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New Member

Nexus portfast and bpdguard

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

Everyone's tags (3)
1 ACCEPTED SOLUTION

Accepted Solutions
VIP Red

Nexus portfast and bpdguard

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

http://www.cisco.com/c/en/us/products/collateral/switches/nexus-5000-series-switches/configuration_guide_c07-543563.html

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?

xxx.png

This is the default !

3 REPLIES
VIP Red

Nexus portfast and bpdguard

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

New Member

Nexus portfast and bpdguard

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

VIP Red

Nexus portfast and bpdguard

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

http://www.cisco.com/c/en/us/products/collateral/switches/nexus-5000-series-switches/configuration_guide_c07-543563.html

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?

xxx.png

This is the default !

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