Double-sided vpc Nexus7K and NExus 5K

I have two 5548UP connected to two Nexus 7k forming double sided vPC design. The 5k is acting as access layer top of the rack and 7k as aggregate. The 7k is configured with vrf contexts and vlans with vrrp.
I followed the best practices for double-sided vpc described in this document
http://www.cisco.com/c/dam/en/us/td/docs/switches/datacenter/sw/design/vpc_design/vpc_best_practices_design_guide.pdf
I'm using the same port-channel-id and vpc-id in all 4 devices. I also have different vpc domain-ids for the N5K (domain-id:20) and N7K (domain-id:10)
All physical connectivity has been verified. I have 16-ports port-channels (8 ports on each peer)
I have also verified all vpc status: show vpc, show vpc consistency-parameters global, and everything looks good int both N5K and N7K: keepalive is alive, peer adjacency formed ok, all consistency status are success, etc
I have also checked port-channel configurations and each individual interface member of the port-channel
The problem I have is the port-channel in the N7K is no coming up and I just can't figure out why. I've checked all I can think of, and tried different things and the only way I can bring the port-channel up is if I shutdown all interfaces in the N5K connecting to the N7K except those between 5K-1 and 7K1 (primary devices) and remove the "vpc 31" command under port-channel 31
In the Nexus5K, things looks good, this is what I see when I check the status of the vpc
vPC status
id     Port        Status Consistency Reason                     Active vlans
31     Po31        up     success     success                    14-16,24,28
                                                                 -31
However, in the N7K this is what I get. There are not consistency errors, but still the status of the port-channel is down.
vPC status
id   Port      Status Consistency Reason                  Active vlans
31   Po31      down   success     success                    -
sh int po31
port-channel31 is down (inactive)
admin state is up
vPC Status: Up, vPC number: 31
Any ideas what could be wrong? has anyone experienced similar issue?
Any suggestions are welcome.

Could you provide a quick diagram and the output of 'show port-channel summary' on both switches.

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Double sided VPC/enhanced VPC and MST

Hello,
I have some doubts/clarifications regarding MST with VPC--
There are two N7K core switches and four N5K switches and eight N2K.
there will be double sided VPC between N5K and N7K.
there will be enhanced vpn between N5k and n2k.
N7Ks will be connected to fifteen 4500.
Each 4500 will be in a VPC with N7k.
Each 4500 is single homed to 15 catalyst edge switches
Assume MST needs be configured in this network.
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3) No need to hard code root as peer switch command will be used
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so can i just map all vlans to the single instance like instance 1 vlan 1-4094 on all catalysts 4500?
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Regards

1) If you are using MST with single region, I don't see the point. It can be done with RPVST+ without any interop worries.
2) Same as 1.
3) This is not true, with peer-switch feature, it is a BP to hard code the N7K as STP root with the same priority value, otherwise, the smallest switch ID will be the root. In you case, most likely the oldest switch will become the root if you don't hard code it.
To your second set of questions:
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HTH,
jerry

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I have 2 pair of 5k connected in double side vpc configuration. can i connect one more pair of 5k to the existing domain ?

Hi,
I don't see any issue with double sides vPC between two pairs of 5Ks. I think, the reason you don't see it often is because usually you have a set of 5ks with vPC as layer-2 and a set of 7Ks as layer-2/3. Of course you could use a second set of 5Ks in place of 7Ks and use them as layer-2/3. This is with daughter cards installed on 5Ks.
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I´m planning the configuration for 2 N7k using the following network diagram:

Hello Clark, thanks but this is not my case, I have 2 N7k, with 2 VDC on each, so I'll create a vPC from Core Switches and another vPC from Aggregation Switches, and my question is for vPC domain ID for each vPC configured.
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I have just installed Officejet Pro 8600 plus. My iMac is running on OS X 10.9.2
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Hello xxzz,
Welcome to the HP Forums.
I see that the flip on long edge option is greyed out for you when you try to print double sided. I will try to help you with this.
Usually if an option is greyed out, it indicates that the software wasn't installed completely or correctly. That or the printer isn't capable of the task. Knowing that this printer is able to duplex, it could be a problem with the software/drivers.
Try the following.
Uninstall the software.
Reset the print system.
Verify/Repair disk permissions
Re-install the software - software download
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Let me know how things go, thank you for posting on the HP Forums.
I worked on behalf of HP.

