Discards on Cisco Switches

I am receiving discards and CRC errors on some interfaces in a port group

First off, the Gi1/ interfaces

LKS-CORE-002#sho interfaces counters errors

Port       CrcAlign-Err Dropped-Bad-Pkts Collisions   Symbol-Err
Gi1/1          28747235                0          0   2169382389
Gi1/2                 0                0          0            0
Gi2/1                 0                0          0       629850
Gi2/2                 0                0          0       670140
Gi2/3                 0                0          0       732870
Gi2/4                 0                0          0       620925
Gi2/5                 0                0          0      1273215
Gi2/6                 0                0          0       748935
Gi3/1                 0                0          0            0
Gi3/2                 0                0          0            0
Gi3/3                 0                0          0            0
...
Po1            28747262                0          0   2169382839

#The Port Group

interface Port-channel1
 switchport
 switchport trunk encapsulation dot1q
 switchport mode dynamic desirable
 qos vlan-based
 qos trust cos
!

#The interfaces on LKS-CORE-002

interface GigabitEthernet1/1
 description ** Connected to LKS-CORE-001  Gig 1/1 **
 switchport trunk encapsulation dot1q
 switchport mode dynamic desirable
 service-policy output autoqos-voip-policy
 qos trust cos
 auto qos voip trust
 tx-queue 3
   bandwidth percent 33
   priority high
   shape percent 33
 channel-group 1 mode on
!
interface GigabitEthernet1/2
 description ** Connected to LKS-CORE-001 Gig 1/2 **
 switchport trunk encapsulation dot1q
 switchport mode dynamic desirable
 service-policy output autoqos-voip-policy
 qos trust cos
 auto qos voip trust
 tx-queue 3
   bandwidth percent 33
   priority high
   shape percent 33
 channel-group 1 mode on

-------- The Other Core -------
LKS-CORE-001#sho interfaces counters errors

Port       CrcAlign-Err Dropped-Bad-Pkts Collisions   Symbol-Err
Gi1/1                 0                0          0         1530
Gi1/2                 0                0          0         1530
Gi2/1                 0                0          0       630105
Gi2/2                 0                0          0       648210
Gi2/3                 0                0          0       743325
Gi2/4                 0                0          0       965685
Gi2/5                 0                0          0      1230375
.....
Po1                   0                0          0         3060

#The Port Group

interface Port-channel1
 switchport
 switchport trunk encapsulation dot1q
 switchport mode dynamic desirable
 qos vlan-based
 qos trust cos
!

#The Interfaces on LKS-CORE-001

interface Port-channel1
 switchport
 switchport trunk encapsulation dot1q
 switchport mode dynamic desirable
 qos vlan-based
 qos trust cos
!
interface GigabitEthernet1/2
 description ** Connected to LKS-CORE-002 Gig 1/2 **
 switchport trunk encapsulation dot1q
 switchport mode dynamic desirable
 service-policy output autoqos-voip-policy
 qos trust cos
 auto qos voip trust
 tx-queue 3
   bandwidth percent 33
   priority high
   shape percent 33
 channel-group 1 mode on
!

These are fibre connections between the two core switches. If this was copper I would check the speed/duplex etc to be 1000/full and force the speed on all ports. I am not sure what I am supposed to do with fibre connections?

Secondly the Gi2/ interfaces - also Fibre, these are going to the user switches

#LKS-CORE-002
interface GigabitEthernet2/1
 description Uplink to LKS-T2S1-SW3-013
 switchport trunk encapsulation dot1q
 switchport mode dynamic desirable
 service-policy output autoqos-voip-policy
 qos trust cos
 auto qos voip trust
 tx-queue 3
   bandwidth percent 33
   priority high
   shape percent 33
!
interface GigabitEthernet2/2
 description Uplink to LKS-T2S2-SW6-016
 switchport trunk encapsulation dot1q
 switchport mode dynamic desirable
 service-policy output autoqos-voip-policy
 qos trust cos
 auto qos voip trust
 tx-queue 3
   bandwidth percent 33
   priority high
   shape percent 33
!
interface GigabitEthernet2/3
 description Uplink to LKS-KINGS-SW3-019
 switchport trunk encapsulation dot1q
 switchport mode dynamic desirable
 service-policy output autoqos-voip-policy
 qos trust cos
 auto qos voip trust
 tx-queue 3
   bandwidth percent 33
   priority high
   shape percent 33
!
interface GigabitEthernet2/4
 description Uplink to LKS-T3S1-SW9-022
 switchport trunk encapsulation dot1q
 switchport mode dynamic desirable
 service-policy output autoqos-voip-policy
 qos trust cos
 auto qos voip trust
 tx-queue 3
   bandwidth percent 33
   priority high
   shape percent 33
!

and so on....

#LKS-CORE-001
interface GigabitEthernet2/1
 description Uplink to LKS-T2S2-SW1-011
 switchport trunk encapsulation dot1q
 switchport mode dynamic desirable
 service-policy output autoqos-voip-policy
 qos trust cos
 auto qos voip trust
 tx-queue 3
   bandwidth percent 33
   priority high
   shape percent 33
!
interface GigabitEthernet2/2
 description Uplink to LKS-T2S2-SW4-014
 switchport trunk encapsulation dot1q
 switchport mode dynamic desirable
 service-policy output autoqos-voip-policy
 qos trust cos
 auto qos voip trust
 tx-queue 3
   bandwidth percent 33
   priority high
   shape percent 33
!
interface GigabitEthernet2/3
 description Uplink to LKS-KINGS-SW1-017
 switchport trunk encapsulation dot1q
 switchport mode dynamic desirable
 service-policy output autoqos-voip-policy
 qos trust cos
 auto qos voip trust
 tx-queue 3
   bandwidth percent 33
   priority high
   shape percent 33
!
interface GigabitEthernet2/4
 description Uplink to LKS-T3S1-SW7-020
 switchport trunk encapsulation dot1q
 switchport mode dynamic desirable
 service-policy output autoqos-voip-policy
 qos trust cos
 auto qos voip trust
 tx-queue 3
   bandwidth percent 33
   priority high
   shape percent 33
!
interface GigabitEthernet2/5
 description Uplink to LKS-T3S2-SW10-023
 switchport trunk encapsulation dot1q
 switchport mode dynamic desirable
 service-policy output autoqos-voip-policy
 qos trust cos
 auto qos voip trust
 tx-queue 3
   bandwidth percent 33
   priority high
   shape percent 33
!
and so on....

So, in summary I am experiencing discards on my fibre uplink ports between the user switches and the interconnect between the two core switches

help please :)
LVL 1
itinfservAsked:
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SIM50Commented:
I would try and hard code the speed and duplex on the interfaces which belong to the etherchannel. Also, why did you leave native vlan to be the default 1? Is it only used for the trunk ports?

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SIM50Commented:
Sorry, I take back my comment. I missed your paragraph in the middle about the fiber links.
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