• Tag : VXLAN


Problem with CVX EVPN and other vendor

Hi! I have full Arista VXLAN network with CVX as a controller with “service vxlan” and BGP EVPN between different CVX for DCI. Now I need to interconnect another vendor leaf switches to CVX via BGP EVPN. And got a problem. When I recive mac-ip route from other CVX via EVPN, then advertise this route to “service vxlan” is great work, but when I recive mac-ip route from other vendors then this route don’t advertise to “service vxlan”. Route wich I recive from other CVX and work: CVX-1(config)#show bgp neighbors evpn received-routes route-type mac-ip fa16.3e6b.aa20 detail BGP routing table...
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VXLAN Decapsulation on default VRF Only

Description Current VXLAN decapsulation logic requires the following hits on affected switches listed in the following paragraph: Outer VXLAN header DMAC = bridgemac. Outer VXLAN header UDP port = VXLAN udp port. Outer VXLAN header DIP = VTEP IP. VNI on Outer VXLAN header is configured on the VTEP. The current decapsulation logic does not consider the VRF of the interface the packet came in on. This has led to security issues such as Security Advisory 0055. The fix for SA55 was to simply disable VXLAN decapsulation on an interface if it could receive any non-default VRF traffic. This however...
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output of show ip route vrf xyz in vxlan

( ISP | bl1—-bl2(static 0/0) |   /   \  | sp1       sp2 |   /   \  | lf1   Hi , In my setup I have 2 bl and 1 lf as shown above. my quesiton is simple . 2 bl has a virtual vtep ISP advertise 0/0 to bl1 in vrf xyz via BGP. bl2 has a static 0/0 and redistribute to bgp too lf1#show ip route vrf  xyz 0/0 detail B E [200/0] via   VTEP      VNI1000 router-mac xxxxxxxxx via   VTEP       VNI 1000 router-mac xxxxxxxxx   static redistribute and ebgp are...
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Need some guidance on multicast implementation where we need to enable for video streams. Standard Spine and Leaf setup with multiple vlans both receivers and source are located in Vlan 10 at different location/vtep enabled igmp snooping + querier on all vtep receiver located at different vtep from the source are not receiving any stream Trying to find documentation on what i may missed or if any experts can provide any clues.  


Description A private VLAN partitions the Layer 2 broadcast domain of a VLAN into subdomains. It allows isolating the ports on the switch from each other. A subdomain consists of a primary VLAN and one or more secondary VLANs (Private vlans). All secondary VLAN share the same primary VLAN. The secondary VLAN ID differentiates one subdomain from another. The secondary VLANs may either be isolated VLANs or community VLANs. VxLAN with EVPN is used to extend the PVLAN domain to remote locations. Types of VLANs We use below terminologies to describe the type of VLANs in PVLAN domain. Primary VLAN:...
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Multi-Domain EVPN VXLAN

Description This feature provides the ability to interconnect EVPN VXLAN domains. Domains may or may not be within the same data center network, and the decision to stretch/interconnect a subnet between domains is configurable. The following diagram shows a multi-domain deployment using symmetric IRB. Note that two domains are shown for simplicity, but this solution supports any number of domains. Within domain #1 and domain #2, VTEPs exchange EVPN reachability as normal. Between domains, gateway nodes advertise intra-domain EVPN routes with the gateway inserting itself as the nexthop. From the perspective of a gateway node, there is the local EVPN...
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EVPN border leaf design

I have 4 leaf ,2 border leaf ,2 routers as below. There are 3 VRFs in  leaf1-4. r1/r2 advertise default route 0/0 to bl1/2. what vrf should I put gi1 in bl1/2? Should I create 3 vrfs in bl1/2 too? or create the 4th vrf? I want to advertise 0/0 to all vrfs so leaf1-4 know how to reach internet. leaf1———– | leaf2———–|spine1———– bl1 gi1———–r1 leaf3———–|spine2———– -bl2 gi1———–r2 leaf4———–|  

