For more information on Layer 3 routed access design methodology and high availability tuning, please see: Routed Access Layer Design Guide, Tuning for Optimized Convergence Guide , and Routed Access Layer Assurance Guide. Cisco® Software-Defined Access (SD-Access) is the evolution from traditional campus designs to networks that directly implement the intent of an organization. SD-Access is software application running on Cisco DNA Center hardware that is used to automate wired and wireless campus networks. When designing the network for the critical VLAN, this default macro-segmentation behavior must be considered. For example, consider if the subnet assigned for development servers is also defined as the critical VLAN. In the event of the RADIUS server being unavailable, new devices connecting to the network will be placed in the same VLAN as the development servers. Because these devices are in the same VN, communication can occur between them. This is potentially highly undesirable. The Catalyst 9800 Embedded Wireless Controller for Catalyst 9000 Series switches is supported for SD-Access deployments with three topologies: The SD-Access architecture is supported by fabric technology implemented for the campus, enabling the use of virtual networks ( overlay networks) running on a physical network ( underlay network) creating alternative topologies to connect devices. This section describes and defines the word fabric, discusses the SD-Access fabric underlay and overlay network, and introduces shared services which are a shared set of resources accessed by devices in the overlay. This section provides an introduction for these fabric-based network terminologies used throughout the rest of the guide. Design consideration for these are covered in a later section.

After pouring some on the glue area wait as instructed and then wipe the glue off with a clean towel. Heated white vinegar will be a good replacement for those products. The reason for that is vinegar is safe to use on all fabrics while those store products are not. Let the vinegar soak in for 30 minutes before removing it. Remove Krazy Glue From Fabric Layer 2 flooding works by mapping the overlay subnet to a dedicated multicast group in the underlay. Broadcast, link-local multicast, and ARP traffic are encapsulated in fabric VXLAN and sent to the destination underlay multicast group. PIM ASM is used as the transport mechanism. Policy Service Node (PSN)— A Cisco ISE node with the Policy Service persona provides network access, posture, guest access, client provisioning, and profiling services. This persona evaluates the policies and makes all the decisions. Typically, there would be more than one PSN in a distributed deployment. All Policy Service nodes that reside in the same high-speed Local Area Network (LAN) or behind a load balancer can be grouped together to form a node group.The generic term fusion router comes from MPLS Layer 3 VPN. The basic concept is that the fusion router is aware of the prefixes available inside each VPN (VRF), generally through dynamic routing, and can therefore fuse these routes together. In MPLS Layer 3 VPN, these generic fusion routers are used to route traffic between separate VRFs (VRF leaking). Alternatively, the fusion router can also be used to route traffic to and from a VRF to a shared pool of resources in the global routing table (route leaking). Both responsibilities are essentially the same as they involve advertising routes from one routing table into a separate routing table. AAA Authenticator—The mapping of endpoints into VLANs can be done statically or dynamically using an Authentication Server. Operating as a Network Access Device (NAD), the edge node is an integral part of the IEEE 802.1X port-based authentication process by collecting authentication credentials from connected devices, relaying the to the Authentication Server, and enforcing the authorization result. Additional design details and supported platforms are discussed in Extended Node Design section below. For additional details on deployment scenarios, SGTs over GRE and VPN circuits, and scale information, please see the SD-Access Segmentation Design Guide.

