Day one of Network Field Day 5 (NFD5) included presentations from the Cisco Borderless team. You probably remember their “speed dating” approach at NFD4 which gave us a wealth of information in 15 minute snippets. The only drawback to that lineup is when you find a product or a technology that interests you there really isn’t any time to quiz the presenter before they are ushered off stage. Someone must have listened when I said that before, because this time they brought us 20 minute segments – 10 minutes of presentation, 10 minutes of demo. With the switching team, we even got to vote on our favorite to bring the back for the next round (hence the title of the post). More on that in a bit.
6500 Quad Supervisor Redundancy
First up on the block was the Catalyst 6500 team. I swear this switch is the Clint Howard of networking, because I see it everywhere. The team wanted to tell us about a new feature available in the ((verify code release)) code on the Supervisor 2T (Sup2T). Previously, the supervisor was capable of performing a couple of very unique functions. The first of these was Stateful Switch Over (SSO). During SSO, the redundant supervisor in the chassis can pick up where the primary left off in the event of a failure. All of the traffic sessions can keep on trucking even if the active sup module is rebooting. This gives the switch a tremendous uptime, as well as allowing for things like hitless upgrades in production. The other existing feature of the Sup2T is Virtual Switching System (VSS). VSS allows two Sup2Ts to appear as one giant switch. This is helpful for applications where you don’t want to trust your traffic to just one chassis. VSS allows for two different chassis to terminate Multi-Chassis EtherChannel (MLAG) connections so that distribution layer switches don’t have a single point of failure. Traffic looks like it’s flowing to one switch when in actuality it may be flowing to one or the other. In the event that a Supervisor goes down, the other one can keep forwarding traffic.
Enter the Quad Sup SSO ability. Now, instead of having an RPR-only failover on the members of a VSS cluster, you can setup the redundant Sup2T modules to be ready and waiting in the event of a failure. This is great because you can lose up to three Sup2Ts at once and still keep forwarding while they reboot or get replaced. Granted, anything that can take out 3 Sup2Ts at once is probably going to take down the fourth (like power failure or power surge), but it’s still nice to know that you have a fair amount of redundancy now. This only works on the Sup2T, so you can’t get this if you are still running the older Sup720. You also need to make sure that your linecards support the newer Distributed Forwarding Card 3 (DFC3), which means you aren’t going to want to do this with anything less than a 6700-series line card. In fact, you really want to be using the 6800 series or better just to be on the safe side. As Josh O’brien (@joshobrien77) commented, this is a great feature to have. But it should have been there already. I know that there are a lot of technical reasons why this wasn’t available earlier, and I’m sure the increase fabric speeds in the Sup2T, not to mention the increased capability of the DFC3, are the necessary component for the solution. Still, I think this is something that probably should have shipped in the Sup2T on the first day. I suppose that given the long road the Sup2T took to get to us that “better late than never” is applicable here.
Next up was the Cisco UCS-E series server for the ISR G2 platform. This was something that we saw at NFD4 as well. The demo was a bit different this time, but for the most part this is similar info to what we saw previously.
Catalyst 3850 Unified Access Switch
The Catalyst 3800 is Cisco’s new entry into the fixed-configuration switch arena. They are touting this a “Unified Access” solution for clients. That’s because the 3850 is capable of terminating up to 50 access points (APs) per stack of four. This think can basically function as a wiring closet wireless controller. That’s because it’s using the new IOS wireless controller functionality that’s also featured in the new 5760 controller. This gets away from the old Airespace-like CLI that was so prominent on the 2100, 2500, 4400, and 5500 series controllers. The 3850, which is based on the 3750X, also sports a new 480Gbps Stackwise connector, appropriately called Stackwise480. This means that a stack of 3850s can move some serious bits. All that power does come at a cost – Stackwise480 isn’t backwards compatible with the older Stackwise v1 and v2 from the 3750 line. This is only an issue if you are trying to deploy 3850s into existing 3750X stacks, because Cisco has announced the End of Sale (EOS) and End of Life (EOL) information for those older 3750s. I’m sure the idea is that when you go to rip them out, you’ll be more than happy to replace them with 3850s.
