[mrtg] Re: SNMP and Cisco ... Oh the Fun a newbie can have.

Moses Hernandez moses_hernandez at hotmail.com
Tue Aug 31 21:24:38 MEST 2004 

RE: [mrtg] Re: SNMP and Cisco ... Oh the Fun a newbie can have.I understand your thinking on this, but even though we are using MLS I should see more activity between those ports just because we are transferring pacs images that can be 50-100MB per case. So I would've imagined that we are using more of the bandwidth than we are possibly seeing. I am going to try and approach this differently, instead of monitoring the CoreSwitches i am going to monitor the IDF's.

Moses.

  ----- Original Message ----- 
  From: Grossman, Benjamin 
  To: 'Moses Hernandez' 
  Cc: Eric_Mailing_List at rednarb.com ; mrtg at list.ee.ethz.ch 
  Sent: Tuesday, August 31, 2004 2:39 PM
  Subject: RE: [mrtg] Re: SNMP and Cisco ... Oh the Fun a newbie can have.


  This is (all to often) the normal case for a Cisco 6500 switch/router. 

  The issue is that, in the most common case, the 6500 is only routing the first few packets of a given 'conversation'; after that they are switched. So the traffic counters for the Virtual router Interface are pretty much useless. 

  The only ways I know around this are to either install some fancy hardware (Multi-Flow Feature Card?) and matching software; or to disable that part of the 'switching' function. I seem to recall having some luck with disabling CEF on that router port---WARNING: this will have a severe negative impact on router performance! Do not do this lightly.

  -Benjamin 




  -----Original Message----- 
  From: Moses Hernandez [mailto:moses_hernandez at hotmail.com] 
  Sent: Tuesday, August 31, 2004 9:00 AM 
  To: Eric_Mailing_List at rednarb.com; mrtg at list.ee.ethz.ch 
  Subject: [mrtg] Re: SNMP and Cisco ... Oh the Fun a newbie can have. 



  Hmm actually let me do that. Here is what i have right now on one of my 
  interfaces: 

  ### Interface 107 >> Descr: 'DataCenter 2MDF-SW1' | Name: '3/1' | Ip: '' | 
  Eth: '00-0d-28-3f-8b-b8' ### 
  ### The following interface is commented out because: 
  Target[10.4.0.4_107]: 107:c1sc0 at 10.4.0.4:161::::2 
  SetEnv[10.4.0.4_107]: MRTG_INT_IP="" MRTG_INT_DESCR="DataCenter 2MDF-SW1" 
  MaxBytes[10.4.0.4_107]: 1000000000 
  Title[10.4.0.4_107]:  DataCenter 2MDF-SW1  -- MIA_6K_MDF1 
  PageTop[10.4.0.4_107]: <H1> DataCenter 2MDF-SW1  -- MIA_6K_MDF1</H1> 
  Options[10.4.0.4_107]: bits, unknaszero 
  YLegend[10.4.0.4_107]: Port Utilization 
  LegendI[10.4.0.4_107]: In 
  LegendO[10.4.0.4_107]: Out 
  Legend1[10.4.0.4_107]: Inbound Bits 
  Legend2[10.4.0.4_107]: Outbound Bits 
  Legend3[10.4.0.4_107]: INBOUND Max value per interval on graph 
  Legend4[10.4.0.4_107]: OUTBOUND Max value per interval on graph 
  Colours[10.4.0.4_107]: GREEN#00eb0c,BLUE#0000ff,GRAY#AAAAAA,VIOLET#ff00ff 
  WithPeak[10.4.0.4_107]: ymw 
  <TABLE> 
     <TR><TD>System:</TD>     <TD>MIA_6K_MDF1 in Mercy MDF</TD></TR> 
     <TR><TD>Maintainer:</TD> <TD></TD></TR> 
     <TR><TD>Description:</TD><TD>  </TD></TR> 
     <TR><TD>ifType:</TD>     <TD>ethernetCsmacd (6)</TD></TR> 
     <TR><TD>ifName:</TD>     <TD>3/1</TD></TR> 
     <TR><TD>Port Name:</TD>  <TD>DataCenter 2MDF-SW1</TD></TR> 
     <TR><TaD>Max Speed:</TD>  <TD>1000.0 MBytes/s</TD></TR> </TABLE> 

  Interestingly enough when i do a show port 3/1 (this is the CatIOS Side, 
  Hybrid Mode) i do not see any counters that would reflect that. show 
  spantree 3/1 shows forwarding in all of the vlans but the graph at the 
  momment display about 

  Max In  8753.5 kb/s (0.1%)   Average In  3592.3 kb/s (0.0%)   Current In  
  4237.3 kb/s (0.1%) 
  Max Out  1520.6 kb/s (0.0%)   Average Out  1205.6 kb/s (0.0%)   Current Out  
  1207.2 kb/s (0.0%) 



  is that correct? I mean seems awfully low so what i did was telneted to the 
  other side and looked at the gigabit uplink. This is what i see for 5 
  minutes 

  5 minute input rate 1238000 bits/sec, 933 packets/sec 
    5 minute output rate 3966000 bits/sec, 978 packets/sec 

  Is there something i am missing maybe? or are these numbers accurate and 
  that switch has little to no traffic maybe? 

  Mind you the biggest traffic generation is between the 2 cores and i've seen 
  the max 50MB/s with the links being Gigabit. 



  >From: Eric Brander <Eric_Mailing_List at rednarb.com> 
  >To: mrtg at list.ee.ethz.ch 
  >Subject: [mrtg] Re: SNMP and Cisco ... Oh the Fun a newbie can have. 
  >Date: Tue, 31 Aug 2004 10:06:06 -0500 
  >MIME-Version: 1.0 
  >Moses Hernandez wrote: 
  > 
  > > I have started using mrtg on a win32 test box. It has been running 
  > > for 5 days on the core router 6500 router side, two remote connect 
  > > routers and 
  >the 
  > > internet firewall. Today I configured the 6500 gigabit switchports 
  > > to 
  >also 
  > > get snmp info. I have noticed not much traffic above the 640.0 K 
  > > usage, maybe 1.2M. I am using mrtg 2.10.15 and I thought it was a 
  > > versioning 
  >issue 
  > > but noticed some others in the archive had similar issues though no 
  > > resolution. As an aside the low numbers are showing up on my nokia 
  >firewalls 
  > > and the numbers are kind of inconsistance with the bandwidth stats 
  > > from 
  >my 
  > > isp. 



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