| .. |
| SPDX-FileCopyrightText: © 2020 Open Networking Foundation <support@opennetworking.org> |
| SPDX-License-Identifier: Apache-2.0 |
| |
| Troubleshooting |
| =============== |
| |
| Unknown MAC addresses |
| --------------------- |
| |
| Sometimes it's hard to find out all the MAC addresses assigned to network |
| cards. These can be found in a variety of ways: |
| |
| 1. On servers, the BMC webpage will list the built-in network card MAC |
| addresses. |
| |
| 2. If you login to a server, ``ip link`` or ``ip addr`` will show the MAC |
| address of each interface, including on add-in cards. |
| |
| 3. If you can login to a server but don't know the BMC IP or MAC address for |
| that server, you can find it with ``sudo ipmitool lan print``. |
| |
| 4. If you don't have a login to the server, but can get to the management |
| server, ``ip neighbor`` will show the arp table of MAC addresses known to |
| that system. It's output is unsorted - ``ip neigh | sort`` is easier to |
| read. |
| |
| Cabling issues |
| -------------- |
| |
| The system may not come up correctly if cabling isn't connected properly. |
| If you don't have hands-on with the cabling, here are some ways to check on the |
| cabling remotely: |
| |
| 1. On servers you can check which ports are connected with ``ip link show``:: |
| |
| $ ip link show |
| ... |
| 3: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000 |
| link/ether 3c:ec:ef:4d:55:a8 brd ff:ff:ff:ff:ff:ff |
| ... |
| 5: eno2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000 |
| link/ether 3c:ec:ef:4d:55:a9 brd ff:ff:ff:ff:ff:ff |
| |
| Ports that are up will show ``state UP`` |
| |
| 2. You can determine which remote ports are connected with LLDP, assuming that |
| the remote switch supports LLDP and has it enabled. This can be done with |
| ``networkctl lldp``, which shows both the name and the MAC address of the |
| connected switch on a per-link basis:: |
| |
| $ networkctl lldp |
| LINK CHASSIS ID SYSTEM NAME CAPS PORT ID PORT DESCRIPTION |
| eno1 10:4f:58:e7:d5:60 Aruba-2540-24…PP ..b........ 10 10 |
| eno2 10:4f:58:e7:d5:60 Aruba-2540-24…PP ..b........ 1 1 |