03-02-2014 03:47 AM - edited 03-01-2019 11:33 AM
SW HW INFO:
UCS B200MII
Nexus 5K
PVS 7.1
XD 7.1
http://support.citrix.com/article/CTX123158
According to that link, I need to enable portfast and disable bpdguard in Cisco and Nexus
My friend argument, no need to enable portfast because pvs and win7 vm all using vnic, which there are no user unplug nic on physical port.
Is that true?
If false then do I need to globally enable portfast and disable bpdguard on core sw and nexus
thanks
Solved! Go to Solution.
03-02-2014 05:23 AM
Sorry, I was not clear, see inline below
Q1. no need to enable portfast because pvs and win7 vm all using vnic
A. your answer is yes here, that mean no need to enable portfast
yes, but if you do, it doesn't matter
I am only referring to the network between UCS fabric interconnect and N5k
see eg. https://supportforums.cisco.com/thread/2070841
There's no spanning tree in UCS EHM running below your uplinks so you can safely utilize Port Fast.
Portfast should only be enabled on ports connected to a single host. Connecting hubs, concentrators, switches, bridges, etc... to this interface when portfast is enabled, can cause temporary bridging loops.
Please refer to for setting up a vpc
Q2. do I need to globally enable portfast and disable bpdguard on core sw and nexus
In my interpretation, no need to enable global portfast and disable bpdguard on core sw and nexus
Is your question global or per interface ?? I would definitely do it per interface.
How do I verify End Host Mode in FI is used or not?
This is the default !
03-02-2014 04:14 AM
Best practise: use vPC between UCS fabric interconnect and N5K
http://www.youtube.com/watch?v=-nCxa-chEVk
And yes: vnic talks to a veth interface on the fabric interconnect, which of course is bound to a physical interface (on the FI)
No SPT, if EHM is used on fabric interconnect
03-02-2014 04:42 AM
Hi wdey
I am new here, please correct me if my understanding is wrong.
Q1. no need to enable portfast because pvs and win7 vm all using vnic
A. your answer is yes here, that mean no need to enable portfast
Q2. do I need to globally enable portfast and disable bpdguard on core sw and nexus
A. you said
No SPT, if EHM is used on fabric interconnect
In my interpretation, no need to enable global portfast and disable bpdguard on core sw and nexus
If not in global, then do I need to enable portfast and disable bpduguard per interface
How do I verify End Host Mode in FI is used or not?
tq
03-02-2014 05:23 AM
Sorry, I was not clear, see inline below
Q1. no need to enable portfast because pvs and win7 vm all using vnic
A. your answer is yes here, that mean no need to enable portfast
yes, but if you do, it doesn't matter
I am only referring to the network between UCS fabric interconnect and N5k
see eg. https://supportforums.cisco.com/thread/2070841
There's no spanning tree in UCS EHM running below your uplinks so you can safely utilize Port Fast.
Portfast should only be enabled on ports connected to a single host. Connecting hubs, concentrators, switches, bridges, etc... to this interface when portfast is enabled, can cause temporary bridging loops.
Please refer to for setting up a vpc
Q2. do I need to globally enable portfast and disable bpdguard on core sw and nexus
In my interpretation, no need to enable global portfast and disable bpdguard on core sw and nexus
Is your question global or per interface ?? I would definitely do it per interface.
How do I verify End Host Mode in FI is used or not?
This is the default !
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