If VRF-lite cannot be used end to end, options still exist to carry VRFs. The supported options depend on if a one-box method or two-box method is used. However, some networks need to utilize broadcast, particularly to support silent hosts which generally require reception of an ARP broadcast to come out of silence. This is commonly seen in some building management systems (BMS) that have endpoints that need to be able to ARP for one other and receive a direct response at Layer 2. Another common use case for broadcast frames is Wake on LAN (WoL) Ethernet broadcasts which occur when the source and destination are in the same subnet. What is the strategy for integrating new overlays with common services (for example: Internet, DNS/DHCP, data center applications)? To achieve optimal performance in a fabric role, routing platforms should have a minimum of 8 GB DRAM.In typical hierarchical design, the access layer switch is configured as a Layer 2 switch that forwards traffic on high speed trunk ports to the distribution switches. The distribution switches are configured to support both Layer 2 switching on their downstream trunks and Layer 3 switching on their upstream ports towards the core of the network. The function of the distribution switch in this design is to provide boundary functions between the bridged Layer 2 portion of the campus and the routed Layer 3 portion, including support for the default gateway, Layer 3 policy control, and all required multicast services. Extended nodes offer a Layer 2 port extension to a fabric edge node while providing segmentation and group-based polices to the endpoints connected to these switches. Endpoints, including fabric-mode APs, can connect directly to the extended node. VLANs and SGTs are assigned using host onboarding as part of fabric provisioning. Native multicast does not require the ingress fabric node to do unicast replication. Rather the whole underlay, including intermediate nodes (nodes not operating in a fabric role) are used to do the replication. To support native multicast, the FHRs, LHRs, and all network infrastructure between them must be enabled for multicast.

RFC 7348 defines the use of virtual extensible LAN (VXLAN) as a way to overlay a Layer 2 network on top of a Layer 3 network. Each overlay network is called a VXLAN segment and is identified using a 24-bit VXLAN network identifier, which supports up to 16 million VXLAN segments. Or you can spray some lubricant like WD-40 onto the glue, wait and then rinse off. Just make sure the rinsing is very thorough. Then let the surfaces dry or you can wipe them off with a dry towel if you are in a hurry. Removing Glitter Glue From Fabric Layer 2 Handoff—This feature of connects a traditional network with an SD-Access network. This feature can be used during transitions and migrations in concert with the following approach.Cisco Catalyst 9800 Series, Aironet 8540, 5520, and 3504 Series Wireless LAN Controllers are supported as Fabric WLCs.Similarly, the Cisco Catalyst 9100 and Cisco Aironet Wave 2 and Wave 1 APs are supported as fabric-mode access points. Getting glue on your fine or everyday fabrics is nothing to get upset about. As you can see the removal processes are very easy to do and you may have the removers in your home right now. Additional enhancements are available to devices operating as Policy Extended Nodes. This capability is supported on the Cisco Catalyst IE-3400 and IE-3400H Series Switches. In addition to the operation and management provide by a classic extended node, policy extended nodes directly support SGTs. This provides direct east-west traffic enforcement on the extended node. Similarly, critical voice VLAN support works by putting voice traffic into the configured voice VLAN if the RADIUS server becomes unreachable. The advantage of head-end replication is that it does not require multicast in the underlay network. This creates a complete decoupling of the virtual and physical networks from a multicast perspective. However, this can create high overhead on the FHRs and result in high bandwidth and CPU utilization. In deployments where multicast cannot be enabled in the underlay networks, head-end replication can be used. Networks should consider Native Multicast due to its efficiency and the reduction of load on the FHR fabric node.

Subinterfaces (Routers or Firewall)—A virtual Layer 3 interface that is associated with a VLAN ID on a routed physical interface. It extends IP routing capabilities to support VLAN configurations using the IEEE 802.1Q encapsulation. Layer 3 routed access is defined by Layer 3 point-to-point routed links between devices in the Campus hierarchy. In an SD-Access network, Access and distribution switches should not peer with their upstream neighbors using SVIs and trunk ports. SVIs and trunk ports between the layers still have an underlying reliance on Layer 2 protocol interactions.

In SD-Access the control plane is based on LISP (Locator/ID Separation Protocol), the data plane is based on VXLAN (Virtual Extensible LAN), the policy plane is based on Cisco TrustSec, and the management plane is enabled and powered by Cisco DNA Center. For hard surfaces, you can scrape the glue off and use some rubbing alcohol instead of nail polish remover. A little time and a little elbow grease are all you need. Some Final Words