Do I need flow control for ZX gigabit ethernet trunk?

Unanswered Question
Apr 23rd, 2008
User Badges:


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?


Fredrik Hofgren

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
sdrossen2 Wed, 04/23/2008 - 06:00
User Badges:

What is the committed rate on the leased line?

hoffa2000 Wed, 04/23/2008 - 06:59
User Badges:

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


padramas Wed, 04/23/2008 - 15:18
User Badges:
  • Cisco Employee,

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




This Discussion