11 Replies Latest reply on Apr 8, 2016 3:19 PM by ice

Possible to set default tunnel bandwidth?

sotherls Feb 26, 2015 11:57 AM

I have been trying to see if there is a way to set the default tunnel bandwidth to something other than 0.1. Most of ours need be set to 100 instead of .1 and until set throw our numbers out of whack.

Is this possible??

Re: Possible to set default tunnel bandwidth?

ice Feb 26, 2015 5:24 PM (in response to sotherls)

are you saying that if there is a possible way to set the bandwidth of an interface on NPM to a value of 0.1?
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- Re: Possible to set default tunnel bandwidth?
  
  sotherls Feb 27, 2015 10:55 AM (in response to ice)
  
  Ice, what we are finding is that when I check the bandwidth setting for a Cisco tunnel it is set to 0.1 by default. I am not sure how this gets set. We have to go back in and tweak it to 100 and then we get proper readings.
  
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  - Re: Possible to set default tunnel bandwidth?
    
    ice Feb 27, 2015 6:01 PM (in response to sotherls)
    
    go to the interface details page for that interface - Edit Interface
    
    tick Custom bandwidth set the TX and RX to 100 MB
    
    save the settings
    
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    - Re: Possible to set default tunnel bandwidth?
      
      sotherls Mar 2, 2015 6:39 AM (in response to ice)
      
      Thanks Ice, that is what we have been doing but I want to know if it is possible to have a default setting rather than having to click through each individual one. One a t a time is a pain.
      
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      - Re: Possible to set default tunnel bandwidth?
        
        ecklerwr1 Mar 2, 2015 7:27 AM (in response to sotherls)
        
        I'm curious how they would have ever come up with a default like .1??? What is the thinking behind this? Was this just some random default or what? I thought many of the other default values where was weird like -12348764824 or something strange like that so I don't know where .1 came from??? Who has that as a BW on a tunnel???
        
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        Re: Possible to set default tunnel bandwidth?
        
        RichardLetts Mar 2, 2015 5:04 PM (in response to ecklerwr1)
        
        Complain to your equipment vendor; it's the default value reported (by cisco at least) for their tunnel interfaces:
        
        IF-MIB::ifDescr.15 = STRING: Tunnel1
        
        IF-MIB::ifType.15 = INTEGER: tunnel(131)
        
        IF-MIB::ifMtu.15 = INTEGER: 17916
        
        IF-MIB::ifSpeed.15 = Gauge32: 100000
        
        IF-MIB::ifAdminStatus.15 = INTEGER: up(1)
        
        IF-MIB::ifOperStatus.15 = INTEGER: up(1)
        
        If you don't bother to set the bandwidth in the interface definition then that's what it reports...
        
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      - Re: Possible to set default tunnel bandwidth?
        
        RichardLetts Mar 2, 2015 5:06 PM (in response to sotherls)
        
        Have you put bandwidth statements on the tunnel interface definition on your (cisco) router?
        
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        Re: Possible to set default tunnel bandwidth?
        
        sotherls Mar 3, 2015 1:36 PM (in response to RichardLetts)
        
        Good conversation!
        
        Ok, Richard, how does putting the bandwidth statement in the tunnel interface definition help?
        
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        Re: Possible to set default tunnel bandwidth?
        
        RichardLetts Mar 3, 2015 4:09 PM (in response to sotherls)
        
        on a cisco router if you specify the bandwidth statement on the interface definition it reports it in the SNMP.
        
        e.g. (a cisco vlan interface)
        interface GigabitEthernet0/1.105
        bandwidth 50000
        
        results in the following reported interface speed:
        IF-MIB::ifDescr.7 = STRING: GigabitEthernet0/1.105
        IF-MIB::ifType.7 = INTEGER: l2vlan(135)
        IF-MIB::ifSpeed.7 = Gauge32: 50000000
        
        [note: this doesn't change the physical layer speed, just the bandwidth reported/used for routing and other protocols... in this case we have a school district with a 50Mbps QMOE service (on a 100Mbps bearer) and we want to get alerts if they start to reach that level of usage, so we configure bandwidth statements on the vlan interface. Same principle applies for tunnel interface]
        1 of 1 people found this helpful
        
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        Re: Possible to set default tunnel bandwidth?
        
        ecklerwr1 Apr 8, 2016 10:32 AM (in response to RichardLetts)
        
        Exactly if you don't do this NPM won't know what it is unless you set it!
        
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Re: Possible to set default tunnel bandwidth?

ice Apr 8, 2016 3:19 PM (in response to sotherls)

NPM uses RFC1213 and for Interface OID, it uses the following:

https://support.solarwinds.com/Success_Center/Network_Performance_Monitor_(NPM)/What_object_IDs_(OIDs)_does_NPM_poll_for…

Free RFC1213-MIB SNMP MIB Download - Free MIB Download - Search MIBs - OiDViEW

ifSpeed 1.3.6.1.2.1.2.2.1.5

whatever you have default speed set on the interface/port of your device/node, it will reflect on the SNMP of your device and node. NPM will throw this OID to check what is your interface speed for this interface - and your device will return it.

now that will be the value it will use for your Interface % utilization. TX/RX / Interface bandwidth x100%

so if you have not change it on your device let say your WAN interface, there is an option on NPM you can set it to custom bandwidth. now if you do not want to that - even if you have not yet added it on NPM, or you do not have any monitoring, it will be a best practice to change the interface speed of a link if you are referencing to a speed/bandwidth like your ISP.
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