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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | FILES | AUTHORS | COLOPHON |
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IBNETDISCOVER(8) Open IB Diagnostics IBNETDISCOVER(8)
IBNETDISCOVER - discover InfiniBand topology
ibnetdiscover [options] [<topology-file>]
ibnetdiscover performs IB subnet discovery and outputs a human
readable topology file. GUIDs, node types, and port numbers are
displayed as well as port LIDs and NodeDescriptions. All nodes
(and links) are displayed (full topology). Optionally, this
utility can be used to list the current connected nodes by
nodetype. The output is printed to standard output unless a
topology file is specified.
-l, --list List of connected nodes
-g, --grouping Show grouping. Grouping correlates IB nodes by
different vendor specific schemes. It may also show the switch
external ports correspondence.
-H, --Hca_list List of connected CAs
-S, --Switch_list List of connected switches
-R, --Router_list List of connected routers
-s, --show Show progress information during discovery.
-f, --full Show full information (ports' speed and width, vlcap)
-p, --ports Obtain a ports report which is a list of connected
ports with relevant information (like LID, portnum, GUID, width,
speed, and NodeDescription).
-m, --max_hops Report max hops discovered.
--outstanding_smps, -o <val>
Specify the number of outstanding SMP's which should be
issued during the scan
Default: 2
Cache File flags
--cache <filename> Cache the ibnetdiscover network data in the
specified filename. This cache may be used by other tools for
later analysis.
--load-cache <filename> Load and use the cached ibnetdiscover data
stored in the specified filename. May be useful for outputting
and learning about other fabrics or a previous state of a fabric.
--diff <filename> Load cached ibnetdiscover data and do a diff
comparison to the current network or another cache. A special
diff output for ibnetdiscover output will be displayed showing
differences between the old and current fabric. By default, the
following are compared for differences: switches, channel
adapters, routers, and port connections.
--diffcheck <key(s)> Specify what diff checks should be done in
the --diff option above. Comma separate multiple diff check
key(s). The available diff checks are: sw = switches, ca =
channel adapters, router = routers, port = port connections, lid =
lids, nodedesc = node descriptions. Note that port, lid, and
nodedesc are checked only for the node types that are specified
(e.g. sw, ca, router). If port is specified alongside lid or
nodedesc, remote port lids and node descriptions will also be
compared.
Port Selection flags
-C, --Ca <ca_name> use the specified ca_name.
-P, --Port <ca_port> use the specified ca_port.
Local port Selection
Multiple port/Multiple CA support: when no IB device or port is
specified (see the "local umad parameters" below), the libibumad
library selects the port to use by the following criteria:
1. the first port that is ACTIVE.
2. if not found, the first port that is UP (physical link up).
If a port and/or CA name is specified, the libibumad library
attempts to fulfill the user request, and will fail if it is
not possible.
For example:
ibaddr # use the first port (criteria #1 above)
ibaddr -C mthca1 # pick the best port from "mthca1" only.
ibaddr -P 2 # use the second (active/up) port from the first available IB device.
ibaddr -C mthca0 -P 2 # use the specified port only.
Configuration flags
--config, -z <config_file> Specify alternate config file.
Default:
/ssd11/FOSS/rdma-core/build/etc/infiniband-diags/ibdiag.conf
--outstanding_smps, -o <val>
Specify the number of outstanding SMP's which should be
issued during the scan
Default: 2
--node-name-map <node-name-map> Specify a node name map.
This file maps GUIDs to more user friendly names. See FILES
section.
-t, --timeout <timeout_ms> override the default timeout for the
solicited mads.
-y, --m_key <key>
use the specified M_key for requests. If non-numeric value
(like 'x') is specified then a value will be prompted for.
Debugging flags
-d raise the IB debugging level. May be used several times
(-ddd or -d -d -d).
-e show send and receive errors (timeouts and others)
-h, --help show the usage message
-v, --verbose
increase the application verbosity level. May be used
several times (-vv or -v -v -v)
-V, --version show the version info.
