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EVPN VXLAN All-Active Multihoming

Posted on June 17, 2019 by   |   144 Views

Description Ethernet VPN (EVPN) networks normally require some measure of redundancy to reduce or eliminate the impact of outages and maintenance. RFC7432 describes four types of route to be exchanged through EVPN, with a built-in multihoming mechanism for redundancy. Prior to EOS 4.22.0F, MLAG is available as a redundancy option for EVPN with VXLAN, but not multihoming. EVPN multihoming is a multi-vendor standards-based redundancy solution that does not require a dedicated peer link and allows for more flexible configurations than MLAG, supporting peering on a per interface level rather than a per device level. It also supports a mass withdrawal mechanism...
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EVPN VxLAN IPV6 Overlay TOI

Posted on June 14, 2019 by   |   59 Views

Description Starting with EOS release 4.22.0F, the EVPN VXLAN L3 Gateway using EVPN IRB supports routing traffic from IPV6 host to another IPV6 host on a stretched Vxlan VLAN.  This TOI explains the EOS configuration and show commands. Platform compatibility Platform Supporting ND Proxy and ND Suppression DCS-7280R/7280R2 DCS-7050CX3-32S-F DCS-7050SX3-48YC12-F Platform Compatibility (No ND Proxy, No ND Suppression) DCS-7020R DCS-7260X/7260X3 DCS-7050/7050X/7050X2 DCS-7060X/7060X2 DCS-7160 DCS-7250 DCS-7500R/7500R2/7500E DCS-7300X/DCS-7320X Configuration Enable IPv6 Routing First, enable global IPv6 unicast routing.  Then enable IPv6 unicast routing for each VRF. hs482(config)#ipv6 unicast-routing hs482(config)#ipv6 unicast-routing vrf tenant-c Virtual Router MAC (config-t)#ip virtual-router mac-address <mac> IPV6 SVI If...
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VxLAN troubleshooting guide

Posted on May 29, 2019 by   |   322 Views

VxLAN Basic Troubleshooting Guide I. Objective Provide basic/generic troubleshooting steps to customers in case any VxLAN issue is encountered in their network. II. Introduction: Troubleshooting VxLAN involves few steps as mentioned in the upcoming sections of this document. The below referred topology includes VxLAN configurations with server 1,2,3 as the host devices which obtain connectivity over a vxlan tunnel. Troubleshooting steps are bifurcated into routing and bridging to include multiple scenarios possible.   III. Topology   IV. Generic Configurations to be checked A. On the VTEPS check for the following configurations: #show run sec vxlan interface Vxlan1 vxlan source-interface Loopback1...
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BGP Crashing with VXLAN EVPN

Posted on May 24, 2019 by   |   0 Views

I have a network setup with 6 Arista 7050QX running VXLAN-EVPN. All nodes are doing eBGP. I can establish eBGP sessions and configure EVPN as well but the moment I start sending traffic via VXLAN then BGP stops working saying “BGP agent not running”. I have tried 4.21.5F, 4.21.3F and currently using 4.20.5F but same result. Config looks like this at one end. Router bgp 65001 vlan 101 rd 10.61.0.7:101 route-target both 101:10000002 redistribute learned interface Vxlan1 description VXLAN Interface vxlan source-interface Loopback0 vxlan udp-port 4789 vxlan vlan 100 vni 10000001 vxlan vlan 101 vni 10000002 Arista DCS-7050QX-32-R Hardware version:...
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MAC Address flapping – VXLAN with MLAG

Posted on March 27, 2019 by   |   0 Views

As per the attached diagram, its a VXLAN EVPN setup. Everything was working fine on that side. Both switches in city A and City B have MLAG configured with the TOR Stack switches. After creating MLAG with the TOR Stack switches, all MAC addresses have started flapping. For example MAC address ab-bc-cd is coming from the server connected to TOR Stack switch in City B. On B-SW01 it is learning from Port-channel10 (MLAG) but on B-SW02 it is learning from VX1 interface (vxlan) which is coming from the RR via B-SW01 and then it hands it back to the TOR...
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EVPN MLAG Shared Router MAC

Posted on January 23, 2019 by   |   103 Views

Description “MLAG Domain Shared Router MAC” is a new mechanism to introduce a new router MAC to be used for MLAG TOR Leaf pairs.  The user can have either explicitly configured MAC address of their choice or use the system generated MLAG system-id for this purpose.   When the MLAG shared MAC is set as the MLAG system ID value, the new shared MAC has the following properties: Unlike the bridge MAC which is different on each peer, this MLAG Domain shared router MAC has the same exact value on MLAG peers forming the same MLAG domain. This new shared...
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VXLAN Static and EVPN Dual Configuration

