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Ask the Expert: Cisco Catalyst 6800 Series Switches

ciscomoderator
Community Manager
Community Manager

Welcome to the Cisco Support Community Ask the Expert conversation. This is an opportunity to learn and ask questions about the Cisco Catalyst 6800 Series Switches with Cisco expert Amer Atout. 

Cisco Catalyst 6800 Series Switches are programmable campus backbone switches optimized for 10/40/100 Gigabit Ethernet services. They provide slot capacity of up to 880 G and smart and simple network operations using Cisco Catalyst Instant Access. These switches offer converged wired, wireless, and VPN security and exceptional investment protection with their Cisco Catalyst 6500 inheritance.

Amer Atout is a product manager for the Cisco Catalyst 6800 and 6500 Series Switches. He is responsible for promoting the next-generation supervisor module and fixed aggregation platforms. Previously, Amer was a customer escalation engineer for the Cisco Catalyst Access platforms, where he led in the resolution of escalated issues on Cisco Catalyst 4000, 3000, and 2000 products; increased customer satisfaction; and improved product quality. Amer holds a master's degree in electrical engineering from the University of Michigan, Ann Arbor and a bachelor's degree in computer engineering from the University of Jordan, Amman. 

* * Remember to use the rating system to let Amer know if you have received an adequate response. * *

Amer might not be able to answer each question due to the volume expected during this event. Remember that you can continue the conversation in Network Infrastructure community,  sub-community, LAN, Switching and Routing discussion forum shortly after the event. This event lasts through January 16, 2015. Visit this forum often to view responses to your questions and the questions of other community members.

21 Replies 21

Eugene Khabarov
Level 7
Level 7

So let me ask simple question: Can we compare Catalyst 6800 with Nexus 7K family? Where will be used each of them? Where is the positioning of Catalyst 6800 family it today's Nexus world? Pros and cons?

Hi Eugene,

The decision of choosing between Catalyst and Nexus varies from customer to customer and depends on many factors including the position in the network and the feature set the customer is looking to use and deploy.

The Cisco Catalyst 6800 product line is focused on Video, Campus Segmentation, Application Visibility, and Smart Operations making it an ideal for Campus Backbone deployments (Campus Core and Aggregation layers). Features you find on this platform include Easy Virtual Networks, Flexible Netflow, Smart Install, and the Catalyst Instant Access.

Similarly, The Nexus product line is focused on DC Virtualization, LAN/SAN Convergence, Fabric Scale and Data Center Operations making it an ideal product for Data Center Core, Aggregation and DCI. Features you find on this platform include OTV, Multi-hop FCoE, FabricPath, and FEX.

Hope this helps.

p3sysnet
Level 1
Level 1

what are the significant differences between 6500 and 6800 series? we are planning to upgrade our core switches this 2015 and we would want to know which is the best investment. thanks!

Hi Peter,

The advantage of the Cisco Catalyst 6807-XL is that it unlocks higher per-slot bandwidth while keeping the same Cisco Catalyst 6500 DNA and rich feature set.

The same Supervisor Engine 2T will be able to provide up to 220 Gbps of per-slot bandwidth when it is inserted in the Cisco Catalyst 6807-XL  chassis which makes it optimized to support high-density 10 Gigabit, 40 Gigabit, and future 100 Gigabit Ethernet.

For example, the new C6800-32P10G card will run at a higher per-slot bandwidth of 160 Gbps in Catalyst 6807-XL versus 80 Gbps in Catalyst 6500E chassis.

In addition, the Cisco Catalyst 6807-XL chassis is capable of delivering up 880 Gbps of per-slot bandwidth for future needs.

a12288
Level 3
Level 3

Hi, Amer.

 

Our env is around 20,000 switch ports and 20,000 / 48 L2 access layer switches, We have been using FEX in our DC and like the its idea. Regarding the IA, what will he practical limit on this concept, considering the 6800 will consolidate and process all of the L2 tables from IA? Have you seen any Cisco customer deployed IA in a large scale? Thanks.

