CRC errors on fibre port between 6509 and 3750

markc.williams · ‎03-31-2008

Hi all.

I'm having an issue all our 3750's (45 in total) connected to our 6509's (CatOS).

The 3750's are connected to the 6509s via fibre. on G1/0/1 and G1/0/4, using flexlink, G1/0/1 is that active link

On every switch, G1/0/1 shows input/CRC errors.... the 6509 doesnt show any output errors

It increments by one every 30 seconds.

from 3750:

5 minute output rate 2000 bits/sec, 2 packets/sec

125097 packets input, 40908607 bytes, 0 no buffer

Received 121817 broadcasts (0 multicast)

0 runts, 0 giants, 0 throttles

113 input errors, 113 CRC, 0 frame, 0 overrun, 0 ignored

from the 6509:

(enable) sh port counters 7/13

Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize

----- ---------- ---------- ---------- ---------- ---------

7/13 0 0 0 0 0

Port Single-Col Multi-Coll Late-Coll Excess-Col Carri-Sen Runts Giants

----- ---------- ---------- ---------- ---------- --------- --------- ---------

7/13 0 0 0 0 0 0 -

Port Last-Time-Cleared

----- --------------------------

config on 3750:

interface GigabitEthernet1/0/1

switchport trunk encapsulation dot1q

switchport trunk allowed vlan 1,10,555,600

switchport mode trunk

switchport nonegotiate

switchport backup interface Gi1/0/4

udld port aggressive

I've test new fibre, new SFP and Gbics.

Disable CDP.. but still getting errors

any help would be appreciated

lamav · ‎04-04-2008

Mark:

What are your speed and duplex settings on both ends?

Do you auto-negotiate or hard code?

Are you consistent?

Carl Andress · ‎08-17-2013

Mark, just curious if you found a solution to this. I have also seen this behavior, I'm not sure what's causing it.

jawad-mukhtar · ‎08-18-2013

u can check same fiber on other port and then check if u recieving crc. if this is confirmed.

Jawad

paolo bevilacqua · ‎08-18-2013

You are responding to a 5 years old thread. People has move on since then.