Globally enable the OTV feature. Enable IGMPv3 on the join interfaces. Ensure connectivity for the VLANs to be extended to the OTV edge device. If you configure VDCs, install the Advanced Services license and enter the desired VDC (see the Cisco Nexus 7000 Series NX-OS Virtual Device Context Configuration Guide).
Full Answer
Can I run OTV and OTV at the same time?
There are no constraints or special requirements when running both together. OTV adds 42 bytes in the IP header packets, thus requiring a larger maximum transmission unit (MTU) for traffic to pass. It is also worth noting that OTV on the Cisco Nexus 7000 Series does not support fragmentation, so the larger MTU must be considered. .
What is OTV VLAN mapping and how to configure it?
You can configure OTV VLAN mapping to allow VLANs with different VLAN IDs to communicate across sites. The OTV VLAN mapping feature is not supported on the Cisco M3 Series and F3 Series modules.
What are the guidelines for multicast configuration in OTV?
OTV has the following guidelines for multicast configuration: OTV does not require Protocol Independent Multicast (PIM) to be configured on an edge device. If you configure PIM on the edge device, ensure that the rendezvous point (RP) is also configured on the edge device.
What is a stateful switchover in OTV?
A stateful switchover occurs when the active supervisor switches to the standby supervisor. The software applies the run-time configuration after the switchover. Any upgrade from an image that is earlier than Cisco NX-OS 5.2 (1) to an image that is Cisco NX-OS 5.2 (1) or later in an OTV network is disruptive.
What is an OTV?
How to enable fast convergence on OTV?
What is an OTV multicast?
What is OTV in ARP?
What is overlay routing protocol?
How does an edge device become an AED server?
Can you extend a VLAN?
See 4 more
About this website
What is OTV in Nexus?
OTV is a MAC-in-IP method that extends Layer 2 connectivity across a transport network infrastructure. OTV uses MAC address-based routing and IP-encapsulated forwarding across a transport network to provide support for applications that require Layer 2 adjacency, such as clusters and virtualization.
What is OTV site VLAN?
OTV uses a VLAN called “Site VLAN” within a site to detect and establish a Site Adjacency with other OTV edge devices. For Delta, the Site VLAN will be carried on multiple Layer 2 paths across the vPC connection on the Distr VDCs to increase the resiliency of this internal adjacency.
How do I add VDC to my Nexus 7000?
Nexus 7k – Getting Started Examples – Part1 (basics, VDC and vPC)Step 1 activate vpc feature.Step 2 Create VRF “vpc” and create an L3 keepalive link between the two Nexus switches.Step 3 Configure a vPC Peer Link.Step 4 Configure interface VLAN on all lab switches for VLAN 10 and VLAN 20.More items...•
What is the difference between OTV and VxLAN?
While VxLAN extends VLAN in the same Data Center, Inter Data Centers or Campus, on the other hand OTV Implements DCI with stretched subnets across Data Centers only. VxLAN and OTV are both supported by Cisco platforms like Nexus 9k,7k and CSR1000v.
Why do we need OTV?
The purpose of this technology is connecting separated data-center islands over a convenient packet switched network. It is said that OTV is a better solution compared to well-known VPLS, or any other Layer 2 VPN technology.
What is OTV AED?
OTV Authoritative Edge Device (AED): OTV Edge router that is actively extending a VLAN from a site. If we only have a single OTV Edge device at our site it will be the AED. If we have multiple Edge devices for redundancy, then the AED role will be negotiated per extended VLAN.
What is VDC in Nexus 7K?
The Nexus 7000 NX-OS software supports Virtual Device Contexts (VDCs), VDC(s) allow the partitioning of a single physical Nexus 7000 device into multiple logical devices. This logical separation provides the following benefits: Administrative and management separation.
How do I know if I have admin VDC on Nexus?
Configuring Admin VDC Enter the system admin-vdc command after bootup. All the nonglobal configuration in the default VDC is lost after you enter this command. Use system admin-vdc migrate new vdc name option commmand to migrate a non global configuration on non default vdc to new vdc.
How do you create a VDC?
Configuration of VDC in Nexus 7K: We will configure VDC from global using VDC command. N7K(config)# vdc CusA Note: Creating VDC, one moment please ... Now we will allocate resources into the vdc. We also can limit resourse usages for our CusA vdc.
What is OTV and LISP?
OTV Is Resilience; LISP is Redundancy Virtualization services such as VMware High Availability can use this capability to rapidly switch between data centers and provide a resilient service.
Why VXLAN is required?
VXLAN technology allows you to segment your networks (as VLANs do), but it provides benefits that VLANs cannot. Here are the most important benefits of using VXLANs: You can theoretically create as many as 16 million VXLANs in an administrative domain (as opposed to 4094 VLANs on a Juniper Networks device).
What is the purpose of VXLAN?
VXLAN is an encapsulation protocol that provides data center connectivity using tunneling to stretch Layer 2 connections over an underlying Layer 3 network. In data centers, VXLAN is the most commonly used protocol to create overlay networks that sit on top of the physical network, enabling the use of virtual networks.
Is OTV Cisco proprietary?
Overlay transport virtualization (OTV) is a Cisco proprietary protocol for relaying layer 2 communications between layer 3 computer networks.
What type of traffic can be forwarded by the OTV data plane?
OTV can be deployed with unicast-only transport. As previously described, a multicast-enabled transport infrastructure lets a single OTV update or Hello packet reach all other OTV devices by virtue of leveraging a specific multicast control group address.
