Someone showed me a document offline. I like your approach. Thanks for
the hint.
Data Center Access Design with Cisco Nexus 5000 Series Switches and 2000 Series
Fabric Extenders and Virtual PortChannels
http://www.cisco.com/en/US/prod/collateral/switches/ps9441/ps9670/C07-572829-01_Design_N5K_N2K_vPC_DG.pdf
-Hammer-
"I was a normal American nerd"
-Jack Herer
On 2/15/2012 9:16 AM, Bielawa, Daniel Walter wrote:
For our N5k/N2k implementation, we choose to have our servers use port channels
(via vPC) to connect to the N2k, and to then have an outbound vPC from our
N5k's, instead of a vPC connecting the N2k's.
Thank You
Daniel Bielawa
Network Engineer
Liberty University Network Services
(434)592-7987
LIBERTY UNIVERSITY
40 Years of Training Champions for Christ: 1971-2011
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of -Hammer-
Sent: Wednesday, February 15, 2012 9:53 AM
To: [email protected]
Subject: [c-nsp] Nexus FEXs and pinning max-links
All,
I've been playing with some Nexus gear in our lab and I'm confused on a
physical layer issue. When defining the FEX, you define the max-links.
Originally I set it to four and then built my port channel.
Of course, it gave me an error
ERROR: FEX max-links not configured to be one
Which after googling and thinking thru makes sense. I'm defining the ports as a port channel so I
need a max-links of "one". Not "four" (as in four wires between the N5K and
N2K). That makes sense. What I'm struggling with is in what scenario I would NOT create a port
channel.
When would I just assign the physical links to the FEX and not build an
etherchannel for them? Anyone?
!!!get your FEX on
!!!! define a FEX
fex 101
desc FEX101
!!! define maximum links!
!!! trick question! If the link is a PO then your max links is 1.
pinning max-links 1
!!!! define the port channel
interf po101
!!! MODE!
switch mod fex-fabric
!!! associate it with the logical FEX
fex asso 101
!!!! Bring the physicals (with the FETs connected) into the PO101 interf ra
e2/1 - 4
!!! MODE!
switch mode fex-fabric
!!! call the fex!
fex ass 101
!!! call the PO
channel-group 101
no shut
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