CONFIG FILE
/ssd11/FOSS/rdma-core/build/etc/infiniband-diags/ibdiag.conf
A global config file is provided to set some of the common options
for all tools. See supplied config file for details.
NODE NAME MAP FILE FORMAT
The node name map is used to specify user friendly names for nodes
in the output. GUIDs are used to perform the lookup.
This functionality is provided by the opensm-libs package. See
opensm(8) for the file location for your installation.
Generically:
# comment
<guid> "<name>"
Example:
# IB1
# Line cards
0x0008f104003f125c "IB1 (Rack 11 slot 1 ) ISR9288/ISR9096 Voltaire sLB-24D"
0x0008f104003f125d "IB1 (Rack 11 slot 1 ) ISR9288/ISR9096 Voltaire sLB-24D"
0x0008f104003f10d2 "IB1 (Rack 11 slot 2 ) ISR9288/ISR9096 Voltaire sLB-24D"
0x0008f104003f10d3 "IB1 (Rack 11 slot 2 ) ISR9288/ISR9096 Voltaire sLB-24D"
0x0008f104003f10bf "IB1 (Rack 11 slot 12 ) ISR9288/ISR9096 Voltaire sLB-24D"
# Spines
0x0008f10400400e2d "IB1 (Rack 11 spine 1 ) ISR9288 Voltaire sFB-12D"
0x0008f10400400e2e "IB1 (Rack 11 spine 1 ) ISR9288 Voltaire sFB-12D"
0x0008f10400400e2f "IB1 (Rack 11 spine 1 ) ISR9288 Voltaire sFB-12D"
0x0008f10400400e31 "IB1 (Rack 11 spine 2 ) ISR9288 Voltaire sFB-12D"
0x0008f10400400e32 "IB1 (Rack 11 spine 2 ) ISR9288 Voltaire sFB-12D"
# GUID Node Name
0x0008f10400411a08 "SW1 (Rack 3) ISR9024 Voltaire 9024D"
0x0008f10400411a28 "SW2 (Rack 3) ISR9024 Voltaire 9024D"
0x0008f10400411a34 "SW3 (Rack 3) ISR9024 Voltaire 9024D"
0x0008f104004119d0 "SW4 (Rack 3) ISR9024 Voltaire 9024D"
TOPOLOGY FILE FORMAT
The topology file format is human readable and largely intuitive.
Most identifiers are given textual names like vendor ID (vendid),
device ID (device ID), GUIDs of various types (sysimgguid, caguid,
switchguid, etc.). PortGUIDs are shown in parentheses (). For
switches, this is shown on the switchguid line. For CA and router
ports, it is shown on the connectivity lines. The IB node is
identified followed by the number of ports and a quoted the node
GUID. On the right of this line is a comment (#) followed by the
NodeDescription in quotes. If the node is a switch, this line
also contains whether switch port 0 is base or enhanced, and the
LID and LMC of port 0. Subsequent lines pertaining to this node
show the connectivity. On the left is the port number of the
current node. On the right is the peer node (node at other end of
link). It is identified in quotes with nodetype followed by -
followed by NodeGUID with the port number in square brackets.
Further on the right is a comment (#). What follows the comment
is dependent on the node type. If it it a switch node, it is
followed by the NodeDescription in quotes and the LID of the peer
node. If it is a CA or router node, it is followed by the local
LID and LMC and then followed by the NodeDescription in quotes and
the LID of the peer node. The active link width and speed are
then appended to the end of this output line.
