February is here. Winter is in full swing on this side of the equator. Summer is grasping the other. I know it’s been a warm one so far for our friends in Australia. But snowfall amounts in the Northeast has our ski areas in Northern California and the Rockies so envious. Such is Mother Nature right?
Recently, our team announced some important details for our Switching and Wireless products.
I thought I would take the time to let you all know more on these announcements.
First up, Nasser Tarazi, Wireless Product Manager, announced two new models. We will cover the new WAP351 this week and the new WAP131 next week.
The New Cisco WAP351
The new Cisco WAP351 perfect for conference rooms, classrooms, hospitality and other flexible deployments. It offers Dual Radio (2.4Ghz and 5Ghz) wireless N connectivity, a 5-port Switch with PoE PD and PSE support, Single Point Setup, Captive Portal and comes with Limited Lifetime Warranty.
The WAP351 offers something new to the Wireless portfolio. Here is a quick Power Over Ethernet (PoE) primer. PoE Powered-Device (PD) is the ability to power the device through an PD-capable Ethernet port. PoE PSE (Power Sourcing Equipment) is the ability to supply power a device connected to a PSE-capable Ethernet port. In terms of power, a standard PoE port can support a maximum output of 15W, while a PoE+ port supports up to 30W.
Now, back to the WAP351. As mentioned above, the WAP351 support both PD and PSE. This means if the WAP351 is connected to a PoE+ switch like the SG300-10PP, the WAP351 can be power through PD-capable Ethernet port, while at the same time powering a standard PoE device like a phone or another AP, like the WAP131 through the WAP351’s designated PSE-capable Ethernet port.
More on Wireless Access Points and PoE:
- PoE: Power over Ethernet. PoE enables Power and Data to be combined onto a single Ethernet cable to power devices such as access points, IP phones, or IP cameras
- PSE on a WAP is exclusive to the new WAP351
- A WAP with PSE is attractive for verticals such as education, hospitality, and smaller offices and meeting rooms where both wired and wired access is required
- PoE enables WAP’s or other endpoint devices to be installed where power typically is not available, such as on a wall or ceiling. This allows for greater flexibility during deployments.
- All Cisco Small Business WAP’s support PoE PD
- Dual-Radio WAPs requiring 802.3af PoE power = WAP131, WAP351, WAP561
- Dual-Radio WAPs requiring 802.3at PoE+ power = WAP371, WAP351 when using the PSE with full power budget
- The WAP351 can be powered by 48V/1.25A external DC power if a 802.3af/t PoE switch is not used or available
- The WAP351 can provide 6w of PSE when using 802.3af
Ok you got it? Make sense?
Cisco 300 Series Switches
In other news:
Switching Product Manager Michael Wynh announced several price reductions on the ever-popular 300 Series Switches. This is good news for our customers and channel partners alike. Businesses can maximize their budgets and take advantage of Cisco’s class-leading PoE switching products. For more information on these important updates, please contact your local Cisco Representative or check out our support community.
That is it for now. Thanks for hanging out with us.
Until next time,
Tags: #wireless, access point, Cisco, Cisco Wireless, ethernet, network, PoE ports, port, router, switch, VLAN, wlan
Given the tremendous interest in VXLAN with MP-BGP based EVPN Control-Plane (short EVPN) at Cisco Live in Milan, I decided to write a “short” technology brief blog post on this topic.
VXLAN (IETF RFC7348) has been designed to solve specific problems faced with Classical Ethernet for a few decades now. By introducing an abstraction through encapsulation, VXLAN has become the de-facto standard overlay of choice in the industry. Chief among the advantages provided by VXLAN; extension of the todays limited VLAN space and the increase in the scalability provided for Layer-2 Domains.
Extended Namespace – The available VLAN space from the IEEE 802.1Q encapsulation perspective is limited to a 12-bit field, which provides 4096 VLANs or segments. By encapsulating the original Ethernet frame with a VXLAN header, the newly introduced addressing field offers 24-bits, thereby providing a much larger namespace with up to 16 Million Virtual Network Identifiers (VNIs) or segments.
While the VXLAN VNI allows unique identification of a large number of tenant segments which is especially useful in high-scale multi-tenant deployments, the problems and requirements of large Layer-2 Domains are not sufficiently addressed. However, significant improvements in the following areas have been achieved:
- No dependency on Spanning-Tree protocol by leveraging Layer-3 routing protocols
- Layer-3 routing with Equal Cost Multi-Path (ECMP) allows all available links to be used
- Scalability, convergence, and resiliency of a Layer-3 network
- Isolation of Broadcast and Failure Domains
IETF RFC7348 – VXLAN: A Framework for Overlaying Virtualized Layer 2 Networks over Layer 3 Networks
Scalable Layer-2 Domains
The abstraction by using a VXLAN-like overlay does not inherently change the Flood & Learn behavior introduced by Ethernet. In typical deployments of VXLAN, BUM (Broadcast, Unicast, Multicast) traffic is forwarded via layer-3 multicast in the underlay that in turn aids in the learning process so that subsequent traffic need not be subjected to this “flood” semantic. A control-plane is required to minimize the flood behavior and proactively distribute End-Host information to participating entities (typically called Virtual Tunnel End Points aka VTEPs) in the same segment – learning.
