09-09-2009 03:52 AM
I keep getting a high utilization warning in DFM for a GRE tunnel. How do you configure the threshold for a GRE tunnel or remove checking it's utilization?
Name Value
Event_Description HighUtilization
Component IF-<removed>/16 [Tu2] [192.168.100.17] [GRE Tunnel to <removed>]
ComponentClass Interface
ComponentEventCode 1056
Type TUNNEL
MaxSpeed 9000
CurrentUtilization 100.474075 %
InputPacketRate 3.6 PPS
TrafficRate 1130.3334 BYPS
UtilizationThreshold 80
DuplexMode FULLDUPLEX
OutputPacketRate 3.1208334 PPS
09-09-2009 08:19 AM
The problem here is that the utilization is above 100%. In cases of tunnel interfaces, this typically means the bandwidth set on the tunnel is lower than the actual bandwidth, and DFM is using the wrong value for ifSpeed when calculating utilization. Use the interface "bandwidth" command to set the correct ifSpeed on the interface, then rediscover the device in DFM.
09-10-2009 04:08 AM
Are you saying that I need to have bandwidth configured on the WAN interface and the tunnel interface?
Here is what I currently have. The multilink is a 9Mbps consisting of 4 T1s.
interface Multilink1
description
ip address
ip route-cache flow
no cdp enable
ppp multilink
ppp multilink fragment disable
ppp multilink group 1
crypto map INBOUND_CUSTOMERS
crypto ipsec df-bit clear
interface Tunnel2
description GRE Tunnel to
ip address
ip mtu 1420
ip tcp adjust-mss 1350
tunnel source Loopback1
tunnel destination
09-10-2009 07:49 AM
If you're sure that the maximum bandwidth of the link is only 9 Mbps, then you may be seeing a bug in DFM in which bogus utilization values are shown (i.e. those over 100%). In order to determine if this is the problem, you should start a sniffer trace filtering on all SNMP traffic to this device, and let it run for at least 8 minutes.
Assuming the high utilization event is still active in DFM after these 8 minutes, then the data in the trace will show if the device is reporting a utilization over 100%, or if the problem is DFM. If it's DFM, then an upgrade to LMS 3.2 will fix this.
09-10-2009 08:45 AM
Actually I misspoke. Four T1s would be 6Mbps. I am sure of the speed. I will try the packet capture you recommended. There is another bug that I have found that requires the upgrade to LMS3.2 so I'm betting this is related.
09-10-2009 09:11 AM
Here are the sh ints for the multilink and the tunnel. I see the multilink showing up as approx 6Mbps and the tunnels shows up at 9Mbps. I ran the snmp capture and indeed see interface with index 16 (tunnel2) as reporting 9Mbps. Where is it getting the 9Mbps from? I don't have it specified on the tunnel2 interface.
Multilink1 is up, line protocol is up
Hardware is multilink group interface
Description:
Internet address is
MTU 1500 bytes, BW 6144 Kbit, DLY 100000 usec,
Tunnel2 is up, line protocol is up
Hardware is Tunnel
Description: GRE Tunnel to
Internet address is
MTU 1514 bytes, BW 9 Kbit, DLY 500000 usec,
09-10-2009 08:35 AM
Okay, I see. The device is reporting 9 Kbps instead of 9 Mbs. Add the following config under interface Tunnel2:
bandwidth 9000
Then rediscover the device in DFM. The speed of the interface should change.
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