display ipv6 nd security timestamp

Function

The display ipv6 nd security timestamp command displays the time stamp value of the last received and accepted SEND message (RDlast) and the local time at which the last SEND message for this peer is accepted (TSlast). The receiver records the two time values after receiving an SEND message.

Format

display ipv6 nd security timestamp interface-type interface-number

Parameters

Parameter	Description	Value
interface-type interface-number	Specifies the type and the number of an interface. That is, the RDlast and the TSlast values of the SEND message on the specified interface is displayed.	-

Views

All views

Default Level

1: Monitoring level

Usage Guidelines

Usage Scenario

You can run the display ipv6 nd security timestamp command to view the RDlast and the TSlast values of an SEND message on an interface. Then, you can determine whether the difference between the receive time and the send time of the SEND message is out of the allowed time range based on the following formula.

When a message is received from a new peer:

-delta-value < (RDnew - TSnew) < +delta-value
When a message is received from a known peer:

TSnew + fuzz-value > TSlast + (RDnew - RDlast) x (1 - drift-value) - fuzz-value

fuzz-value, drift-value, and fuzz-value: parameters in the ipv6 nd security timestamp command
RDnew: the local time at which the new SEND message is received
RDlast: the local time at which the last SEND message for this peer is accepted
TSnew: the time stamp value present in the new received SEND message (the time is recorded by the sender in the Timestamp option in the newly sent ND message)
TSlast: the time stamp value of the last received and accepted SEND message (the time is recorded by the sender in the Timestamp option in the last sent ND message)

Precautions

If no neighbor relationship is set up or no SEND message is transmitted between a local interface and a remote interface, running the display ipv6 nd security timestamp command does not display any command output.

Example

# Display the RDlast and the TSlast values of an SEND message.

<sysname> display ipv6 nd security timestamp GigabitEthernet 0/0/0

Total Number of Timestamp Entries : 2
Peer Address : FE80::1812:16D1:319F:B44F
TSlast       : 4c209e350000
RDlast       : 4c209e350000
                             
Peer Address : FE80::3066:6FC:B4D7:5891
TSlast       : 4c209e360000
RDlast       : 4c209e360000

**Table 1** Description of the **display ipv6 nd security timestamp** command output
Item	Description
Total Number of Timestamp Entries	Total number of timestamp entries
Peer Address	IPv6 address of a peer interface
RDlast	The local time at which the last SEND message for this peer is accepted
TSlast	The time stamp value of the last received and accepted SEND message