Path trace prerequisites

You run a path trace to generate path views. A path trace can fail because any of the devices involved in the path do not satisfy path trace prerequisites. Use this information to ensure that all path trace prerequisites are met.

Prerequisites

The devices involved in the path must meet the following requirements:
SNMP access
  • All devices specified when running the path trace must provide SNMP access so that the path trace operation can access relevant MIB variables in the device. For one-way paths, the source device (specified in the From field in the Trace IPv4 Network Path window) and the devices along the route (specified in the Via field) must allow SNMP access. For return paths, the source device, the devices along the route, and the target device (specified in the To field) must allow SNMP access.
  • All routers identified by the path trace operation as next hop devices along the path must allow SNMP access.
Routing information
  • All devices specified when running the path trace must provide basic routing information. For one-way paths, the source device (specified in the From field) and the devices along the route (specified in the Via field) must at a minimum store information on the next hop device. For return paths, the source device, the devices along the route, and the target device (specified in the To field) must store information on the next hop device.
  • All routers identified by the path trace operation as next hop devices along the path must support the following MIB variables:
    General MIB variables
    • sysName
    • ifName
    • ifType
    • ifConnectorPresent
    • ipAdEntIfIndex
    Routers identified by the path trace operation as next hop devices along the path must, in addition, support either of the following sets of MIB variables that govern routing:
    Classless Inter-Domain Routing (CIDR) MIB variables
    This set of routing variables is made up of the following MIB variables:
    • ipCidrRouteNumber
    • ipCidrRouteIfIndex
    • ipCidrRouteDest
    • ipCidrRouteMask
    • ipCidrRouteType
    • ipCidrRouteMetric1
    • ipCidrRouteNextHop
    • ipCidrRouteProto
    IP route MIB variables
    This set of routing variables is made up of the following MIB variables:
    • ipRouteIfIndex
    • ipRouteDest
    • ipRouteMask
    • ipRouteType
    • ipRouteMetric1
    • ipRouteNextHop
    • ipRouteProto