Cisco 6509 - SolarWinds Orion reports high VLAN discards?

We use Solarwinds Orion, Network Performance monitor. Seems like a great tool. This morning is started reporting this:

"Interface - Vlan172 - Vl172 for node has a transmitted utilization of 91 which is greater than the threshold of 75%."

How would I begin to troubleshoot what the issue is?
Thanks Experts!
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PapaSmurffAuthor Commented:
Status      Up      Up
       Name             Vlan172 - Vl172
       Index             209
       Interface Type      Proprietary Virtual      Proprietary Virtual
       MAC Address             0025.B447.FF00
       IP Address   
       Administrative Status      Up      Up
       Operational Status      Up      Up
       Last Status Change             2/24/2014 11:33 AM
                     Receive      Transmit
       Interface Bandwidth             1.0 Gbps       1.0 Gbps
       Current Traffic             19.022 Mbps       927.742 Mbps
       Percent Utilization             2 %       93 %
       Packets per Second             31555.0 pps       78359.0 pps
       Average Packet Size             75 bytes       1.5 kbytes
       MTU             1.5 kbytes
       Configured Interface Speed             1.0 Gbps
       Counter 64 Support             Yes
PapaSmurffAuthor Commented:
HCRHS_MDF_6509#show int vlan 172
Vlan172 is up, line protocol is up
  Hardware is EtherSVI, address is 0025.b447.ff00 (bia 0025.b447.ff00)
  Internet address is
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 219/255, rxload 4/255
  Encapsulation ARPA, loopback not set
  Keepalive not supported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/1998696212/1586986 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 19359000 bits/sec, 32028 packets/sec
  5 minute output rate 860444000 bits/sec, 72782 packets/sec
  L2 Switched: ucast: 127038672882 pkt, 15169767049924 bytes - mcast: 2139374056 pkt, 198737169629 bytes
  L3 in Switched: ucast: 138541996227 pkt, 31440704968554 bytes - mcast: 194998042 pkt, 31635883521 bytes mcast
  L3 out Switched: ucast: 237331408719 pkt, 239631682055799 bytes mcast: 43267190 pkt, 61257169563 bytes
     151951518504 packets input, 32690464500805 bytes, 0 no buffer
     Received 2022814185 broadcasts (220116510 IP multicasts)
     0 runts, 0 giants, 34247793 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     238911445583 packets output, 239447218058184 bytes, 0 underruns
     0 output errors, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out
This message is not an error, it is simply reporting that 91% of the VLAN interface's bandwidth is being used up.  A Netflow collector would be the best tool to see what is using the bandwidth.  Your Solar Winds server may or may not have a Netflow tool already installed on it.  If not, there is one available on the Solar Winds free downloads page.

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