MP-BGP: EVPN is connect state

hey folks, My EVPN is not working through spine switches: leaf1p1#show bgp evpn summary BGP summary information for VRF default Router identifier, local AS number 65055 Neighbor Status Codes: m – Under maintenance Description Neighbor V AS MsgRcvd MsgSent InQ OutQ Up/Down State PfxRcd PfxAcc spine1 4 65000 0 0 0 0 2d06h Connect spine2 4 65000 0 0 0 0 2d06h Connect what could be the issue? Thanks, Omkar


Hi, We have a requirement to extend an isolated PVLAN over the EVPN fabric with Centralized GWs. We wanted to understand what are the best options to block peer to peer communication over EVPN with a centralized GW fabric. I read some previous posts to the forum, but could not validate whether or not PVLAN isolation over VXLAN w/ Centralized Gateway is supported? Can someone confirm? I don’t want to go down to far into a rabbit hole.   Thanks.

Dual Stack Underlay Support for VXLAN with EVPN Control Plane

Description This feature allows a Data Center (DC) operator to incrementally migrate their VXLAN network from IPv4 to IPv6 underlay when using the EVPN control plane. It is meant for brownfield deployments where operators are considering transitioning their VXLAN network to IPv6 underlay but do not want to migrate their whole network at the same time. This feature allows them to migrate parts of their network to IPv6 and leave the rest of the network untouched, without any overlay network partitioning. The incremental transition is achieved using the concept of a dual-stack VTEP.  Dual Stack VTEPs and incremental migration A...
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VxLAN DSCP Mapping

Description This feature allows selecting Differentiated Services Code Point ( DSCP ) and Traffic Class ( TC ) values for packets at VTEPs ( VxLAN Tunnel Endpoint) along VxLan encapsulation and decapsulation directions respectively.  DSCP is a field in IP Header and TC is a tag associated with a packet within the switch, both influence the Quality of Service the packet receives. This feature can be enabled via configuration as explained later in this document. In the encapsulation direction, an incoming packet from an edge port is encapsulated with a new IP and VxLan header before being sent out to...
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Support BGP PIC edge for EVPN VXLAN routes for remote VTEP failures

Description Prior to 4.25.2F, support for BGP PIC was restricted to locally identifiable failures such as link failures. If a remote VTEP went down, this would require action by the IGP and BGP to recompute a new best path traffic destined to affected BGP prefixes originally reachable by the problematic VTEP. This feature introduces support for RFC8971 (BFD for VXLAN) for EVPN learned VTEPs to improve convergence times in these scenarios by tying the liveness detection provided by the BFD sessions into existing BGP PIC support for software fast-failover. Without this feature, until the underlay route providing reachability to the...
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Arista Fabric Integration with Microsoft Network Load Balancing

Overview This article provides a brief introduction and configuration of Microsoft NLB with Arista L2LS (without VxLAN) and L3LS VxLAN fabric setup to avoid the most common issues during the deployments. NLB Introduction The Network Load Balancing (NLB) feature distributes traffic across several servers by using the TCP/IP networking protocol. By combining two or more computers that are running applications into a single virtual cluster, NLB provides reliability and performance for web servers and other mission-critical servers. Three modes of operation in NLB Unicast All the NICs assigned to a Microsoft NLB cluster share a common MAC address. The MAC...
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VxLAN VTEP counters on 7020R, 7280R, 7280R2, 7280R3, 7500R, 7500R2, and 7500R3 series

Description The VxLAN VTEP counters feature allows the device to count VxLAN packets received and sent by the device on a per VTEP basis. Specifically, it enables the device to count bytes and packets that are encapsulated and decapsulated as they are passing through. The counters are logically split up in the two VxLAN directions: “encap” counters count packets coming from the edge, encapsulated on the device and directed to the core “decap” counters count packets coming from the core, decapsulated on the device and heading towards the edge. To be able to count VxLAN packets the device has to...
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Multiple VXLAN to interface