The 3850 wireless setup is a bit different from the old 3750 Access Controller that had a 4400 controller bolted on to it. The 3850 uses Cisco’s IOS-XE model of virtualizing IOS into a sort of VM state that can run on one core of a dual-core processor, leaving the second core available to do other things. Previously at NFD4, we’d seen the Catalyst 4500 team using that other processor core for doing inline Wireshark captures. Here, the 3850 team is using it to run the wireless controller. That’s a pretty awesome idea when you think about it. Since I no longer have to worry about IOS taking up all my processor and I know that I have another one to use, I can start thinking about some interesting ideas.
The 3850 does have a couple of drawbacks. Aside from the above Stackwise limitations, you have to terminate the APs on the 3850 stack itself. Unlike the CAPWAP connections that tunnel all the way back to the Airespace-style controllers, the 3850 needs to have the APs directly connected in order to decapsulate the tunnel. That does provide for some interesting QoS implications and applications, but it doesn’t provide much flexibility from a wiring standpoint. I think the primary use case is to have one 3850 switch (or stack) per wiring closet, which would be supported by the current 50 AP limitation. the othe drawback is that the 3850 is currently limited to a stack of four switches, as opposed to the increased six switch limit on the 3750X. Aside from that, it’s a switch that you probably want to take a look at in your wiring closets now. You can buy it with an IP Base license today and then add on the AP licenses down the road as you want to bring them online. You can even use the 3850s to terminate CAPWAP connections and manage the APs from a central controller without adding the AP license.
Here is the deep dive video that covers a lot of what Cisco is trying to do from a unified wired and wireless access policy standpoint. Also, keep an eye out for the cute Unifed Access video in the middle.
Private Data Center Mobility
I found it interesting this this demo was in the Borderless section and not the Data Center presentation. This presentation dives into the world of Overlay Transport Virtualization (OTV). Think of OTV like an extra layer of 802.1 q-in-q tunneling with some IS-IS routing mixed in. OTV is Cisco’s answer to extending the layer 2 boundary between data centers to allow VMs to be moved to other sites without breaking their networking. Layer 2 everywhere isn’t the most optimal solution, but it’s the best thing we’ve got to work with the current state of VM networking (until Nicira figures out what they’re going to do).
We loved this session so much that we asked Mostafa to come back and talk about it more in depth.
The most exciting part of this deep dive to me was the introduction of LISP. To be honest, I haven’t really been able to wrap my head around LISP the first couple of times that I saw it. Now, thanks to the Borderless team and Omar Sultan (@omarsultan), I’m going to dig into a lot more in the coming months. I think there are some very interesting issues that LISP can solve, including my IPv6 Gordian Knot.
I have to say that I liked Cisco’s approach to the presentations this time. Giving us discussion time along with a demo allowed us to understand things before we saw them in action. The extra five minutes did help quite a bit, as it felt like the presenters weren’t as rushed this time. The “Borderless Idol” style of voting for a presentation to get more info out of was brilliant. We got to hear about something we wanted to go into depth about, and I even learned something that I plan on blogging about later down the line. Sure, there was a bit of repetition in a couple of areas, most notably UCS-E, but I can understand how those product managers have invested time and effort into their wares and want to give them as much exposure as possible. Borderless hits all over the spectrum, so keeping the discussion focused in a specific area can be difficult. Overall, I would say that Cisco did a good job, even without Ryan Secrest hosting.
Tech Field Day Disclaimer
Cisco was a sponsor of Network Field Day 5. As such, they were responsible for covering a portion of my travel and lodging expenses while attending Network Field Day 5. In addition, Cisco provided me with a breakfast and lunch at their offices. They also provided a Moleskine notebook, a t-shirt, and a flashlight toy. At no time did they ask for, nor where they promised any kind of consideration in the writing of this review. The opinions and analysis provided within are my own and any errors or omissions are mine and mine alone.
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