This knowledge base has moved to the documentation site. Please visit the knowledge base here for the most up to date content. This site is no longer maintained.

brctl showstp Shows Carrier Down Ports as Blocking



brctl showstp shows ports that are admin up/carrier down as blocking:

cumulus@switch$ sudo brctl show bridge
bridge  name bridge id     STP enabled  interfaces
bridge  8000.c45444bcfc8a  yes          swp1
cumulus@switch$ ip l sh swp1
28: swp1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast master bridge state DOWN mode DEFAULT qlen 500 
link/ether c4:54:44:bc:fc:8a brd ff:ff:ff:ff:ff:ff
 cumulus@switch$ sudo brctl showstp bridge
 swp1 (1)
 port id 8001 state blocking


  • Cumulus Linux, all versions


Use mstpctl showportdetail BRIDGE PORT, which more accurately reflects the port state as Disabled/discarding.

cumulus@switch$ sudo mstpctl showportdetail bridge swp1
 CIST info enabled no role Disabled
 port id 8.001 state discarding


This support portal has moved

Cumulus Networks is now part of the NVIDIA Networking Business Unit! The NVIDIA Cumulus Global Support Services (GSS) team has merged its operations with the NVIDIA Mellanox support services team.

You can access NVIDIA Cumulus support content from the Mellanox support portal.

You open and update new cases on the Mellanox support portal. Any previous cases that have been closed have been migrated to the Mellanox support portal.

Cases that are still open on the Cumulus portal will continue to be managed on the Cumulus portal. Once these cases close, they will be moved to the Mellanox support portal.

Powered by Zendesk