Cisco 2600 series COLLISION

[elvis123456789]

What kind of message it is :
Late Collision on int FastEthernet0/0

This show when i monitor interface on router.
Any idea ?

 

[Lemon13]

by cisco

"Late Collisions

To allow collision detection to work properly, the 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 transmission begins, 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, it is counted as a late collision.

Note: The station that reports the late collision merely indicates 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."

http://www.cisco.com/en/US/products...oducts_tech_note09186a008009446d.shtml#topic4

M. Knorr

MCSE, MCTS, MCSA, CCNA

 

[vipergg]

Usually a faulty cable or the actual cable length is too long .

 

[elvis123456789]

OK thnx.
I have a switch in distance 100m that connect my router.
switch port is cfg speed 10 and duplex full.
router port is cfg speed auto and duplex auto.
sometimes the nodes behind the router works very slow.
so what can i do to raise the performance of my traffic ?

 

[unclerico]

both sides of the link either need to be hardcoded 100/Full or left at auto.

I hate all Uppercase... I don't want my groups to seem angry at me all the time! =)
- ColdFlame (vbscript forum)

 

[vipergg]

As unclerico said , the way it is now you have a speed/duplex mismatch which is causing all the collisions . if the router is capable of 10/full then set it as 10/full otherwise set the switchport end as 10/half .

 

[elvis123456789]

i did it and it is ok now
thnx a lot all of you

 

[burtsbees]

Late collisions are indeed mostly caused by speed/duplex mismatches (specifically duplex).

Is there an echo in here?lol

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