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NAME

cdpd - view the neighbors of the storage controller that are discovered using Cisco Discovery Protocol(CDP) v1 and associated statistics

SYNOPSIS

cdpd show-neighbors [ -v ]

cdpd show-stats

cdpd zero-stats

DESCRIPTION

The cdpd command displays information of the devices that advertise themselves via the CDPv1 protocol. Such devices are referred to as CDP neighbors of the storage controller on this page.

The cdpd command also displays CDP daemon statistics.

The cdpd command is available only if cdpd is enabled by setting the option cdpd.enable to ON.

Using the cdpd show-neighbors command, you can view the summary or verbose information about the storage controller's CDP neighbors. CDP neighbors are discovered by the storage controller using the CDP version 1 protocol.

Using the cdpd show-stats command, you can view the receive and transmit statistics of CDP advertisements.

Using the cdpd zero-stats command, you can zero out the receive and transmit statistics displayed by the cdpd show-stats command.

OPTIONS

show-neighbors
prints a summary of CDP neighbor information. Use the -v sub-option to print additional information about the platform version and IP addresses of the remote device.

show-stats
prints the receive and transmit statistics of the CDPv1 daemon. This information is useful when looking for errors or failures reported by the CDP daemon.

zero-stats
allows the zeroing of statistics printed so far by the show-stats option.

DISPLAYS

The summary neighbor statistics displayed with the show-neighbors option lists a number of columns. These are described below.

The column labeled "Local Port" displays the name of the local network port receiving the CDP advertisement.

The column labeled "Remote Device" displays the name of the remote device as received in the CDP advertisement.

The column labeled "Remote Interface" displays the name of the remote network port sending the CDP advertisement.

The column labeled "Remote Platform" displays the platform ID as received in the CDP advertisement.

The column labeled "Hold Time" displays the time for which the CDP advertisement is cached locally. This value is sent by the remote device in its CDP advertisement.

The column labeled "Remote Capability" describes the capabilities of the remote device. The possible capabilities that may be displayed are "R" for "Router", "T" for "Transparent Bridge", "B" for "Source Route Bridge", "S" for "Switch", "H" for "Host", "I" for "IGMP report forwarder", "r" for "Repeater" and "P" for "Phone".

CLUSTER CONSIDERATIONS

CDP is an L2 protocol and the information displayed is related to the properties of the physical node and its network ports. During a takeover, only the information about the local node is advertised by the storage controller.

VFILER AND IPSPACE CONSIDERATIONS

CDP is completely unaware of vfilers and/or IP spaces that may exist on the storage controller system. It is therefore possible that a CDP advertisement from a particular physical port will contain IP addresses belonging to multiple vfilers if those vfiler IP addresses are configured on that physical port, or on a vif or vlan above the physical port.

Similarly VLANs on the same physical port may be configured in several different IP spaces. In this case, CDP advertisements sent by the underlying physical port may contain IP addresses belonging to different IP spaces.

LIMITATIONS

Only the CDP version 1 neighbor capabilities can be viewed. CDP version 1 advertisements are sent out only on interfaces that are configured with IPv4 addresses.

DIAGNOSTICS

The cdpd show-stats command is useful for diagnosing network level connectivity if the cdpd show-neighbors command does not display the expected set of CDP compliant devices.

NOTES

CDPv1 is a proprietary Cisco protocol. The storage controller advertises its capabilities using the CDPv1 protocol on each of its physical ports. Therefore, the storage controller system can be discovered by other CDP compliant devices in the network. Conversely, the storage controller system learns about CDP compliant devices on the network by processing the CDPv1 advertisements that it receives from its neighbors.

The options cdpd.holdtime command can be used to alter the holdtime value advertised by the storage controller via the CDPv1 protocol.

The options cdpd.interval command can be used to alter the interval at which CDPv1 advertisements are sent by the storage controller.

SEE ALSO

na_options(1)


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