Viewing the neighbor cache with Device Manager

View the neighbor cache to discover information about neighbors in your network. Neighbor cache in IPv6 is similar to the IPv4 Address Resolution Protocol (ARP) table. The neighbor cache is a set of entries for individual neighbors to which traffic was sent recently. You make entries on the neighbor on-link unicast IP address, including information such as the link-layer address. A neighbor cache entry contains information used by the Neighbor Unreachability Detection algorithm, including the reachability state, the number of unanswered probes, and the time the next Neighbor Unreachability Detection event is scheduled.

View neighbor cache


Step Action

1

From Device Manager menu bar, click the IPv6 tab.

The Ipv6 dialog box appears with the Globals window displayed.

2

Click the Neighbors tab.

The Neighbors window appears.

3

View the values in each field.


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Job aid

Use the data in this table to help you view the Neighbors tab.

Variable definitions

Variable Definition
IfIndex A unique value to identify a physical interface or a logical interface (VLAN). For the VLAN, the value is the Ifindex of the VLAN.
NetAddress The IPv6 address corresponding to the media-dependent physical address.
PhysAddress The media-dependent physical address. The range is 0 through 65535. For Ethernet, this is a MAC address.
Interface Either a physical port ID or the Multi-Link Trunking port ID. This entry is associated either with a port or with the Multi-Link Trunking in a VLAN.
LastUpdated The value of sysUpTime at the time this entry was last updated. If this entry was updated prior to the last reinitialization of the local network management subsystem, this object contains a zero value.
Type

The type of mapping is as follows:

  • Dynamic type—indicates that the IP address to the physical address mapping is dynamically resolved using, for example, IPv4 ARP or the IPv6 Neighbor Discovery Protocol.
  • Static type—indicates that the mapping is statically configured.
  • Local type—indicates that the mapping is provided for the interface address.

The default is static.

State

Specifies the Neighbor Unreachability Detection state for the interface when the address mapping in this entry is used. If Neighbor Unreachability Detection is not in use (for example, for IPv4), this object is always unknown. Options include the following:

  • reachable—confirmed reachability
  • stale—unconfirmed reachability
  • delay—waiting for reachability confirmation before entering the probe state
  • probe—actively probing
  • invalid—an invalidated mapping
  • unknown—state cannot be determined
  • incomplete—address resolution is being performed