What is FabricPath?
Cisco FabricPath is an innovation in Cisco NX-OS Software that uses routing principles to allow Layer 2 scaling in a way that was not possible before. This technology provides the flexibility and the performance required to make data centers a service for the applications that use them.
What is Vxlan Cisco?
VXLAN is a solution to support a flexible, large-scale multitenant environment over a shared common physical infrastructure. The transport protocol over the physical data center network is IP plus UDP.
OTV Best Practices Configuration Guide
© 2017 Cisco and/or its affiliates. All rights reserved. All rights reserved. This document is Cisco Public Information. Page 2 of 28 Contents
Configuring OTV on a Cisco ASR – InfraWorld
During a project I’ve been working on, we needed to configure OTV on a Cisco ASR. I did write a blog for configuring OTV on a Nexus 7000 before (click here) but the configuration on a Cisco ASR router is a bit different.The used technologies and basic configuration steps are equal, but the syntax is different for a few configuration steps .
Overlay Transport Virtualization (OTV) Unicast-Mode Transport ... - Cisco
2 Overlay Transport Virtualization (OTV) Unicast-Mode Transport Infra-ALL DESIGNS, SPECIFICATIONS, STATEMENTS, INFORMATION, AND RECOMMENDATIONS
What is stateful switchover?
A stateful restart occurs when the OTV process fails and is restarted. A stateful switchover occurs when the active supervisor switches to the standby supervisor. The software applies the run-time configuration after the switchover.
Can OTV forward Layer 2 packets?
You can configure OTV to advertise MAC address updates for a range of VLANs on an OTV overlay interface. OTV does not forward Layer 2 packets for VLANs that are not in the extended VLAN range for the overlay interface. You can add or remove VLANs from an existing extended VLAN range.
What is OTV in a network?
OTV is the fault-domain isolation feature. With OTV, fault domains are actually isolated and separate from each other without the requirement of any additional configuration.
How many bytes does an OTV packet have?
OTV adds 42 bytes in the IP header packets, thus requiring a larger maximum transmission unit (MTU) for traffic to pass. It is also worth noting that OTV on the Cisco Nexus 7000 Series does not support fragmentation, so the larger MTU must be considered.
How many data planes does a Cisco 6500 have?
vPC is also differ from VSS in Cisco 6500 catalyst switch, where VSS has the switches with only one control plane and two Data plane while in vPC environment Nexus Switches have two Data plane and two Control Plane.
Can Cisco Nexus 7000 switch be used on OTV?
Cisco Nexus 7000 Series Switches in one site and Cisco ASR 1000 Series routers at another site for OTV is fully supported. For this scenario, please keep the separate scalability numbers in mind for the two different devices, because you will have to account for the lowest common denominator.
Does OTV have a VDC?
OTV currently enforces switch-virtual-interface (SVI) separation for the VLANs being extended across the OTV link, meaning that OTV is usually in its own VDC. With the VDC license on the Cisco Nexus 7000 Series you have the flexibility to have SVIs in other VDCs and have a dedicated VDC for OTV functions.
Nexus 7000 and Discounted OTV license pak for NXOS
There are, currently, four different license upgrades for the Nexus 7000 and Cisco has a discounted license for the OTV feature set. The normal license cost for OTV is list USD$25000. But for some period of time, probably to encourage early adopters, the license has a special part number that sell for USD$5000.
Technical Note
Of course, Cisco requires that you have a full set of licenses to use OTV, even if you don’t want them. Thus to use the OTV license you must also have the L3 licenses and the VDC license.
What is an OTV?
OTV uses an overlay control-plane protocol to learn and propagate MAC routing information across the overlay network. The OTV control-plane protocol uses Intermediate-System-to-Intermediate-System (IS-IS) messages to build adjacencies to remote sites and to send MAC route updates to remote sites.
How to enable fast convergence on OTV?
You can enable OTV fast convergence by configuring a switched virtual interface (SVI) on an OTV site VLAN.
What is an OTV multicast?
An OTV network that supports IP multicast uses the control-group address, which is a multicast address, to encapsulate and exchange OTV control-plane protocol updates. Each edge device that participates in a particular overlay network shares the same control-group address with all other edge devices of the same overlay network.
What is OTV in ARP?
OTV can suppress unnecessary ARP messages from being sent over the overlay network. OTV builds a local Layer 3 to Layer 2 mapping for remote hosts. Any ARP requests from local hosts are served by this ARP Neighbor Discovery cache.
What is overlay routing protocol?
The overlay routing protocol uses the IS-IS hello messages that are sent to the multicast group address to detect and build adjacencies to remote sites on the overlay network. You configure each site in the overlay network with the same multicast group address. When local and remote sites exchange hellos, a control protocol adjacency is established between the edge devices of both sites. The overlay routing protocol optionally authenticates the remote edge device before building an adjacency to the edge device.
How does an edge device become an AED server?
An edge device becomes eligible to be an AED server after it has completed graceful insertion, specifically after the edge device has completed synchronization and formed adjacencies with all edge devices in the site. An edge device loses its eligibility to be elected as an AED server when it loses its forwarding readiness due to events either in the site or in the overlay network.
Can you extend a VLAN?
You can extend VLANs over an OTV network in order to allow VLANs with the same VLAN ID to integrate seamlessly between local and remote sites. For example, when VLAN 1 on Site A is extended to Site B, VLAN 1 on Site A integrates seamlessly with VLAN 1 on Site B.