -R-- String    sysORDescr(3)
		    |	     Textual Convention: DisplayString
		    |	     Size: 0..255
		    +-- -R-- TimeTicks sysORUpTime(4)
			     Textual Convention: TimeStamp

       o   snmptranslate -Ta | head
	   will produce the following dump:

	   dump DEFINITIONS ::= BEGIN
	   org ::= { iso 3 }
	   dod ::= { org 6 }
	   internet ::= { dod 1 }
	   directory ::= { internet 1 }
	   mgmt ::= { internet 2 }
	   experimental ::= { internet 3 }
	   private ::= { internet 4 }
	   security ::= { internet 5 }
	   snmpV2 ::= { internet 6 }

       o   snmptranslate -Tl | head
	   will produce the following dump:

	   .iso(1).org(3)
	   .iso(1).org(3).dod(6)
	   .iso(1).org(3).dod(6).internet(1)
	   .iso(1).org(3).dod(6).internet(1).directory(1)
	   .iso(1).org(3).dod(6).internet(1).mgmt(2)
	   .iso(1).org(3).dod(6).internet(1).mgmt(2).mib-2(1)
	   .iso(1).org(3).dod(6).internet(1).mgmt(2).mib-2(1).system(1)
	   .iso(1).org(3).dod(6).internet(1).mgmt(2).mib-2(1).system(1).sysDescr(1)
	   .iso(1).org(3).dod(6).internet(1).mgmt(2).mib-2(1).system(1).sysObjectID(2)
	   .iso(1).org(3).dod(6).internet(1).mgmt(2).mib-2(1).system(1).sysUpTime(3)

       o   snmptranslate -To | head
	   will produce the following dump

	   .1.3
	   .1.3.6
	   .1.3.6.1
	   .1.3.6.1.1
	   .1.3.6.1.2
	   .1.3.6.1.2.1
	   .1.3.6.1.2.1.1
	   .1.3.6.1.2.1.1.1
	   .1.3.6.1.2.1.1.2
	   .1.3.6.1.2.1.1.3

       o   snmptranslate -Ts | head
	   will produce the following dump

	   .iso.org
	   .iso.org.dod
	   .iso.org.dod.internet
	   .iso.org.dod.internet.directory
	   .iso.org.dod.internet.mgmt
	   .iso.org.dod.internet.mgmt.mib-2
	   .iso.org.dod.internet.mgmt.mib-2.system
	   .iso.org.dod.internet.mgmt.mib-2.system.sysDescr
	   .iso.org.dod.internet.mgmt.mib-2.system.sysObjectID
	   .iso.org.dod.internet.mgmt.mib-2.system.sysUpTime

       o   snmptranslate -Tt | head
	   will produce the following dump

	     org(3) type=0
	       dod(6) type=0
		 internet(1) type=0
		   directory(1) type=0
		   mgmt(2) type=0
		     mib-2(1) type=0
		       system(1) type=0
			 sysDescr(1) type=2 tc=4 hint=255a
			 sysObjectID(2) type=1
			 sysUpTime(3) type=8

SEE ALSO

       snmpcmd(1), variables(5), RFC 2578-2580.

4th Berkeley Distribution					    08 Feb 2002 						  SNMPTRANSLATE(1)
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