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Webcast-Catalyst9k
New Member

configuring trunk on Sup720

I have a 6513 witha sup720. I want to configure the gig ports (7/1 and 7/2) as trunk ports to connect to a 6509 with a sup2 cards. Does anyone know how to do this? Do I need to configure port-channels

2 REPLIES
New Member

Re: configuring trunk on Sup720

In Cisco's terminology, trunking refers to the concept of links carrying multiple vlans across whereas channelling refers to bundling the links to behave as a single logical interface.

I am aware that other vendors out there sometimes call 'trunking' for what we call channelling and that MAY result in some confusion in the field.

So, in your case, you dont 'need' to configure port-channels on your two cat6k boxes but be aware that if you don't then spanning-tree would see them as individual links and block a port on one link to stop a loop in your L2 network. That is why, you may consider etherchannels also in your deployment.

In a nutshell, trunking can be turned ON by "switchport mode trunk" command under the interface and channelling can be turned on by issuing "channel=group mode desirable" under the physical interfaces where 'x' is the port-channel number. It is recommended for etherchannels that you first bundle the ports together by forming and etherchannel and THEN configure additional parameters like trunking etc.

here are the links:

Channelling:

CATOS:

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/sw_8_4/confg_gd/channel.htm

IOS:

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/122sx/swcg/channel.htm

Trunking

CATOS:

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/sw_8_4/confg_gd/e_trunk.htm

IOS

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/122sx/swcg/layer2.htm

New Member

Re: configuring trunk on Sup720

hi

you would do something like this

int gi7/1

switcport

switchport trunk enca dot1q

switcport mode trunk

thanks

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