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New Member

Do I need flow control for ZX gigabit ethernet trunk?

Greetings

I have two 6513 connected over a 40km ZX GBIC fiber trunk using a lease line. Neither side has flow control enabled but I'm starting to see output drops on the trunk interface from one of the switches.

Would enabling flow control be a good solution here?

Regards

Fredrik Hofgren

3 REPLIES
New Member

Re: Do I need flow control for ZX gigabit ethernet trunk?

What is the committed rate on the leased line?

New Member

Re: Do I need flow control for ZX gigabit ethernet trunk?

The leased line is a "black fiber". To my knowledge the capacity is sufficient for our Gbics

/Fredrik

Cisco Employee

Re: Do I need flow control for ZX gigabit ethernet trunk?

Hello Fredrik,

Output drops occur when the interface gets congested and sometimes due to hardware failure.

Drops can occur during short bursts of data or constant high data rate than output interface line speed.

We have to identify the traffic and how the interface gets congested. The following link provides more info on output drops

http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a0080094791.shtml#topic4

HTH

Padmanabhan

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