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port channel and portfast

I need to connect a Netscalar Load Balancer to a Cisco 6500 switch via two ethernet (100Mbps/1Gbps) between them. I will be configuring the two uplink ports using set port channel command on the Cisco side. Due to the load balancer, I also have to configure the two uplink ports with portfast enabled.

Wanted to know if this will cause any loop between the two switches? There are other switch-load balancer connections already configured where both port channel (etherchannel) and portfast are enabled between two uplink ports. But I was not involved when the configuration was made. Please advise. Also, should I configure port channel first, and then enable portfast, or it does not matter in what order I enable the two changes.

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Accepted Solutions
Cisco Employee

Re: port channel and portfast

Hi Friend,

AFAIK it is good to configure port channel first and make them work as a single logical bundle interface so that a single STP instance will run for that bundled interface.

Once its a single bundle interface then you can enable Spanning Tree PORTFAST and it will work fine because after port channel its a single logical interface and one spanning tree instance will work for the same.

HTH

Ankur

*Pls rate helpfull post

1 REPLY
Cisco Employee

Re: port channel and portfast

Hi Friend,

AFAIK it is good to configure port channel first and make them work as a single logical bundle interface so that a single STP instance will run for that bundled interface.

Once its a single bundle interface then you can enable Spanning Tree PORTFAST and it will work fine because after port channel its a single logical interface and one spanning tree instance will work for the same.

HTH

Ankur

*Pls rate helpfull post

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