Hello, I’m testing vEOS with basic flood-and-learn VXLAN topology. Is it possible to assign multiple VXLAN to a single interface? i.e. int Et1: untagged frames are mapped to VNI xxxx tagged frames (vlan 123) are mapped to VNI yyyy tagged frames (vlan 456) are mapped to VNI zzzz     so that on the linux end host, the configuration will be something like: eth0: public_ip/32 gw: virtual_gw Vlan.123: private_subnet Vlan.456: private_subnet

Still warning in vxlan config-sanity

Hi All I deploy vxlan that controlled by CVX. However there some warning in config-sanity. below are the output text from “show vxlan config-sanity” Local VTEP Configuration Check WARN VLAN-VNI Map WARN VLAN 915 does not exist VLAN-VNI Map WARN VLAN 916 does not exist VLAN-VNI Map WARN VLAN 920 does not exist Flood List WARN No remote VTEP in VLAN 920 Flood List WARN No remote VTEP in VLAN 915 Flood List WARN No remote VTEP in VLAN 916 Routing WARN Virtual VTEP IP is not configured CVX Configuration Check FAIL CVX Server FAIL No route to MLAG...
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Head-End-Replicated DHCP Packets Suppression in VXLAN Network

Description In VXLAN networks, broadcast DHCP requests are head-end-replicated to all VXLAN tunnel endpoints (VTEP). If a DHCP relay helper address is configured on more than one VTEP, each such VTEP relays the DHCP request to the configured DHCP server. This could potentially overwhelm the DHCP server as it would receive multiple copies of broadcast packets originated from a host connected to one of the VTEPs. In Figure 1, a DHCP request from DHCP Client1 is head-end-replicated to all VTEPs. DHCP Relay on VTEPs B and C will also forward this request to the DHCP server, resulting in three copies...
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vxlan configuration

Hi there I made vEOS lab for bgp evpn switchs and i got some error   when i made vxlan interface configuration .. i add static vlan vni mapping on that interface like this ! interface Vxlan1 vxlan source-interface Loopback1 vxlan controller-client import vlan none vxlan udp-port 4789 vxlan vlan 1000-2000 vni 1000-2000 ! it works..   then i want to extend of range for more vlan useage i changed like this ! interface Vxlan1 vxlan source-interface Loopback1 vxlan controller-client import vlan none vxlan udp-port 4789 vxlan vlan 11-3200 vni 11-3200 ! Then..  Ethernet interface wont up state it told notconnect...
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EVPN L3 Gateway

Description This feature adds control plane support for inter-subnet forwarding between EVPN networks. This support is achieved by advertising received EVPN IP Prefix routes (Type-5) with next-hop self. VXLAN and MPLS encapsulation are supported, and the encapsulation type used for advertised routes is dependent on the encapsulation type configured for EVPN peering. The following diagram shows an example topology where an EVPN VXLAN network exchanges Type-5 routes with an EVPN MPLS network.   Within the EVPN VXLAN and EVPN MPLS network, EVPN routes are exchanged as normal. The L3 gateway functionality is achieved by GW1/2 and GW3/4 advertising received type-5...
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EVPN VXLAN single-gateway centralized routing

Description In a traditional EVPN VXLAN centralized anycast gateway deployment, multiple L3 VTEPs serve the role of the centralized anycast gateway.  In order for hosts to have a consistent ARP binding for any of the individual centralized gateway VTEPs, each VTEP operating as a centralized gateway is configured with a virtual router MAC (VARP MAC), and a virtual VTEP IP (VARP VTEP IP), that is shared between all of the L3 VTEPs operating as centralized gateways.  Each centralized gateway VTEP also advertises an EVPN type-3 route for both its primary VTEP IP and VARP VTEP IP, so both IPs end...
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