illumos: manual page: ipmpstat.8

IPMPSTAT(8) Maintenance Commands and Procedures IPMPSTAT(8)

NAME

ipmpstat - display IPMP subsystem status

SYNOPSIS

ipmpstat [-n] [-o field[,...] [-P]] -a|-g|-i|-p|-t

DESCRIPTION

The ipmpstat command concisely displays information about the IPMP
subsystem. It supports five different output modes, each of which
provides a different view of the IPMP subsystem (address, group,
interface, probe, and target), described below. At most one output mode
may be specified per invocation, and the displayed information is
guaranteed to be self-consistent. It also provides a parsable output
format which may be used by scripts to examine the state of the IPMP
subsystem. Only basic privileges are needed to invoke ipmpstat, with the
exception of probe mode which requires all privileges.

OPTIONS

The following options are supported:

-a

Display IPMP data address information ("address" output mode).

-g

Display IPMP group information ("group" output mode).

-i

Display IP interface information ("interface" output mode).

-n

Display IP addresses numerically, rather than attempting to resolve
them to hostnames. This option may be used in any output mode.

-o field[,...]

Display only the specified output fields, in order. The list of field
names is case-insensitive and comma-separated. The field names that
are supported depend on the selected output mode, described below.
The special field name all may be used to display all fields for a
given output mode.

-p

Display IPMP probe information ("probe" output mode).

-t

Display IPMP target information ("target" output mode).

-P

Display using a machine-parsable format, described below. If this
option is specified, an explicit list of fields must be specified
using the -o option.

OUTPUT MODES

The ipmpstat utility supports the output modes listed below. Note that
these modes map to some of the options described above.

Address Mode

Address mode displays the state of all IPMP data addresses on the
system. The following output fields are supported:

ADDRESS

The hostname (or IP address) associated with the information.
Note that because duplicate down addresses may exist, the address
must be taken together with the GROUP to form a unique identity.
For a given IPMP group, if duplicate addresses exist, at most one
will be displayed, and an up address will always take precedence.

STATE

The state of the address. Either up if the address is IFF_UP (see
ifconfig(8)), or down if the address is not IFF_UP.

GROUP

The IPMP IP interface hosting the address.

INBOUND

The underlying IP interface that will receive packets for this
address. This may change in response to external events such as
IP interface failure. If this field is empty, then the system
will not accept IP packets sent to this address (for example,
because the address is down or because there are no active IP
interfaces left in the IPMP group).

OUTBOUND

The underlying IP interfaces that will send packets using this
source address. This may change in response to external events
such as IP interface failure. If this field is empty, then the
system will not send packets with this address as a source (for
example, because the address is down or because there are no
active IP interfaces left in the IPMP group).

If -o is not specified, all output fields are displayed.

Group Mode

Group mode displays the state of all IPMP groups on the system. The
following output fields are supported:

GROUP

The IPMP IP interface name associated with the information. For
the anonymous group (see in.mpathd(8)), this field will be empty.

GROUPNAME

The IPMP group name. For the anonymous group, this field will be
empty.

STATE

The state of the group:

ok
All interfaces in the group are usable.

degraded
Some (but not all) interfaces in the group are
usable.

failed
No interfaces in the group are usable.

FDT

The probe-based failure detection time. If probe-based failure
detection is disabled, this field will be empty.

INTERFACES

The list of underlying IP interfaces in the group. The list is
divided into three parts:

1. Active interfaces are listed first and not enclosed in
any brackets or parenthesis. Active interfaces are
those being used by the system to send or receive data
traffic.

2. INACTIVE interfaces are listed next and enclosed in
parenthesis. INACTIVE interfaces are those that are
functioning, but not being used according to
administrative policy.

3. Unusable interfaces are listed last and enclosed in
brackets. Unusable interfaces are those that cannot be
used at all in their present configuration (for
example, FAILED or OFFLINE).

If -o is not specified, all output fields are displayed.

Interface Mode

Interface mode displays the state of all IP interfaces that are
tracked by in.mpathd on the system. The following output fields are
supported:

INTERFACE

The IP interface name associated with the information.

ACTIVE

Either yes or no, depending on whether the IP interface is being
used by the system for IP data traffic.

GROUP

The IPMP IP interface associated with the IP interface. For IP
interfaces in the anonymous group (see in.mpathd(8)), this field
will be empty.

FLAGS

Assorted information about the IP interface:

i
Unusable due to being INACTIVE.

s
Marked STANDBY.

m
Nominated to send/receive IPv4 multicast for its IPMP group.

b
Nominated to send/receive IPv4 broadcast for its IPMP group.

