I previously discussed using LISP to optimize your client-server traffic so today I’ll discuss the reverse direction: Egress Path Optimization from the Server to the Client. Let’s go over the need for Path Optimization in the direction from Server-to-Client with some pictures and explanations.
The Virtual Machine (VM) server is configured with a default gateway IP address, 192.168.1.1, which is the next hop IP address that the VM will forward packets towards as the traffic returns to the client outside the data center. In this data center environment, we’ve deployed the default gateway using the First Hop Redundancy Protocol (FHRP). In reality, FHRP is an umbrella technology term that includes Hot Standby Routing Protcol (HSRP) and Virtual Router Redundancy Protocol (VRRP), two main technologies that provide transparent failover and redundancy at the first hop IP router. Please see info on FHRP here.
Also notice that the VM default gateway is the same as the HSRP Virtual IP Address (VIP). The HSRP VIP binds itself to one of the physical HSRP Routers via an HSRP election process using Layer 2 control packets between the two physical HSRP Routers and this means that the VM default gateway, since it points to a VIP, may move between physical HSRP Routers, and of course which is then intent and design when using any type of FHRP.
In the above picture, the Path is Optimized from Server to Client, so now let’s take a look at what happens when we migrate the VM to the new data center.
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Tags: cloud, data center, Data Center Interconnect, DCI, FHRP, HSRP, LISP, mobility, N7K, Nexus 7000, OTV, vMotion, Workload Mobility
IT Brand Pulse released a series of awards and survey results today that confirmed Cisco’s Market Leadership position in Network Virtualization. In a survey of IT professionals, respondents were asked to name the market, price, performance, reliability, service and support, and innovation leader in the category of network virtualization technology. [Note: We will be making the report available to readers of this blog post here later this week when it's available.]
Cisco won a close race with 2011 leader VMware, to take the 2012 Market Leader award, and was also chosen as the Performance, Reliability, and Service and Support leader. Read More »
Tags: Nexus 1000v, Nexus 1010, Virtual Security Gateway, vsg, vWAAS
Update: LISP solves the problem from client to server, IE Ingress Path Optimization. FHRP solves the problem from server to client, IE Egress Path Optimization. You can check out Egress Path Optimization here.
We recently published a Data Center Interconnect -- DCI- related document on cisco.com and I wanted to get it in front of you. Locator/Identifier Separator Protoc0l -- LISP -- provides the path optimization technology to forward transactions via the most direct path, ultimately meaning better application performance. The link for the LISP Virtual Machine Mobility paper is below.
As a side note, LISP can be used many other ways and here’s a pointer to one of our LISP pages.
For our purposes in DCI, we use LISP for path optimization and we can see here why the need arises. The box on the left shows an existing transaction that looks pretty direct. The middle box shows the workload is now in a new data center but the transaction is suboptimal, it still goes through the firsts data center. The box on the right shows the desired path, the direct path from user to workload withouth going through the first data center. It’s pretty easy to see the need here for path optimization and the desire to have the direct path to the new data center location as shown on the far right box.
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Tags: Disaster Planning, disaster recovery, LISP, LISP ASM, LISP ESM, Virtual Machine Mobility, vMotion
Last month the VCE Company, the joint venture between Cisco and EMC (with investments from VMware and Intel) that makes the Vblock infrastructure platforms, released a report on Cisco’s virtual services validating their suitability on the Vblock platform. The 40 page technical report covers both Cisco’s Virtual Security Gateway (VSG) firewall, and our Virtual Wide Area Application Services (vWAAS) WAN optimization solution. Both Cisco products run as virtual machines on a VMware hypervisor and the Nexus 1000V virtual switch on an application server, or in the case of VSG, on a Nexus 1010 services appliance. Read More »
Tags: Nexus 1000v, Nexus 1010, Vblock, Virtual Security Gateway, Virtual Wide Area Application Services, vsg, vWAAS
Every year I decorate my home’s front door for the holidays, it’s very simple just evergreens, some pine cones, maybe some sticks with berries. It takes about a day, I get up early the first Sunday of December and drive around the rural areas where I live and clip greens. I look for interesting items maybe red or blue berries, cool pine cones, maybe some tall grasses that have a decorative look to them. I been doing this for about 14 years and have learned how to be more efficient by using the right tools and preparing the day before.
I make sure the wire frames that I hang the greens in are in a good state of repair, I get out my warm gear since I’ll be outside all day, setup my van so I have a place to put the clippings. I even coat all my fingertips with a product called nu-skin since the greens can be pretty sharp and at the end of the day my hands are beat up. My preparation and implementation methods have evolved over the years and I think now I have it down to a science, the results of my efforts are shown below with before and after pictures.
What I found was that the right tools really do make a difference, my first time I had clippers that weren’t sharp enough, clothes that weren’t warm enough, and I was so frustrated when I was finished that I swore I would never do it again. The end result however was so nice and received so many compliments that the next year I tried it again but did it a little smarter. I used the right tools for the job.
The right tools will always help but you have to know how to use them and then sometimes you have to use them a lot to get comfortable. When it comes to XML the tool that I found does a great job is xmlstarlet. One of the features of Cisco’s UCS Manager is the ability to send a system inventory email using Callhome. The inventory email can be sent automatically on a regular basis with the minimal interval of a day. The UCS inventory email contains all sorts of useful information
- IP addresses
- Serial Numbers
- Firmware Levels
- Fabric Interconnects
- Associated Service Profiles
This information and more can be retrieved from the Callhome email. What follows is a detailed breakdown of an xmlstartlet command to mine the UCS inventory information from the Callhome inventory email.
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Tags: Callhome, Parsing, UCS, XML