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SD-Access also places additional information in the fabric VXLAN header including alternative forwarding attributes that can be used to make policy decisions by identifying each overlay network using a VXLAN network identifier (VNI). Layer 2 overlays are identified with a VLAN to VNI correlation (L2 VNI), and Layer 3 overlays are identified with a VRF to VNI correlation (L3 VNI). Policy Administration Node (PAN)— A Cisco ISE node with the Administration persona allows performs all administrative operations on Cisco ISE. It handles all system-related configurations that are related to functionality such as authentication, authorization, and auditing. Cisco Network Plug and Play Process—This pre-installed capability is present on Cisco DNA Center. It receives Plug and Play requests from Cisco devices and then provisions devices based on defined rules, criteria, and templates. For campus designs requiring simplified configuration, common end-to-end troubleshooting tools, and the fastest convergence, a design using Layer 3 switches in the access layer (routed access) in combination with Layer 3 switching at the distribution layer and core layers provides the most rapid convergence of data and control plane traffic flows. 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
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Access points and other Power over Ethernet (PoE) devices can be connected directly to both variants of extended node switches. When connecting PoE devices, ensure that there is enough available PoE power available. This is especially true with Industrial Ethernet Series switches which have significant variety of differing powering options for both AC and DC circuits. The liquid stitch option is a permanent fabric glue that will not go away. One of the more positive aspects of a liquid stitch is that it will work on anything. It is a tough glue that has very strong holding power. Increased capacity of wireless access points—The bandwidth demands on wireless access points (APs) with the latest 802.11ac Wave 2 and 802.11ax (Wi-Fi 6) technology now exceed 1 Gbps, and the IEEE has now ratified the 802.3bz standard that defines 2.5 Gbps and 5 Gbps Ethernet. Design and edit any pattern, even trace them from your favorite photographs. Create simple or intricate pantographs, and so much more!!!! Policy—Defines business intent including creation of virtual networks, assignment of endpoints to virtual networks, policy contract definitions for groups, and configures application policies (QoS).
If shared services are deployed locally, the peer device is commonly a switch directly connected to the Fabric in a Box with services deployed as virtual machines on Cisco UCS C-Series Server. An alternative is to deploy a UCS E-series blade servers on the routing infrastructure to virtualize the shared services. Besides scraping one good way to remove glue is to heat it again and let the water whisk it away. That process is done with your washing machine and the temperature setting. Of course, you do not want the water too hot for those fabrics that do not do well with heat. Wireless infrastructure—Radio frequency performance and cost efficiency is improved using common wireless LANs (single SSID) versus previous inefficient strategies of using multiple SSIDs to separate endpoint communication. Traffic isolation is achieved by assigning dedicated VLANs and using dynamic VLAN assignment using 802.1X authentication to map wireless endpoints into their corresponding VNs. 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.
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Software-defined segmentation—Scalable group tags assigned from group-based policies can be used to segment a network to achieve data plane isolation within physical and virtual networks. One alternative you can try is Elmer’s or other regular glue that has been watered down enough to hold the fabric without making it too stiff. Regular scotch tape is another product you have around the house and it will be a temporary fix at best. As campus network designs utilize more application-based services, migrate to controller-based WLAN environments, and continue to integrate more sophisticated Unified Communications, it is essential to integrate these services into the campus smoothly while providing for the appropriate degree of operational change management and fault isolation. And this must be done while continuing to maintain a flexible and scalable design. This reference model transit is high-bandwidth (Ethernet full port speed with no sub-rate services), low latency (less than 10ms one-way as a general guideline), and should accommodate the MTU setting used for SD-Access in the campus network (typically 9100 bytes). The physical connectivity can be direct fiber connections, leased dark fiber, Ethernet over wavelengths on a DWDM system, or metro Ethernet systems (VPLS, etc.) supporting similar bandwidth, port rate, delay, and MTU connectivity capabilities.
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. 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.Outside the fabric on a device with Cisco TrustSec capability—Inline devices with Cisco TrustSec capability carry the SGT information in a CMD header on the Layer 2 frame. This is the recommended mode of transport outside the SD-Access network. Greenfield networks have the advantage that the network can be designed as new from the ground up. Brownfield networks may have less flexibility due to geography, fiber, or existing configurations. Ultimately, the goal in brownfield environment is to use it in as an SD-Access network, and careful and accurate information, configuration, and topology details for the existing network should be collected in advance to migration. Migration from a traditional network to an SD-Access network can be accomplished through the following approaches: Clear nail polish is one of the better choices as well. Most women have it in their bedrooms or make-up kits so it is free to use until you run out and it is always handy to find. In the SD-Access fabric, the overlay networks are used for transporting user traffic across the fabric. The fabric encapsulation also carries scalable group information used for traffic segmentation inside the overlay VNs. Consider the following in the design when deploying virtual networks:
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