---
name: "opashowmc"
section: "8"
platform: "linux"
package: "opa-fastfabric"
version: "10.10.3.0.11-1+b2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/opashowmc"
---

# opashowmc(8)

## NAME

opashowmc

**(Linux)** Displays the Intel(R) Omni-Path Multicast groups created for the fabric along with the Intel(R) Omni-Path Host Fabric Interface (HFI) ports which are a member of each multicast group. This command can be helpful when attempting to analyze or debug Intel(R) Omni-Path multicast usage by applications or ULPs such as IPoIB.

## Syntax

opashowmc \[-v\] \[-m  *mgid*\] \[-t  *portsfile*\] \[-p  *ports*\]

## Options

- \--help

  Produces full help text.

- \-v

  Returns verbose output and shows name of each member.

- \-m *mgid*

  Shows the membership of the group \<mgid\> only.

- \-t *portsfile*

  Specifies the file with list of local HFI ports used to access fabric(s) for analysis. Default is /etc/opa/ports file.

- \-p *ports*

  Specifies the list of local HFI ports used to access fabric(s) for analysis.

-

  Default is first active port. The first HFI in the system is 1. The first port on an HFI is 1. Uses the format hfi:port,\
   for example:

  - 0:0

    First active port in system.

  - 0:y

    Port *y* within system.

  - x:0

    First active port on HFI *x*.

  - x:y

    HFI *x*, port *y*.

## Examples

opashowmc\

opashowmc -p '1:1 1:2 2:1 2:2' opashowmc -m 0xff12401b80010000:0x00000000ffffffff

## Environment Variables

The following environment variables are also used by this command:

- **PORTS**

  List of ports, used in absence of -t and -p.

- **PORTS\_FILE**

  File containing list of ports, used in absence of -t and -p.