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MAC Address flapping – VXLAN with MLAG

Posted on March 27, 2019 by

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

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

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

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

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

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

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

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

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

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

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

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

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

 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

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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VXLAN on 7150 EOS version 4.16.7M

Posted on September 12, 2017 by

Hi, I’m trying to get VXLAN to work between 2 back to Arista 7150S. But it does not work.   SW1 and SW2 are directly connected via a l3 interco. Traffic is being generated from SW1- eth1 On both switch I have version 4.16.7M Here is my config : SW1 config : SW1(config)#sh run int e2,1interface Ethernet1   load-interval 5   switchport trunk allowed vlan 777   switchport mode trunk   no lldp transmit   spanning-tree bpdufilter disableinterface Ethernet2   load-interval 5   switchport mode dot1q-tunnel   no switchport   ip address 7.7.7.1/30   ip igmp version 2   ip pim sparse-mode   spanning-tree bpdufilter disableSW1(config)#sh run int vxlan 1interface Vxlan1   vxlan...
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VXLAN on 7150 EOS version 4.16.7M

Posted on September 11, 2017 by

Hi, I’m trying to get VXLAN to work between 2 back to Arista 7150S. But it does not work.   SW1 and SW2 are directly connected via a l3 interco. Traffic is being generated from SW1- eth1 On both switch I have version 4.16.7M Here is my config : SW1 config : SW1(config)#sh run int e2,1interface Ethernet1   load-interval 5   switchport trunk allowed vlan 777   switchport mode trunk   no lldp transmit   spanning-tree bpdufilter disableinterface Ethernet2   load-interval 5   switchport mode dot1q-tunnel   no switchport   ip address 7.7.7.1/30   ip igmp version 2   ip pim sparse-mode   spanning-tree bpdufilter disableSW1(config)#sh run int vxlan 1interface Vxlan1   vxlan...
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vEOS – Logical VTEP with MLAG – VXLAN interpreted on MLAG Peer

Posted on May 1, 2017 by

Hello all, Please see attached picture for network topolgy. I try to use VXLAN with HER for DCI, together with BGP&BFD as routing protocol (for underlay) between Site A and Site B.– Site A: VLAN100 mapped to DCI VNI 10100– Site B: VLAN1100 mapped to DCI VNI 10100– spine1&spine2 as mlag peers with logical VTEP– spine3 as single VTEP– ports for DCI configured as L3 routed (no switchport)– EBGP between spine1 and spine3 as well as spine2 and spine3– VLAN4093 between spine1 (10.0.1.1) and spine2 (10.0.1.2) for re-routing in case one DCI is down– IBGP between spine1 and spine2– target...
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Access to manuals

Posted on April 12, 2017 by

Hi there! Currently I’m doing some research in new data center networking technologies. I downloaded vEOS image and built basic topology using Unetlab. Now I want to configure EVPN, but I couldn’t find any manuals on it. For some reason this one – https://eos.arista.com/eos-4-18-1f/evpn-vxlan/ is protected. How can I get it?

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