An example of this is:
#
# Topology file: generated on Tue Jun 5 14:15:10 2007
#
# Max of 3 hops discovered
# Initiated from node 0008f10403960558 port 0008f10403960559
Non-Chassis Nodes
vendid=0x8f1
devid=0x5a06
sysimgguid=0x5442ba00003000
switchguid=0x5442ba00003080(5442ba00003080)
Switch 24 "S-005442ba00003080" # "ISR9024 Voltaire" base port 0 lid 6 lmc 0
[22] "H-0008f10403961354"[1](8f10403961355) # "MT23108 InfiniHost Mellanox Technologies" lid 4 4xSDR
[10] "S-0008f10400410015"[1] # "SW-6IB4 Voltaire" lid 3 4xSDR
[8] "H-0008f10403960558"[2](8f1040396055a) # "MT23108 InfiniHost Mellanox Technologies" lid 14 4xSDR
[6] "S-0008f10400410015"[3] # "SW-6IB4 Voltaire" lid 3 4xSDR
[12] "H-0008f10403960558"[1](8f10403960559) # "MT23108 InfiniHost Mellanox Technologies" lid 10 4xSDR
vendid=0x8f1
devid=0x5a05
switchguid=0x8f10400410015(8f10400410015)
Switch 8 "S-0008f10400410015" # "SW-6IB4 Voltaire" base port 0 lid 3 lmc 0
[6] "H-0008f10403960984"[1](8f10403960985) # "MT23108 InfiniHost Mellanox Technologies" lid 16 4xSDR
[4] "H-005442b100004900"[1](5442b100004901) # "MT23108 InfiniHost Mellanox Technologies" lid 12 4xSDR
[1] "S-005442ba00003080"[10] # "ISR9024 Voltaire" lid 6 1xSDR
[3] "S-005442ba00003080"[6] # "ISR9024 Voltaire" lid 6 4xSDR
vendid=0x2c9
devid=0x5a44
caguid=0x8f10403960984
Ca 2 "H-0008f10403960984" # "MT23108 InfiniHost Mellanox Technologies"
[1](8f10403960985) "S-0008f10400410015"[6] # lid 16 lmc 1 "SW-6IB4 Voltaire" lid 3 4xSDR
vendid=0x2c9
devid=0x5a44
caguid=0x5442b100004900
Ca 2 "H-005442b100004900" # "MT23108 InfiniHost Mellanox Technologies"
[1](5442b100004901) "S-0008f10400410015"[4] # lid 12 lmc 1 "SW-6IB4 Voltaire" lid 3 4xSDR
vendid=0x2c9
devid=0x5a44
caguid=0x8f10403961354
Ca 2 "H-0008f10403961354" # "MT23108 InfiniHost Mellanox Technologies"
[1](8f10403961355) "S-005442ba00003080"[22] # lid 4 lmc 1 "ISR9024 Voltaire" lid 6 4xSDR
vendid=0x2c9
devid=0x5a44
caguid=0x8f10403960558
Ca 2 "H-0008f10403960558" # "MT23108 InfiniHost Mellanox Technologies"
[2](8f1040396055a) "S-005442ba00003080"[8] # lid 14 lmc 1 "ISR9024 Voltaire" lid 6 4xSDR
[1](8f10403960559) "S-005442ba00003080"[12] # lid 10 lmc 1 "ISR9024 Voltaire" lid 6 1xSDR
When grouping is used, IB nodes are organized into chassis which
are numbered. Nodes which cannot be determined to be in a chassis
are displayed as "Non-Chassis Nodes". External ports are also
shown on the connectivity lines.
Hal Rosenstock
< <[email protected]> >
Ira Weiny
< <[email protected]> >
This page is part of the rdma-core (RDMA Core Userspace Libraries
and Daemons) project. Information about the project can be found
at ⟨https://github.com/linux-rdma/rdma-core⟩. If you have a bug
report for this manual page, send it to
[email protected]. This page was obtained from the
project's upstream Git repository
⟨https://github.com/linux-rdma/rdma-core.git⟩ on 2025-08-11. (At
that time, the date of the most recent commit that was found in
the repository was 2025-08-04.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
[email protected]
2013-06-22 IBNETDISCOVER(8)
Pages that refer to this page: pmdaib(1), ibcacheedit(8), ibcheckerrors(8), ibchecknet(8), ibcheckstate(8), ibcheckwidth(8), ibclearcounters(8), ibclearerrors(8), ibdatacounters(8), ibdiscover(8), ibhosts(8), ibidsverify(8), ibnodes(8), ibrouters(8), ibswitches(8)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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