Configuring the neighbor cache

Configure the address translation table used to map IPv6 addresses to physical addresses. You can manually add static neighbors to the cache.

Note

Note

IPv6 static neighbors are not supported on SMLT.

Before you begin

Change the VRF instance as required to configure neighbor cache on a specific VRF instance. Not all parameters are configurable on non-default VRFs.

About this task

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.

Procedure

  1. In the navigation tree, expand the following folders: Configuration > IPv6.
  2. Click IPv6.
  3. Click the Neighbors tab.
  4. Click Insert.
  5. Beside the Interface field, click Port or Port in Vlan.
  6. Select a port or VLAN.
  7. Configure the remaining parameters as required.
  8. Click Insert.
  9. Click Apply.

Neighbors Field Descriptions

Use the data in the following table to use the Neighbors tab.

Name

Description

Interface

Specifies the interface to which this entry applies.

NetAddress

Specifies the IP address of the media-dependent physical address.

PhyAddress

Specifies the MAC address.

Interface

Specifies a physical port ID or an MLT port ID.

LastUpdated

Specifies the value of sysUpTime of the last modification to this entry. If the entry was created prior to the last reinitialization of the local management subsystem, the object contains a zero value.

Type

Specifies the mapping type from manually configured entries. While the selection of either dynamic, static, or local is allowed; static is currently the only valid selection.

State
Specifies the Neighbor Unreachability Detection state for the interface after 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. The 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

BMac

Specifies the backbone MAC address.

Cvid

Specifies the customer VID.
9037147-00 Rev AB