Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

what is a Late-Coll

I have a switched port off of a 6509 that keeps incrementing the Late-Coll field. What is this?

3 REPLIES
Anonymous
N/A

Re: what is a Late-Coll

To allow collision detection to work properly, the time period in which collisions are detected is restricted (512 bit-times). For Ethernet, this is 51.2us (microseconds), and for Fast Ethernet, 5.12us. For Ethernet stations, collisions can be detected up to 51.2 microseconds after the beginning of the transmission, or in other words: up to the 512th bit of the frame.

When a collision is detected by a station after it has sent the 512th bit of its frame, this is counted as a late collision.

Note that the station reporting the late collision is merely indicating the problem; it is generally not the cause of the problem. Possible causes are usually incorrect cabling or a non-compliant number of hubs in the network. Bad network interface cards (NICs) can also cause late collisions.

New Member

Re: what is a Late-Coll

Reference url

http://www.cisco.com/warp/public/86/10.html

^^; good luck!

New Member

Re: what is a Late-Coll

Reference url

http://www.cisco.com/warp/public/86/10.html

^^; good luck!

105
Views
0
Helpful
3
Replies
CreatePlease login to create content