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Old 03-15-2010, 03:52 AM
netbrain-tac netbrain-tac is offline
 
Join Date: Dec 2009
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Default Troubleshoot Path Discovery Failure

There can be many reasons why the system fails to find a path. For examples,

l There exists MPLS cloud in your network
For most MPLS networks, customers are not able to get the MPLS route table. Therefore, the system failed to find the path due to the lack of route tables

To solve the problem, you can add a MPLS Cloud manually and run Simulation to calculate the route table, then use the simulation result to draw the path.

l The IP address is transmitted by NAT

Currently only static NAT is supported. If the network uses dynamic NAT, the system does not know the NAT live status. Therefore, the path calculation may be inaccurate.

l The SNMP request is denied by Firewalls

l The SNMP request is denied by ACLs

l HSRP or VRRP is configured on the devices

For HSRP/VRRP-enabled devices, when drawing a path, the system cannot get the live status of HSRP/VRRP, which may affect the path calculation.

Before mapping the traffic path, check the followings:
  • Make sure that device setting is correct in corresponding devices. If not, run the tune live access.
  • Make sure that the local computer can access the device via the methods set in the Device Settings.
  • If you select the method as Live discovery via SNMP, make sure that SNMP is enabled on all the corresponding devices in the network.
  • Make sure that the SNMP RO string of the Device Setting of every device matches the RO string set on the live device. You can run the tune live access feature to automatically set SNMP strings.
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