Posted on January 17, 2019 by   |   75 Views

Description Configuration of VXLAN overlay using EVPN allows for extension of Layer-2 (L2) or Layer-3 (L3) networks across multiple data centers. VXLAN is configured on Provider Edge (PE) switches to create an overlay network to tunnel customer traffic between networks connected to the PE switches, while EVPN acts as the control plane by advertising reachability amongst the PE switches via EVPN route types 1-5. In some scenarios, one or more of the PE switches facing the customer network may not support EVPN. For example, the PE switch may be a Linux-based software VTEP (VXLAN Tunnel End-Point) running on a server...
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Layer 2 Data Center Interconnect – Reference Designs

Posted on December 27, 2018 by   |   1976 Views

Introduction VxLAN is a popular choice for extending Layer 2 both intra and inter DC using overlays. Arista offers multiple control plane choices for VxLAN: Static HER, CVX and EVPN. In this article, two approaches to designing a L2 DCI over a L3 underlay are discussed. High-level technical details of each design approach is described first, followed by a comparison of the two options along with their typical use cases. Design 1: Multi-domain Overlay In this design, two overlay domains are identified: DC Fabric domain: This is the VxLAN domain within the DC Layer 3 Leaf-Spine Fabric with Leafs acting...
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EVPN VXLAN Design Guide

Posted on August 6, 2018 by   |   4408 Views

A Detailed Overview of the EVPN & VxLAN Protocols, Route Types, Use-Cases and Architectures 1. Introduction This document describes the operation and configuration of BGP EVPN Services over a VXLAN (Virtual eXtensible LAN) overlay on Arista platforms. The focus in this design guide is VxLAN as the protocol for the data-plane encapsulation for the overlay tunnels, and the functionality of the Multiprotocol BGP (MP-BGP) EVPN address-family for control plane signaling in the overlay.  MP-BGP EVPN is not only used for advertising MAC addresses, MAC and IP bindings and IP prefixes across the overlay; it provides efficiencies in the way learning...
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Arista Layer 2 VTEP EVPN VxLAN Route Type-1 Support

Posted on August 6, 2018 by   |   875 Views

Arista Layer 2 VTEP EVPN Route Type-1 Support   Arista Layer 2 EVPN VTEP Inter-Operation With A/A Multi-homed Third-Party Layer 3 EVPN VXLAN VTEPs   Introduction   This document will explain the configurations required to support inter-working with EVPN VXLAN A/A multi-homed VTEPs, also known as L2 ECMP in VxLAN EVPN.   Currently, EOS uses MLAG is used to achieve Multi-homing in EVPN VxLAN Topologies, with an any-cast VxLAN VTEP configured on the MLAG pair, and as such does not need to support EVPN Multihoming Tx (Type-1 route generation). EOS can however install received Type-1 routes and can...
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Multi-Tenant EVPN VXLAN IRB Configuration & Verification Guide (iBGP Overlay eBGP Underlay)

Posted on August 6, 2018 by   |   1219 Views

Multi-Tenant EVPN VXLAN IRB Configuration & Verification Guide   Symmetric and Asymmetric IRB With VLAN Based and VLAN Aware Bundle Services Using an iBGP Overlay and eBGP Underlay Topology Logical Diagrams Tenant-A: Symmetric IRB Tenant-B: Asymmetric IRB Platform Support: https://www.arista.com/en/support/product-documentation/supported-features Topology Overview   In the symmetric and asymmetric IRB setups illustrated in the figures above;  for tenant-a four subnets are stretched across the two MLAG domains; with two subnets (vlan 10 – 10.10.10.0/24 and vlan 11 – 10.10.11.0/24) configured as a VLAN based service, and two other subnets (vlan 12 – 10.10.12.0/24 and vlan 13 – 10.10.13.0/24) as a vlan-aware...
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Multi-Tenant EVPN VXLAN IRB Configuration & Verification Guide (eBGP Overlay & Underlay)

Posted on August 6, 2018 by   |   1508 Views

Multi-Tenant EVPN VXLAN IRB Configuration & Verification Guide   Symmetric and Asymmetric IRB With VLAN Based and VLAN Aware Bundle Services Using an eBGP Overlay and eBGP Underlay Topology Logical Diagrams Tenant-A: Symmetric IRB Tenant-B: Asymmetric IRB Platform Support: https://www.arista.com/en/support/product-documentation/supported-features Topology Overview   In the symmetric and asymmetric IRB setups illustrated in the figures above;  for tenant-a four subnets are stretched across the two MLAG domains; with two subnets (vlan 10 – 10.10.10.0/24 and vlan 11 – 10.10.11.0/24) configured as a VLAN based service, and two other subnets (vlan 12 – 10.10.12.0/24 and vlan 13 – 10.10.13.0/24) as a vlan-aware...
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L3 EVPN VXLAN Configuration Guide

