Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

DFM threshold metric

Hi, Plz tell me as value of threshold as broadcast threshold,Error traffic threshold,Utilization threshold,Queue drop threshold,Error threshold,Collision threshold,Discard threshold is in metric of percentage. Can u tell me that value for which it is in percentage. I mean as utilzation threshold is 40%, i wanna to know the value of 100 %. mean what is full value for that it is 40%.

thanks

2 REPLIES
Silver

Re: DFM threshold metric

The threshold is caculated on the available bandwidth based on the ifSpeed reported.

.iso.org.dod.internet.mgmt.mib-2.interfaces.ifTable.ifEntry.ifSpeed

.1.3.6.1.2.1.2.2.1.5

So the bandwidth of an ethernet interface is 10Mbits, Fastethernet 100mbits, etc.

It does not take into account if an interface is full duplex.

Cheers,

Michel

Silver

Re: DFM threshold metric

Hi Parveen,

your questions may be answered here:

http://www.cisco.com/univercd/cc/td/doc/product/rtrmgmt/cw2000/dfm/dfm206/ug/cfgpt.htm#wp1284911

e.g.

Utilization threshold

The upper threshold for link utilization, expressed as a percentage of the total bandwidth.

DFM uses the DuplexMode special variable to specify duplexity (UNSPECIFIED, by default), and DuplexSource to track the duplexity setting source (NONE by default). (For information on the DuplexMode special variable, refer to Table 8-4.) DFM uses the following algorithm to determine duplexity:

1. DFM checks the portDuplexity MIB attribute in the CISCO-STACK-MIB, and:

a. If the value is set to either half duplex or full duplex, DFM uses that setting for DuplexMode and sets DuplexSource to ENTERPRISE_MIB.

b. If the device is not a Cisco stack switch, the portDuplexity attribute is not present, or the portDuplexity attribute is present but its value is auto/disagree, DFM proceeds to Step 2.

2. DFM checks the dot3StatsDuplexStatus MIB attribute in the ETHERLIKE-MIB, and:

a. If the value is set to either half duplex or full duplex, DFM uses that setting for DuplexMode and sets DuplexSource to ETHERLIKE_MIB.

b. If the dot3StatsDuplexStatus attribute is not present, or it is present but its value is unknown, DFM proceeds to Step 3.

3. DFM checks the cdpCacheDuplex MIB attribute in the CISCO-CDP-MIB, and:

a. If the value is set to either half duplex or full duplex, DFM uses that setting for DuplexMode (for both local and remote ports), and sets DuplexSource to NEIGHBOR_MIB.

b. If the value is unknown, DFM proceeds to Step 4.

4. If DFM cannot correctly determine the duplex mode (because it was not set manually nor was it set in the MIB), DFM will set DuplexSource to ASSUMED and do the following:

a. If the interface is a 10-MB Ethernet interface, DFM will assume the setting is half duplex. (DFM considers an interface to be 10-MB Ethernet when its Type="*ETHER*" and its MaxSpeed=10000000.)

b. For all other interfaces, DFM will assume the setting is full duplex.

Even to the other threshold the calculation is mentioned:

Collision threshold

The upper threshold for collisions, expressed as a percentage of the total number of output packets. This threshold applies only to Ethernet settings for ports, trunks, and interfaces.

Have fun with these documentation.

;-)

best regards,

Frank

136
Views
9
Helpful
2
Replies
CreatePlease login to create content