Solved

NEXUS VPC PEER-LINK

Posted on 2014-01-22
8
378 Views
Last Modified: 2014-01-24
It is my understanding that the peer link is used for control traffic and that data traffic should not cross the peer-link.   I also understand that traffic that enters on a VPC on one chassis and then crosses the peer-link cannot leave the second chassis on a VPC.

Now the question.

Assuming that traffic has entered Chassis A on a VPC and then crossed the peer link to Chassis B.  Will the traffic be forwarded if the egress port of Chassis B is not configured for VPC but is just an orphan port????
0
Comment
Question by:sectel
  • 4
  • 3
8 Comments
 
LVL 26

Expert Comment

by:Soulja
ID: 39801181
Any traffic that enters a vpc on one chassis will not cross the peer link, it will exit another VPC on the other chassis..
0
 
LVL 50

Expert Comment

by:Don Johnston
ID: 39802972
Will the traffic be forwarded if the egress port of Chassis B is not configured for VPC but is just an orphan port????
Yes
0
 
LVL 26

Expert Comment

by:Soulja
ID: 39803242
DonJohnston, can you expound? Maybe I am reading the question wrong, but based on below:


Assuming that traffic has entered Chassis A on a VPC and then crossed the peer link to Chassis B.  Will the traffic be forwarded if the egress port of Chassis B is not configured for VPC but is just an orphan port????

My understanding is since the VPC is connected to both chassis, the traffic would never have to cross the peer link. The traffic would go directly to up the link to chassis B and exit to the host connected to the orphan port.
0
 

Author Comment

by:sectel
ID: 39803347
Incorrect - the vpc makes the Upstream 7K pair as a single chassis, hence traffic originating from the source will be load balanced based on a hashing mechanism.  With one 10 gig link connecting to one chassis and the second connecting to the second chassis or chassis B, there is a 50 percent chance that the traffic may end up on Chassis B and thus have to cross the peer-link assuming that the upstream destination is only connected to a single orphan port on chassis A.
0
Control application downtime with dependency maps

Visualize the interdependencies between application components better with Applications Manager's automated application discovery and dependency mapping feature. Resolve performance issues faster by quickly isolating problematic components.

 
LVL 50

Assisted Solution

by:Don Johnston
Don Johnston earned 250 total points
ID: 39803370
My understanding is since the VPC is connected to both chassis, the traffic would never have to cross the peer link.
No. There is very little data traffic crossing the peer link. Mostly broadcast, multicast and unknown unicast.
0
 
LVL 26

Accepted Solution

by:
Soulja earned 250 total points
ID: 39803420
Ah, okay. That clears my misunderstanding and makes sense regarding the LACP channel.
0
 
LVL 26

Expert Comment

by:Soulja
ID: 39805628
Thanks for the points but they definitely should have gone to Don since my answer was incorrect.
0
 
LVL 50

Expert Comment

by:Don Johnston
ID: 39806285
Thank you.  That alone is worth more than the points!
0

Featured Post

What is SQL Server and how does it work?

The purpose of this paper is to provide you background on SQL Server. It’s your self-study guide for learning fundamentals. It includes both the history of SQL and its technical basics. Concepts and definitions will form the solid foundation of your future DBA expertise.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
ACS vs NAC 2 72
Multiple Static IP addresses on Router 14 106
FMX TCameraComponent Problem 2 52
assessment of laptops/desktops for hardware refresh 6 46
This article is a how to to configure a UCS Ethernet-uplink portchannel via the console. It is easy to do and can be done quite quickly. In certain versions of the UCS manager the portchannel has issues coming up and this is a workaround. I am…
This is used to tweak the memory usage for your computer, it is used for servers more so than workstations but just be careful editing registry settings as it may cause irreversible results. I hold no responsibility for anything you do to the regist…
Video by: Mark
This lesson goes over how to construct ordered and unordered lists and how to create hyperlinks.

895 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

14 Experts available now in Live!

Get 1:1 Help Now