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cdpd - view the neighbors of the storage controller that
are discovered using Cisco Discovery Protocol(CDP) v1 and
associated statistics
cdpd show-neighbors [ -v ]
cdpd show-stats
cdpd zero-stats
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.
-
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.
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".
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.
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.
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.
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.
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.
na_options(1)
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