Control-plane protocols are mostly employed in the layer-3 routing space where predominantly IP prefix information is exchanged. Over the past years, some of the well-known routing protocols have been extended to also learn and exchange Layer-2 MAC addresses. An early technology adoption with MAC addresses in a routing-protocol was Cisco’s OTV (Overlay Transport Virtualization), which employed IS-IS to significantly reduce flooding across Data Center Interconnects (DCI).
Multi-Protocol BGP (MP-BGP) introduced a new Network Layer Reachability Information (NLRI) to carry both, Layer-2 MAC and Layer-3 IP information at the same time. By having the combined set of MAC and IP information available for forwarding decisions, optimized routing and switching within a network becomes feasible and the need for flood to do learning get minimized or even eliminated. This extension that allows BGP to transport Layer-2 MAC and Layer-3 IP information is called EVPN – Ethernet Virtual Private Network.
EVPN is documented in the following IETF drafts
Integrated Route and Bridge (IRB) – VXLAN-EVPN offers significant advantages in Overlay networking by optimizing forwarding decision within the network based on Layer-2 MAC as well as Layer-3 IP information. The decision on forwarding via routing or switching can be done as close as possible to the End-Host, on any given Leaf/ToR (Top-of-Rack) Switch. The Leaf Switch provides the Distributed Anycast Gateway for routing, which acts completely stateless and does not require the exchange of protocol signalization for election or failover decision. All the reachability information available within the BGP control-plane is sufficient to provide the gateway service. The Distributed Anycast Gateway also provides integrated routing and bridging (IRB) decision at the Leaf Switch, which can be extended across a significant number of nodes. All the Leaf Switches host active default gateways for their respective configured subnets; the well known semantic of First Hop Routing Protocols (FHRP) with active/standby does not apply anymore.
Summary – The advantages provided by a VXLAN-EVPN solution are briefly summarized as follows:
- Standards based Overlay (VXLAN) with Standards based Control-Plane (BGP)
- Layer-2 MAC and Layer-3 IP information distribution by Control-Plane (BGP)
- Forwarding decision based on Control-Plane (minimizes flooding)
- Integrated Routing/Bridging (IRB) for Optimized Forwarding in the Overlay
- Leverages Layer-3 ECMP – all links forwarding – in the Underlay
- Significantly larger Name-Space in the Overlay (16M segments)
- Integration of Physical and Virtual Networks with Hybrid Overlays
- It facilitates Software-Defined-Networking (SDN)
Simply formulated, VXLAN-EVPN provides a standards-based Overlay that supports Segmentation, Host Mobility, and High Scale.
VXLAN-EVPN is available on Nexus 9300 (NX-OS 7.0) with Nexus 7000/7700 (F3 linecards) to follow in the upcoming major release. Additional Data Center Switching platforms, like the Nexus 5600, will follow shortly after.
A detailed whitepaper on this topic is available on Cisco.com. In addition, VXLAN-EVPN was featured during the following Cisco Live! Sessions.
Do you have appetite for more? Post a comment, tweet about it and have the conversation going … Thanks for reading and Happy Networking!
Tags: #CLEUR, Cisco, cisco live, Cisco Nexus, Cisco Nexus 9000, data center, EVPN, ietf, network, nexus, rfc7348, SDN, VXLAN
Network customers have always bought networks for one and only one reason: to run their applications over them. Yet for most of that time, those networks have been largely oblivious to the composition of the network traffic they carried. Traditional network tools could tell you whether your network was having a lot of errors, or whether a given link or interface was congested, but they couldn’t tell you what was congesting your network, beyond the limited granularity of a few well-known ports. Finding out that you’ve got a lot of HTTP or HTTPS is not very helpful in finding out whether you’re swamped by personal traffic that needs to be controlled, or by legitimate business traffic that requires an increase in effective bandwidth.
Read More »
Tags: bandwidth, Cisco Application Experience, InfoVista, IWAN, managed services, network, routing, vodafone, Vodafone Application Visibility and Control, WAN
By Lisa Garza, Marketing Manager
I had the pleasure of visiting this vibrant island country while we were filming this video. The Republic of Malta sits in the Mediterranean south of Sicily and north of Libya, a strategic crossroads with a visible history that dates back to thousands of years BC. Some of the oldest standing temples in Malta pre-date the Egyptian Pyramids by a millennium.
What a joy, then, to experience the thoroughly modern nation that Malta has become, thanks in part to the vision of the telecommunications provider Melita. The name Melita itself reflects the long history of the country – thought to derive from an ancient Greek word for “honey-sweet”, reflecting a unique species of bees that are found in Malta. Read More »
Tags: broadband, carrier, Melita, mobility, network, Service Provider, Smart Island, telecommunications, wifi
By Andrew Mackay, Head of Mobile Solutions, APAC
I have discussed in the past the increasing importance of Smallcells in a Service Providers access strategy (Bringing LTE Indoors and Cost Optimised Indoor Coverage), but to truly leverage Smallcells once deployed in an optimal way is not a trivial task. Normally the Smallcell supplier is different to the Macro network and often a different mix of technologies (e.g in the case of Wi-Fi) and frequency bands are involved. The term Heterogeneous, meaning “diverse in character or content” (oxforddictionaries.com), is indeed fitting. So what is the right approach to building an optimal Heterogeneous Network or HetNet?
The guiding principle must be the consideration of end user Quality of Experience (QoE). Read More »
Tags: ANDSF, Cisco Quantum software, connectivity, cSON, dSON, HetNet, LTE, mobile, network, orchestration, ott, QoE, service providers, Smallcell, Solutions, wifi