Cisco WAN :: 1841 - SNMP OID For Interface Utilization

Jan 13, 2013

I have a cisco 1841, Im trying to write an app which will get the Interface Utilization on my 2 atm interfaces and fast eth 0/0 interface.
I’ve been reading up and have got as far as downloading the codeplex snmp library project. I’m using the snmpget app to get details off my 1841 successfully, but I now need to know the OID for interface utilization and how to define which interface to get.

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In DFM device detail the interfaces are being managed.
In the Link Utilization Poller, only 1 interface is listed (FA 1/7).

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For eg its displayed % (Rx Max%,Rx Avg%,RxMin%,
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I am getting these unwanted entries on my syslog server.03/10/2012 12:57:48 Error 23898: Interface FastEthernet0/1, changed state to downI tried to stop them with no snmp trap link-status but it hasn;t worked.[CODE]

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i noticed the "output drops" increasing in  interface gi 1/0/1 in my switch 2960-S although the utilization of my interface is between 20% and 50 %
SW__A#sh interfaces gigabitEthernet 1/0/1
GigabitEthernet1/0/1 is up, line protocol is up (connected)
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what is the cause of this issue ?

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I am attempting to monitor bandwidth utilization of the WAN port for the RV180 via SNMP and I am getting strange results.  If a 256MB file is transferred from a remote server (without compression), the ifInOctets counter doesn't increment by anything resembling 256MB:
$ snmpget -v2c -c  public IF-MIB::ifInOctets.5  IF-MIB::ifOutOctets.5
IF-MIB::ifInOctets.5 = Counter32: 365402138
IF-MIB::ifOutOctets.5 = Counter32: 32610053


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The router has the latest firmware available (  There is only one network connection and the RV180 is the default gateway for all internal hosts.

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I use an 1841 router as an internet facing firewall with a 10MB MetroE connection.  Lately users started reporting slow internet download speeds and web pages timing out.  Bandwidth reports do not show the link as being saturated so I looked at the interfaces on the 1841.   The interface connected to the provider shows OK as far as errors but the LAN side of the router shows steadily increasing input errors.  It doesn't show any other errors, no CRC, frame, runts, giants or overruns, just generic input errors.  What type of errors are those?  Nothing is being logged on the console.
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I'm trying to troubleshoot one of our site today and can't seem to issue the show dsl interface command on a 1841 router. Does the same command is used for SHDSL or am I running with an IOS bug?
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% Unrecognized command
#sh ver
Cisco IOS Software, 1841 Software (C1841-BROADBAND-M), Version 12.4(15)T7, RELEASE SOFTWARE (fc3)
Technical Support: {URL}
Compiled Wed 13-Aug-08 15:42 by prod_rel_team
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NAME: "chassis", DESCR: "1841 chassis"
PID: CISCO1841         , VID: V05 , SN: FHK13212639
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I have an 1841 between my firewall and the ISP.  Three interfaces - multilink to ISP, FA to my firewall, and FA to my inside network.  I use the inside interface for configs aand snmp access, etc.   Only my ISP-assigned fixed address block will get routed to the multilink by the ISP but I am nervous about the inside interface sitting on my LAN.   I know I can remove it, but if I keep it there, how can I set up an ACL so that all traffic from the multilink interface is denied to the inside interface?  I suppose another way to think about it that the inbound iface can only accept traffic from its own outside, not from the router.I think this is fairly simple but I don't want to knock down the traffic if I get it wrong.

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we've to configure our router 1841 to use both 2 interface Fe for two different vlan (also the second has to go on internet).

Actually we have int Fe0/0 configured with an ip address for lan1 and we will use the second int Fe0/1 with another ip address like for lan2

see below configuration:


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Here is an output of show dsl int, would change the firmware, it has been fine all this time before though we are running IOS 12.4(24)T1 advseck9-m, as far as I can seen from our ISP the config for ADSL is all correct. [Code]

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