The data network is primarily composed of the ToR ToR and the aggregation switches. The following component blocks make up this network:
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The data network is primarily composed of the ToR ToR and the aggregation switches. The following component blocks make up this network:
In order to create a highly-available solution, the network must be resilient to loss of a single network switch, NIC, or bad cable. To achieve this, the network configuration uses bonding across the servers and switches.
There are several types (or modes) of bonding, but only one is recommended for the solution. The , compute node s, Red Hat Ceph storage nodes, and Solution Admin Host (SAH) can use 802.3ad
or LACP (mode = 4).
balance-rr
(mode=0),
balance-xor
(mode=2),
broadcast
(mode=3),
balance-tlb
(mode=5), and
balance-alb
(mode=6), are not supported. Please check with your technician for current support status of
active-backup
(mode = 1).
All nodes' endpoints are terminated to switch ports that have been configured for LACP bonding mode across two S5232F-ON ToR switches for 25GbE/100GbE configured with a Virtual Link Trunking interconnect (VLTi) across them.
Please contact your Dell EMC sales representative for other viable options.
Node type | Bonding type |
Solution Admin Host (SAH) | 802.3ad (LACP mode 4) |
OpenStack controller nodes | Yes (solution default) |
OpenStack compute nodes | Yes (solution default) |
Red Hat Ceph storage nodes | Yes (solution default) |
OpenStack Hyper-Converged Infrastructure nodes | Yes (solution default) |
A single port is an option when bonding is not required. However, it is neither used nor validated in the Dell Technologies Reference Architecture for Red Hat OpenStack Platform . The need to eliminate single points of failure is taken into consideration as part of the design, and this option has been eliminated wherever possible.
Please contact your Dell EMC sales representative for other configurations.
Dell EMC ’s recommended architecture uses VLT for HA between the two Leaf switches, which enables the servers to terminate their Link Aggregation Group (LAG) interfaces (or bonds) into two different switches instead of one. This configuration enables active-active bandwidth utilization and provides redundancy within the rack if one Leaf switch fails or requires maintenance. Dell EMC recommended Leaf switch is 10/25/100GbE connectivity – S5232F-ON .
The Leaf switches are responsible for providing the different network connections such as tenant networks and storage networks between the compute, controller, and storage nodes of the OpenStack deployment.
The Reference Architecture Guide uses layer-2 as the reference up to the Leaf layer, which is why VLT is used on the Leaf switches.
The network links - Provisioning, Storage Clustering, Storage, and Management - can have uplinks to a gateway device. The Provisioning network can use the Red Hat OpenStack Director as a proxy for pulling packages from a subscription server, or a gateway can be added. The Red Hat Ceph storage , Dell EMC Unity , SC series storage or the Dell EMC PowerMax storage arrays on the may need access from metrics and monitoring tools to enable management and updates.
After you add the gateway to the network and update the iDRAC , you can use many tools for OOB management.
These are connected to a gateway device, usually a router or firewall. This device will handle routing for all networks external to the cluster. The required networks are:
This Reference Architecture Guide implements at a minimum nine (9) separate Layer 2 VLANs:
The management network and the provisioning network for all the servers and switches aggregate into a Dell EMC Networking S3048-ON switch.
The management network services are used for several functions:
In addition to the Dell EMC switch-based architecture, Dell EMC provides an open standard that enables you to choose other brands and configurations of switches for your OpenStack environment.
The following list of requirements will enable other brands of switches to properly operate with Dell EMC 's required tools and configurations: