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Monitoring Route Information

To view the inet.0 (IPv4) routing table in the J-Web interface, select Monitor>Routing>Route Information, or enter the following CLI commands:

Table 42 summarizes key output fields in the routing information display.

Table 42: Summary of Key Routing Information Output Fields

Field

Values

Additional Information

n destinations

Number of destinations for which there are routes in the routing table.

 

n routes

Number of routes in the routing table:

  • active—Number of routes that are active.
  • holddown—Number of routes that are in hold-down state (neither advertised nor updated) before being declared inactive.
  • hidden—Number of routes not used because of routing policies configured on the device.
 

Destination

Destination address of the route.

 

Protocol/ Preference

Protocol from which the route was learned: Static, Direct, Local, or the name of a particular protocol.

The preference is the individual preference value for the route.

The route preference is used as one of the route selection criteria.

Next-Hop

Network layer address of the directly reachable neighboring system (if applicable) and the interface used to reach it.

If a next hop is listed as Discard, all traffic with that destination address is discarded rather than routed. This value generally means that the route is a static route for which the discard attribute has been set.

If a next hop is listed as Reject, all traffic with that destination address is rejected. This value generally means that the address is unreachable. For example, if the address is a configured interface address and the interface is unavailable, traffic bound for that address is rejected.

If a next hop is listed as Local, the destination is an address on the host (either the loopback address or Ethernet management port 0 address, for example).

Age

How long the route has been known.

 

State

Flags for this route.

There are many possible flags. For a complete description, see the JUNOS Interfaces Command Reference.

AS Path

AS path through which the route was learned. The letters of the AS path indicate the path origin:

  • I — IGP.
  • E — EGP.
  • ? — Incomplete. Typically, the AS path was aggregated.
 

For more information about the J-Web Monitor task, see Monitor Tasks.


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