PIXMA MG6320 Double Sided Business Cards Not Printing Correctly

I just set up and used the PIXMA MG6320 for the first time. Prints regular prints fine but I tried to use inkjet double sided business cards and something when very wrong. The paper seems the same on both sides. The brand is Avery. Side one prints great but side two prints as if there is a plastic finish on the paper. I left the ink to dry over night and it never did. Also, the image is terrible when it does print. As if its on a slippy surface but the paper seems the same flat finsih on both sides. Its not about double sided printing becasue when I sent side 2 through first, it did the same thing.

First of all double sided printing set-up from Illustrator is something that is very specific to the printer you are using, so you'd need to refer to your printer's user documentation to review the correct settings. Having said that the steps you take are very similar for all printers.
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Cari

Cannot print double-sided from Adobe Acrobat Professional 8.1.2

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HP Officejet Pro 7680 and double-sided printing

I just got this yesterday, but I cannot get this to print double-sided in my Macbook Pro (10.5.1). I checked the feature in the printing preference (system preference), but the double-sided option in the print dialog is always grayed out on all applications.
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Message was edited by: ksrhee24
Message was edited by: ksrhee24

I'm updating this so that others can benefit from my experience.
I got everything working now-duplexing, scanning, etc.
I found the beta scanning software on the forum, and installed it. It works. I can scan multiple pages using the ADF w/o any problem.
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I found the HPsuppliesTools.app in my Library/printer folder and deleted it. No more error messages.
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Thanks for HP folks to post things on this forum!

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A

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http://h30434.www3.hp.com/t5/Mac-printing-and-scanning/HP-Color-Laser-Jet-3600dn -unresponsive-in-Snow-Leopard/td-p/115982/page/2
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Ask the Expert: Different Flavors and Design with vPC on Cisco Nexus 5000 Series Switches

Welcome to the Cisco® Support Community Ask the Expert conversation. This is an opportunity to learn and ask questions about Cisco® NX-OS.
The biggest limitation to a classic port channel communication is that the port channel operates only between two devices. To overcome this limitation, Cisco NX-OS has a technology called virtual port channel (vPC). A pair of switches acting as a vPC peer endpoint looks like a single logical entity to port channel attached devices. The two devices that act as the logical port channel endpoint are actually two separate devices. This setup has the benefits of hardware redundancy combined with the benefits offered by a port channel, for example, loop management.
vPC technology is the main factor for success of Cisco Nexus® data center switches such as the Cisco Nexus 5000 Series, Nexus 7000 Series, and Nexus 2000 Series Switches.
This event is focused on discussing all possible types of vPC along-with best practices, failure scenarios, Cisco Technical Assistance Center (TAC) recommendations and troubleshooting
Vishal Mehta is a customer support engineer for the Cisco Data Center Server Virtualization Technical Assistance Center (TAC) team based in San Jose, California. He has been working in TAC for the past 3 years with a primary focus on data center technologies, such as the Cisco Nexus 5000 Series Switches, Cisco Unified Computing System™ (Cisco UCS®), Cisco Nexus 1000V Switch, and virtualization. He presented at Cisco Live in Orlando 2013 and will present at Cisco Live Milan 2014 (BRKCOM-3003, BRKDCT-3444, and LABDCT-2333). He holds a master’s degree from Rutgers University in electrical and computer engineering and has CCIE® certification (number 37139) in routing and switching, and service provider.
Nimit Pathak is a customer support engineer for the Cisco Data Center Server Virtualization TAC team based in San Jose, California, with primary focus on data center technologies, such as Cisco UCS, the Cisco Nexus 1000v Switch, and virtualization. Nimit holds a master's degree in electrical engineering from Bridgeport University, has CCNA® and CCNP® Nimit is also working on a Cisco data center CCIE® certification While also pursuing an MBA degree from Santa Clara University.
Remember to use the rating system to let Vishal and Nimit know if you have received an adequate response.
Because of the volume expected during this event, Vishal and Nimit might not be able to answer every question. Remember that you can continue the conversation in the Network Infrastructure Community, under the subcommunity LAN, Switching & Routing, shortly after the event. This event lasts through August 29, 2014. Visit this forum often to view responses to your questions and the questions of other Cisco Support Community members.

