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Layer 3 leaf-spine topology, Scaling out the existing networking topology

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4.4 Scaling out the existing networking topology Layer 3 leaf-spine topology In a layer 3 leaf-spine network, traffic between leafs and spines is routed. The layer 2/3 boundary is at the leaf switches. Spine switches are never connected to each other in a layer 3 topology. Equal cost multi-path routing (ECMP) is used to load balance traffic across the layer 3 network. Connections within racks from hosts to leaf switches are layer 2. Connections to external networks are made from a pair of edge or border leafs as shown in Figure 12. Layer 3 leaf-spine network 14 Dell EMC Networking with Isilon Front-End Deployment and Best Practices Guide | version 1.0

Section	Page
1 Introduction	5
1.1 Typographical conventions	7
1.2 Attachments	7
2 Hardware overview	8
2.1 Dell EMC Networking S3048-ON	8
2.2 Dell EMC Networking S4048-ON	8
2.3 Dell EMC Networking Z9100-ON	8
2.4 Dell EMC PowerEdge R730xd	8
2.5 Dell EMC PowerEdge R640	9
2.6 Isilon X210	9
3 Management	10
4 Leaf-spine overview	11
4.1 Design considerations	11
4.2 Oversubscription	12
4.3 Scaling	13
4.4 Layer 3 leaf-spine topology	14
4.5 Layer 2 leaf-spine topology	15
5 Layer 3 Topology preparation	16
5.1 BGP ASN configuration	16
5.2 Loopback addresses	16
5.3 Point-to-point interfaces	17
6 Configuration of Layer 3 Topology	19
6.1 Configuration of Z9100-ON OS10EE Spine Switches	19
6.2 Configuration of S4048-ON OS10EE Leaf Switches	23
6.3 Configuration of S4048-ON OS9 Leaf Switches	32
7 Configuration of Layer 2 Topology	41
7.1 Configuration of Z9100-ON OS10EE Spine Switches	41
7.2 Configuration of S4048-ON OS10EE Leaf Switches	45
7.3 Configuration of S4048-ON OS9 Leaf Switches	50
8 Validation	58
8.1 OS10EE Validation commands	58
8.1.1 show ip bgp summary	58
8.1.2 show ip route bgp	58
8.1.3 Show VLT	60
8.1.4 Show VLT backup-link	60
8.1.5 Show vlt-port-detail	60
8.1.6 Show VLT mismatch	61
8.1.7 Show uplink-state-group	61
8.1.8 Show spanning-tree brief	62
8.1.9 Show vrrp brief	63
8.2 OS9 Validation commands	63
8.2.1 show ip bgp summary	63
8.2.2 show ip route bgp	63
8.2.3 Show VLT brief	64
8.2.4 Show VLT detail	65
8.2.5 Show VLT mismatch	65
8.2.6 Show uplink-state-group	65
8.2.7 Show spanning-tree rstp brief	65
8.2.8 Show vrrp brief	66
9 Isilon configuration	67
9.1 Building the cluster	67
9.2 Configuring LACP to each node	69
9.3 Configuring SMB share	72
9.4 Setting up DNS for SmartConnect	73
9.5 Validation	74
A Validated hardware and components	76
A.1 Dell EMC Networking Switches	76
A.2 Dell EMC Isilon Array	76
A.3 Dell EMC PowerEdge Servers	76
B Product Manuals and technical guides	77

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Dell EMC Networking with Isilon Front-End Deployment and Best Practices Guide | version 1.0

Scaling out the existing networking topology

4.4

Layer 3 leaf-spine topology

In a layer 3 leaf-spine network, traffic between leafs and spines is routed. The layer 2/3 boundary is at the leaf

switches. Spine switches are never connected to each other in a layer 3 topology. Equal cost multi-path

routing (ECMP) is used to load balance traffic across the layer 3 network. Connections within racks from

hosts to leaf switches are layer 2. Connections to external networks are made from a pair of edge or border

leafs as shown in Figure 12.

Layer 3 leaf-spine network