M
Nominated to send/receive IPv6 multicast for its IPMP group.

d
Unusable due to being down.

h
Unusable due to being brought OFFLINE by in.mpathd because
of a duplicate hardware address.

LINK

The state of link-based failure detection:

up

The link is up.

down

The link is down.

unknown

The network driver does not report link state changes.

PROBE

The state of probe-based failure detection:

ok

Probes detect no problems.

failed

Probes detect failure.

unknown

Probes cannot be sent since no suitable probe targets are
known.

disabled

Probes have been disabled because a unique IP test address
has not been configured.

STATE

The overall state of the interface:

ok

The interface is online and functioning properly based on the
configured failure detection methods.

failed

The interface is online but has a link state of down or a
probe state of failed.

offline

The interface is offline.

unknown

The interface is online but may or may not be functioning
because the configured failure detection methods are in
unknown states.

If -o is not specified, all output fields are displayed.

Probe Mode

Probe mode displays information about the probes being sent by
in.mpathd. Unlike other output modes, this mode runs until
explicitly terminated using Ctrl-C. The following output fields are
supported:

TIME

The time the probe was sent, relative to when ipmpstat was
started. If the probe was sent prior to starting ipmpstat, the
time will be negative.

PROBE

An identifier representing the probe. The identifier will start
at zero and will monotonically increment for each probe sent by
in.mpathd over a given interface. To enable more detailed
analysis by packet monitoring tools, this identifier matches the
icmp_seq field of the ICMP probe packet.

INTERFACE

The IP interface the probe was sent on.

TARGET

The hostname (or IP address) of the target the probe was sent to.

NETRTT

The network round-trip-time for the probe. This is the time
between when the IP module sends the probe and when the IP module
receives the acknowledgment. If in.mpathd has concluded that the
probe has been lost, this field will be empty.

RTT

The total round-trip-time for the probe. This is the time between
when in.mpathd starts executing the code to send the probe, and
when it completes processing the ack. If in.mpathd has concluded
that the probe has been lost, this field will be empty. Spikes in
the total round-trip time that are not present in the network
round-trip time indicate that the local system itself is
overloaded.

RTTAVG

The average round-trip-time to TARGET over INTERFACE. This aids
identification of slow targets. If there is insufficient data to
calculate the average, this field will be empty.

RTTDEV

The standard deviation for the round-trip-time to TARGET over
INTERFACE. This aids identification of jittery targets. If there
is insufficient data to calculate the standard deviation, this
field will be empty.

If -o is not specified, all fields except for RTTAVG and RTTDEV are
displayed.

Target Mode

Target mode displays IPMP probe target information. The following
output fields are supported:

INTERFACE

The IP interface name associated with the information.

MODE

The probe target discovery mode:

routes
Probe targets found by means of the routing table.

multicast
Probe targets found by means of multicast ICMP
probes.

disabled
Probe-based failure detection is disabled.

TESTADDR

The hostname (or IP address) that will be used for sending and
receiving probes. If a unique test address has not been
configured, this field will be empty. Note that if an IP
interface is configured with both IPv4 and IPv6 test addresses,
probe target information will be displayed separately for each
test address.

TARGETS

A space-separated list of probe target hostnames (or IP
addresses), in firing order. If no probe targets could be found,
this field will be empty.

If -o is not specified, all output fields are displayed.

OUTPUT FORMAT

By default, ipmpstat uses a human-friendly tabular format for its output
modes, where each row contains one or more fields of information about a
given object, which is in turn uniquely identified by one or more of
those fields. In this format, a header identifying the fields is
displayed above the table (and after each screenful of information),
fields are separated by whitespace, empty fields are represented by --
(double hyphens), and other visual aids are used. If the value for a
field cannot be determined, its value will be displayed as "?" and a
diagnostic message will be output to standard error.

Machine-parsable format also uses a tabular format, but is designed to be
efficient to programmatically parse. Specifically, machine-parsable
format differs from human-friendly format in the following ways:

o No headers are displayed.

o Fields with empty values yield no output, rather than showing
--.

o Fields are separated by a single colon (:), rather than
variable amounts of whitespace.

o If multiple fields are requested, and a literal : or a
backslash (\) occur in a field's value, they are escaped by
prefixing them with \.

EXAMPLES

Example 1: Obtaining Failure Detection Time of a Specific Interface

The following code uses the machine-parsable output format to create a
ksh function that outputs the failure detection time of a given IPMP IP
interface:

getfdt() {
ipmpstat -gP -o group,fdt | while IFS=: read group fdt; do
[[ "$group" = "$1" ]] && { echo "$fdt"; return; }
done
}

ATTRIBUTES