Physical Ports Missing from ip link show Output - switchd Failure
ip link show displays only the loopback and management (ethX) ports. Physical switch ports — the interfaces starting with
swp — are not visible to the operating system.
$ sudo ip link show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN mode DEFAULT link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000 link/ether 44:38:39:00:25:d7 brd ff:ff:ff:ff:ff:ff
- Cumulus Linux, all versions
switchd daemon sets up the physical ports. When
switchd fails to start, the physical ports are not visible to the operating system.
switchd fails to start when the Cumulus Linux license is missing.
If you installed your license and
switchd still fails to start, capture any errors that might occur and generate the
cl-support files, then send them to the NVIDIA support team.
Follow the appropriate steps below.
If the Cumulus Linux License Is not Installed
If you do not install a valid license, the physical ports cannot come up. Verify that you installed the license using the
$ sudo cl-license No license installed!
Contact the NVIDIA support team to obtain a license.
switchd Fails to Start with the Error: Syntax error parsing “thdi_input_port_xon_enables.xe0-xe127”
This error occurs when the port capacity configured on the switch exceeds the capability of the ASIC. Read the heading in the
/etc/cumulus/ports.conf file for details on how to configure the
ports.conf file. If the header is missing, run the
cl-img-clear-overlay command to restore the switch back to its original configuration. Make sure to remove the
/mnt/persist/etc/cumulus/ports.conf file if it exists.
Error: “No attached units. BDE found 0 switch devices.”
An error like this indicates the kernel cannot find the Broadcom ASIC. After you manually start the
switchd service using the
service switchd start command, check the
/var/log/switchd.log for the following error:
Platform: Cumulus_Networks_LLC OS: Unix (Posix) Boot flags: Cold boot No attached units. BDE found 0 switch device(s) 1421276331.445789 2014-01-11 10:33:51 hal.c:169 CRIT No backends found. 1421276331.445857 2014-01-11 10:33:51 switchd.c:632 Switchd exiting.
If you see the above error, confirm that the Broadcom ASIC is not seen by the kernel by running the
lspci -v command. Look for the following output:
01:00.0 Ethernet controller: Broadcom Corporation Device b850 (rev 03) Subsystem: Broadcom Corporation Device b850 Flags: bus master, fast devsel, latency 0, IRQ 21 Memory at ff600000 (64-bit, non-prefetchable) [size=256K] Capabilities:  Power Management version 3 Capabilities:  Vital Product Data Capabilities:  MSI: Enable- Count=1/1 Maskable- 64bit+ Capabilities: [ac] Express Endpoint, MSI 00 Kernel driver in use: linux-kernel-bde
If the above output is missing, replace the switch.
If switchd Fails to Start for Another Reason
Manually start the
switchd service using the
service switchd start command. You must have root/sudo access.
$ sudo service switchd restart can not execute decode-syseeprom .py", line 544, in check_output raise CalledProcessError(retcode, cmd, output=output) subprocess.CalledProcessError: Command '('/usr/cumulus/bin/decode-syseeprom', '-r')' returned non-zero exit status 1 -m requires a MAC address as an argument usage: /usr/sbin/switchd [-n] [-d] [-V] [-L BACKEND=LEVEL [BACKEND=LEVEL]] [-t TABLE_NUM] [-s]
If an error occurs:
- Save the entire error message.
- Download any Cumulus Linux support files. The support files are
- Open a case with Cumulus Support and upload the above information.