Infiniband Poiint to Point Conection RHEL/Centos


here the content of this issue again.

Two Servers with two mellanox 5 infiniband cards. connected together with a DA Cable MCP1600

CentOS Linux release 7.6.1810 (Core)

MLNX_OFED_LINUX-4.5- installed

CA ‘mlx5_1’

CA type: MT4119

Number of ports: 1

Firmware version: 16.24.1000

Hardware version: 0

Node GUID: 0x98039b0300164ea2

System image GUID: 0x98039b0300164ea2

Port 1:

State: Down

Physical state: Disabled

Rate: 10

Base lid: 65535

LMC: 0

SM lid: 0

Capability mask: 0x2651e848

Port GUID: 0x98039b0300164ea2

Link layer: InfiniBand

Problem State: Down, Physical state: Disabled.

When i switch to Ethernet Mode it works. Infiniband not.

ip link show ib0 up

6: ib0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 4092 qdisc mq state DOWN mode DEFAULT group default qlen 256

link/infiniband 20:00:08:57:fe:80:00:00:00:00:00:00:98:03:9b:03:00:16:4e:a2 brd 00:ff:ff:ff:ff:12:40:1b:ff:ff:00:00:00:00:00:00:ff:ff:ff:ff

if i try to enable

ibportstate -L 0x0 enable

ibwarn: [21618] mad_rpc_open_port: can’t open UMAD port ((null):0)

ibportstate: iberror: failed: Failed to open ‘(null)’ port ‘0’