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Community Member

CRC errors on fibre port between 6509 and 3750

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

4 REPLIES
Blue

Re: CRC errors on fibre port between 6509 and 3750

Mark:

What are your speed and duplex settings on both ends?

Do you auto-negotiate or hard code?

Are you consistent?

Community Member

CRC errors on fibre port between 6509 and 3750

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

CRC errors on fibre port between 6509 and 3750

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

Jawad

Jawad
Hall of Fame Super Gold

CRC errors on fibre port between 6509 and 3750

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

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