 

Leo

Hello Leo,

Thanks for you interest in the Catalyst Instant Access technology. The Catalyst Instant Access can scale up to 2,000 switch ports (42 access switches) in one Instant Access domain managed by a VSS pair of Catalyst 6880-X-LE or Catalyst 6880-X. 

For such large deployments as yours, we see customers deploy multiple Instant Access domains connected to a campus core switch such as the Catalyst 6807-XL with the C6800-32P10G cards. The resulting architecture will look like the following:

 

 

Traditionally, you have to manage more than 400 switches for your 20,000 switch port deployment. With Catalyst Instant Access, you have to manage only 10 virtual switches. Catalyst Instant Access technology simplifies the management and help reduce your TCO.

If you have more questions, please have your account manager contact me directly and I will be happy to discuss further.

Jon Marshall
Hall of Fame
Hall of Fame

Hi Amer

When you enable performance mode for a module it shuts down certain ports within a port group so it can't oversubscribe the switch fabric connection per port group.

Does enabling performance mode do anything else ?

I was thinking specifically of reallocating port buffers so that each port gets more memory to use.

Does it do this and is there anything else it does as well ?

I'm asking because questions have come up from time to time about whether performance mode is always needed to avoid oversubscription ie. you may only want to guarantee a few ports no oversubscription but be happy for the rest to be oversubscribed.

If all it is doing is shutting down ports then in these cases using performance mode can actually be a bit of blunt tool because you may be able to use more ports than performance mode would give you and still guarantee some ports were not oversubscribed.

But if performance mode does other things then by not using it you may be missing out on some of it's advantages.

Hope that made sense.

Jon

 

Hi Jon,

Performance mode enables line rate and double the port buffer size, by using half of the ports. It is applied per port group. Each port group has 8 ports which can run either in oversubscribed more or in performance mode (4 ports will be in shutdown state and buffers will be reallocated).

Hope this helps.

rpatnaik_slf
Level 1
Level 1

Hi Amer,
We've been performing a POC in our lab environment with the 6880-X-LE. We like the ability to simplify our campus environment and provide us sub-second convergence without modification of OSPF timers.  We also find it intriguing to use GE optics in a 10GE+based platform.  What we've run into though is the following:

1) unstable code - 15.1(2)SY2 ---> now SY4 do to a SEV 1 related to VSL timeout

2) issues with the recognition of optics when a failover event occurs ex. GLT-C 1 GE recognized as a 10Gb after the box comes back up

3) issues with the eFSU upgrade - one of our switches hung during the process. Power cycle fixed it.

Can you talk or discuss if these are common problems?  What are other customers experiencing?  If they are experiencing similar issues how are they mitigating them.

Cheers,
Rash

Hello Rash,

I am sorry you faced issues with Catalyst 6880-X. Please reach out to your account manager who can connect us to have a discussion around this.

Regards.

Hi Amer,

Our account manager is aware. I will reach out to the Cisco team again.

Cheers,

Rash

Reuben Farrelly
Level 3
Level 3

Hi Amer

Can you tell us how the new 2960CX and 3560CX switches will fit into this architecture?  I have seen some slides from Cisco presentations on slideshare that show that these switches integrate with the 6800s and Instant Access, but I can't find any information on CCO as to how this will work in practice.

Thanks,

Reuben

 

Hello Reuben,

The 2960CX and 3560CX can connect directly to the Instant Access client and managed on its own.

Please contact your account manager and we can discuss the details of the slides shared with you.

Hope this helps.

rpatnaik_slf
Level 1
Level 1

Amer,
Another question regarding configuring the VSL PO between the 6880 Switches in the virtual domain.  Do you recommend enabling:

carrier delay/dampening

load interval

and/or logging events for link/bundle status.

Since there is some possibility that traffic will transit this PO.  I've seen no indication of this anywhere in CCO.

Cheers,
Rash

 

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