Posted on August 6, 2018 by   |   1757 Views

L3 EVPN VXLAN Configuration Guide   EVPN VXLAN Type-5 Layer 3 VPN  (With Dual-Homed Layer 2 and Layer 3 Sites) Overview Ethernet VPN (EVPN) is an extension of the BGP protocol introducing a new address family: L2VPN (address family number 25) / EVPN (subsequent address family number 70). It is used to exchange overlay MAC and IP address reachability information between BGP peers using type-2 routes, but additionally,  EVPN supports the exchange of layer 3 IPv4 and IPv6 overlay routes through the extensions described in (type 5 EVPN routes). An IP VRF is used on a VTEP router for...
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How does vxlan traffic flow from outside into the vxlan

Posted on May 23, 2018 by   |   0 Views

Hi I understand how vxlan direct routing works from the vxlan perspective. The only thing I cannot grasp my head around is how does the traffic flow from ping for 172.10.10.50 from OUTSIDE DATACENTER -> SPINE eBGP-> multiple different LEAF MLAG VXLAN PAIR with different VTEP ex: 172.0.0.200 vtep 1, 172.0.0.201 vtep 2 -> server 172.10.10.50 connected to vtep 1 pair. vARP on all pairs advertising 172.10.10.1 as the default gateway. Once it comes into the spine how does the spine forward traffic to the get to the server ip addresses? Does it go through one of the vtep ip’s...
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Spine-Leaf BGP EVPN Best Practice

Posted on March 30, 2018 by   |   0 Views

Hello I’m seeking for a white paper\best practice document that can cover deploying a topology of spine-leaf data center. The points i’m seeking clarifications are 1. underlay L3 connectivity – is IGP required to be configured between spine and leafs. 2. is multicast a must between spine and leaf for control plan operation? (forwarding BUM packets?) 3. with vxlan, are there any problems using mlags? how can i advertise a certain MAC address is available from two different VTEPs and encapsulate into vxlan from both connections? 4. in terms of configuration, how can i deploy such a scenario? 5. unconventional as it...
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vEOS on ESXi – Jumbo MTU Problem

Posted on March 30, 2018 by   |   0 Views

Hi, I run couples of latest vEOS switches on ESXi, trying to build a VXLAN lab to test. Between vEOS switches, I used standard virtual switch as a virtual cable for each individual connection.  In vSwitch settings, I’ve set the MTU to 9000. MTU1500 works OK. But ping test over 1500 bytes all failed. PING 172.16.11.0 (172.16.11.0) 1473(1501) bytes of data. ping: sendmsg: Network is unreachable ping: sendmsg: Network is unreachable ping: sendmsg: Network is unreachable Searching over Internet came up no result…. Any thought?  

How to recover flood-list and mac address learning when using OVSDB management

Posted on January 29, 2018 by   |   0 Views

Hi, I am a beginner of Arista switch. I have two questions on that. <Information of the switch>model:Arista DCS-7150S-64-CLversion:EOS-4.15.7M 1) The flood-list and the mac address  learning disappears when the switch restarts. Why? I set the infomation that “HER flood-list and mac address learning” on the Arista switch that using the OVSDB management. Example of setting  is as follows.(The following command executed on CVX.)-bash-4.1# vtep-ctl add-mcast-remote <LS-name> unknown-dst vxlan_over_ipv4 <vtep-ip>-bash-4.1# vtep-ctl add-ucast-remote  <LS-name>  <MAC-address> vxlan_over_ipv4 <vtep-ip> One day, I stopped the Arista switch and started it.Then, the information(HER flood-list and mac address  learning) disappeared from Arista switch…Note: I confirmed it by...
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Multicast in VXLAN with BGP EVPN control-plane

Posted on December 14, 2017 by   |   0 Views

 Hello, We are trying to run multicast in data center overlay network. In our data centers we are using L3 leaf-spine topology with VXLAN. For the control plane BGP EVPN is used.  Leaf switches are deployed in an MLAG configuration. We want to run multicast between hosts that are on same vlan across switches in different MLAG domains. Multiple multicast receivers, as well as multiple senders are connected to different MLAG domains and are all in the same VLAN. Multicast receiver can receive m-c stream from the sender if both of them are in the same MLAG domain. But if receiver is connected to...
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EVPN Configuration – Layer 2 EVPN design with Type-2 routes

Posted on October 26, 2017 by   |   4250 Views

Introduction This document describes the operation and configuration of BGP EVPN with a VXLAN forwarding plane, for the construction of multi-tenant Layer 2 networks, termed L2VPNs within this document, over a layer 3 leaf-spine network. The configuration and guidance within the document unless specifically noted are based on the platforms and EOS releases noted in the table below Platform Software Release 7050X Series EOS release 4.18.1 7050X2 series EOS release 4.18.1 7060X Series EOS release 4.18.1 7160 series EOS release 4.18.1 7280R/7500R EOS release 4.18.1 Leaf spine underlay architecture EVPN with a VXLAN forwarding plane provides the ability to decouple...
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