Hello Gustavo
Please see my responses to your questions:
Yes almost all routing protocols use Multicast to establish adjacencies. We are dealing with two different type of traffic –Control Plane and Data Plane.
Control Plane: To establish Routing adjacency, the first packet (hello) is punted to CPU. So in the case of triangle routed VPC topology as specified on the Operations Guide Link, multicast for routing adjacencies will work. The hellos packets will be exchanged across all 3 routers and adjacency will be formed over VPC links
http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/operations/n5k_L3_w_vpc_5500platform.html#wp999181
Now for Data Plane we have two types of traffic – Unicast and Multicast.
The Unicast traffic will not have any forwarding issues, but because the Layer 3 ECMP and port channel run independent hash calculations there is a possibility that when the Layer 3 ECMP chooses N5k-1 as the Layer 3 next hop for a destination address while the port channel hashing chooses the physical link toward N5k-2. In this scenario,N5k-2 receives packets from R with the N5k-1 MAC as the destination MAC.
Sending traffic over the peer-link to the correct gateway is acceptable for data forwarding, but it is suboptimal because it makes traffic cross the peer link when the traffic could be routed directly.
For that topology, Multicast Traffic might have complete traffic loss due to the fact that when a PIM router is connected to Cisco Nexus 5500 Platform switches in a vPC topology, the PIM join messages are received only by one switch. The multicast data might be received by the other switch.
The Loop avoidance works little different across Nexus 5000 and Nexus 7000.
Similarity: For both products, loop avoidance is possible due to VSL bit
The VSL bit is set in the DBUS header internal to the Nexus.
It is not something that is set in the ethernet packet that can be identified. The VSL bit is set on the port asic for the port used for the vPC peer link, so if you have Nexus A and Nexus B configured for vPC and a packet leaves Nexus A towards Nexus B, Nexus B will set the VSL bit on the ingress port ASIC. This is not something that would traverse the peer link.
This mechanism is used for loop prevention within the chassis.
The idea being that if the port came in the peer link from the vPC peer, the system makes the assumption that the vPC peer would have forwarded this packet out the vPC-enabled port-channels towards the end device, so the egress vpc interface's port-asic will filter the packet on egress.
Differences: In Nexus 5000 when it has to do L3-to-L2 lookup for forwarding traffic, the VSL bit is cleared and so the traffic is not dropped as compared to Nexus 7000 and Nexus 3000.
It still does loop prevention but the L3-to-L2 lookup is different in Nexus 5000 and Nexus 7000.
For more details please see below presentation:
https://supportforums.cisco.com/sites/default/files/session_14-_nexus.pdf
DCI Scenario: If 2 pairs are of Nexus 5000 then separation of L3/L2 links is not needed.
But in most scenarios I have seen pair of Nexus 5000 with pair of Nexus 7000 over DCI or 2 pairs of Nexus 7000 over DCI. If Nexus 7000 are used then L3 and L2 links are required for sure as mentioned on above presentation link.
Let us know if you have further questions.
Thanks,
Vishal

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Hi,
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Double-sided vpc Nexus7K and NExus 5K

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