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The VXLAN protocol

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3.1 The VXLAN protocol VXLAN allows a Layer 2 network to scale across the data center by overlaying an existing Layer 3 network and is described in Internet Engineering Task Force document RFC 7348. Each overlay is referred to as a VXLAN segment. Each segment is identified through a 24-bit segment ID referred to as a VNI. This allows up to 16 Million VNIs, far more than the traditional 4,094 VLAN IDs allowed on a physical switch. VXLAN is a tunneling scheme that encapsulates Layer 2 frames in User Datagram Protocol (UDP) segments, as shown in Figure 7. VXLAN encapsulated frame VXLAN encapsulation adds approximately 50 bytes of overhead to each Ethernet frame. As a result, all switches in the underlay (physical) network must be configured to support an MTU of at least 1600 bytes on all participating interfaces. Note: In this deployment example, switch interfaces are set to their maximum supported MTU size of 9216 bytes. VTEPs handle VXLAN encapsulation and de-encapsulation. In this implementation, the leaf switches are the VTEPs. 10 Dell EMC Networking Virtualization Overlay with BGP EVPN

Section	Page
1 Introduction	6
1.1 Typographical conventions	6
1.2 Attachments	6
2 Hardware Overview	7
2.1 Dell EMC PowerSwitch S5248F-ON	7
2.2 Dell EMC PowerSwitch S4148U-ON	7
2.3 Dell EMC PowerSwitch Z9264F-ON	8
2.4 Dell EMC PowerSwitch S3048-ON	8
2.5 Dell EMC PowerEdge R740xd server	8
3 BGP EVPN VXLAN overview	9
3.1 The VXLAN protocol	10
3.2 BGP EVPN VXLAN operation	11
3.3 Integrated routing and bridging (IRB)	11
3.4 Anycast gateway	11
3.5 Indirect gateway	11
4 Topology	12
4.1 Leaf-spine underlay	12
4.1.1 BGP ASNs and router IDs	13
4.1.2 Point-to-point IP networks	13
4.2 Underlay network connections	15
4.3 BGP EVPN VXLAN overlay	16
4.4 OOB management network connections	17
5 Switch preparation	19
5.1 Check switch OS version	19
5.2 Verify license installation	19
5.3 Factory default configuration	20
5.4 Configure switch port profile (S4148U-ON only)	20
6 Configure leaf switches	21
6.1 Initial configuration settings	21
6.2 VLT configuration	22
6.3 Virtual network configuration	22
6.4 VLAN configuration	24
6.5 Downstream interface configuration	25
6.6 Upstream interface configuration	26
6.7 Route map configuration	26
6.8 Configure UFD in reverse	27
6.9 BGP configuration	28
6.10 Static route configuration	30
7 Configure spine switches	31
7.1 Initial configuration settings	31
7.2 Downstream interface configuration	31
7.3 Route map configuration	33
7.4 BGP configuration	33
8 Leaf switch validation	37
8.1 General commands	37
8.1.1 show interface status	37
8.1.2 show vlan	37
8.1.3 show lldp neighbors	38
8.1.4 show uplink-state-group id_# detail	38
8.2 VLT validation commands	39
8.2.1 show vlt domain_id	39
8.2.2 show vlt domain_id backup-link	39
8.2.3 show vlt domain_id mismatch	39
8.2.4 show vlt domain_id vlt-port-detail	40
8.3 Routing validation commands	41
8.3.1 show bfd neighbors	41
8.3.2 show ip route	41
8.3.3 show ip bgp summary	42
8.4 EVPN validation commands	42
8.4.1 show ip route vrf vrf_name	42
8.4.2 show evpn evi	42
8.4.3 show ip bgp l2vpn evpn summary	43
8.4.4 show ip bgp l2vpn evpn	43
8.4.5 show evpn mac-ip	45
9 Spine switch validation	46
9.1 General commands	46
9.1.1 show interface status	46
9.1.2 show lldp neighbors	46
9.2 Routing validation commands	47
9.2.1 show bfd neighbors	47
9.2.2 show ip route	47
9.2.3 show ip bgp summary	48
9.2.4 show ip bgp l2vpn evpn summary	48
10 VMware host and network configuration	49
10.1 VMware ESXi download and installation	49
10.2 Install and configure VMware vCenter Server 6.7 U1	49
10.3 Add ESXi hosts to vCenter Server	49
10.4 Create VMs and install guest operating systems	50
10.5 vSphere distributed switches	51
10.6 Create a VDS	51
10.7 Add distributed port groups	52
10.8 Create LACP LAGs	52
10.9 Associate hosts and assign uplinks to LAGs	54
10.10 Connect VMs to VDS and port group	56
10.11 Configure networking in the guest OS	57
11 Validate connectivity	58
11.1 Validate tunneled Layer 2 bridging	58
11.2 Validate routing using anycast gateways	59
11.3 Validate routing using the indirect gateway	60
A Gateway/firewall switch configuration	62
A.1 Initial configuration settings	62
A.2 Indirect gateway configuration	62
A.3 Simulated external network interface configuration	63
A.4 Upstream interfaces	63
A.5 Static routes to VNIs	63
B Validated components	64
B.1 Dell EMC PowerSwitches	64
B.2 PowerEdge R740xd Servers	64
B.3 VMware software	64
C Technical resources	65
C.1 Dell EMC product manuals and technical guides	65
C.1 VMware product manuals and technical guides	65
D Fabric Design Center	66

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Dell EMC Networking Virtualization Overlay with BGP EVPN

3.1

The VXLAN protocol

VXLAN allows a Layer 2 network to scale across the data center by overlaying an existing Layer 3 network

and is described in Internet Engineering Task Force document

RFC 7348

. Each overlay is referred to as a

VXLAN segment.

Each segment is identified through a 24-bit segment ID referred to as a VNI. This allows up to 16 Million VNIs,

far more than the traditional 4,094 VLAN IDs allowed on a physical switch.

VXLAN is a tunneling scheme that encapsulates Layer 2 frames in User Datagram Protocol (UDP) segments,

as shown in Figure 7.

VXLAN encapsulated frame

VXLAN encapsulation adds approximately 50 bytes of overhead to each Ethernet frame. As a result, all

switches in the underlay (physical) network must be configured to support an MTU of at least 1600 bytes on

all participating interfaces.

Note:

In this deployment example, switch interfaces are set to their maximum supported MTU size of 9216

bytes.

VTEPs handle VXLAN encapsulation and de-encapsulation. In this implementation, the leaf switches are the

VTEPs.