---
name: "ibccconfig"
section: "8"
platform: "linux"
package: "rdma-core"
version: "65.0-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/ibccconfig"
---

# ibccconfig(8)

configure congestion control settings

## Name

IBCCCONFIG - configure congestion control settings

## SYNOPSIS

ibccconfig \[common\_options\] \[-c cckey\] \<op\> \<lid\|guid\> \[port\]

## DESCRIPTION

**ibccconfig** supports the configuration of congestion control settings on switches and HCAs.

**WARNING -- You should understand what you are doing before using this tool.** **Misuse of this tool could result in a broken fabric.**

## OPTIONS

- **Current supported operations and their parameters:**

  CongestionKeyInfo (CK) \<lid\|guid\> \<cckey\> \<cckeyprotectbit\> \<cckeyleaseperiod\> \<cckeyviolations\> SwitchCongestionSetting (SS) \<lid\|guid\> \<controlmap\> \<victimmask\> \<creditmask\> \<threshold\> \<packetsize\> \<csthreshold\> \<csreturndelay\> \<markingrate\> SwitchPortCongestionSetting (SP) \<lid\|guid\> \<portnum\> \<valid\> \<control\_type\> \<threshold\> \<packet\_size\> \<cong\_parm\_marking\_rate\> CACongestionSetting (CS) \<lid\|guid\> \<port\_control\> \<control\_map\> \<ccti\_timer\> \<ccti\_increase\> \<trigger\_threshold\> \<ccti\_min\> CongestionControlTable (CT) \<lid\|guid\> \<cctilimit\> \<index\> \<cctentry\> \<cctentry\> ...

**--cckey, -c, \<cckey\>** Specify a congestion control (CC) key.  If none is specified, a key of 0 is used.

### 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.

### Addressing Flags

**-G, --Guid**     The address specified is a Port GUID

**-L, --Lid**   The address specified is a LID

**-s, --sm\_port \<smlid\>**     use 'smlid' as the target lid for SA queries.

### Port Selection flags

**-C, --Ca \<ca\_name\>**    use the specified ca\_name.

**-P, --Port \<ca\_port\>**    use the specified ca\_port.

- **-Y, --pkey-idx \<idx\>**

  P\_Key table index (0-65535, default 0) used for the outgoing SA/GMP MADs. SMP (SMI directed-route/LID-routed) MADs always use P\_Key index 0.

### 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

- **-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.

**--config, -z  \<config\_file\>** Specify alternate config file.

Default: /etc/infiniband-diags/ibdiag.conf

## EXAMPLES

```
ibccconfig SwitchCongestionSetting 2 0x1F 0x1FFFFFFFFF 0x0 0xF 8 0 0:0 1  # Configure Switch Congestion Settings
ibccconfig CACongestionSetting 1 0 0x3 150 1 0 0                          # Configure CA Congestion Settings to SL 0 and SL 1
ibccconfig CACongestionSetting 1 0 0x4 200 1 0 0                          # Configure CA Congestion Settings to SL 2
ibccconfig CongestionControlTable 1 63 0 0:0 0:1 ...                      # Configure first block of Congestion Control Table
ibccconfig CongestionControlTable 1 127 0 0:64 0:65 ...                   # Configure second block of Congestion Control Table
```

## FILES

### CONFIG FILE

/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.

## AUTHOR

- **Albert Chu**

  \< \<chu11@llnl.gov\> \>