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Cisco 3750 Stack - Port-Channel

Hi,

I am trying to setup two Cisco 3750 Switches which are stacked:

hq-3750-stack1#show switch
Switch/Stack Mac Address : 001d.45b6.bd80
H/W Current
Switch# Role Mac Address Priority Version State
----------------------------------------------------------
*1 Master 001d.45b6.bd80 15 0 Ready
2 Member 0023.05c5.e480 14 0 Ready

I've got my config on and created Port-Channel 1 for a 2Gb Uplink, as follows:

interface GigabitEthernet1/0/4
description Fibre to core1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,5,16-24,32,40,43,44,56,72,82,83,96-98,100,101
switchport mode trunk
switchport nonegotiate
srr-queue bandwidth share 1 30 35 5
priority-queue out
mls qos trust cos
auto qos trust
channel-group 1 mode active

interface GigabitEthernet2/0/4
description Fibre to core1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,5,16-24,32,40,43,44,56,72,82,83,96-98,100,101
switchport mode trunk
switchport nonegotiate
srr-queue bandwidth share 1 30 35 5
priority-queue out
mls qos trust cos
auto qos trust
channel-group 1 mode active

interface Port-channel1
logging event bundle-status

Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(SU) LACP Gi1/0/4(D) Gi2/0/4(P)

The config on the core is as follows:

interface Port-channel16
switchport trunk encapsulation dot1q
switchport mode trunk
logging event bundle-status

interface GigabitEthernet1/0/28
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 16 mode active

interface GigabitEthernet2/0/28
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 16 mode active

16 Po16(SU) LACP Gi1/0/28(D) Gi2/0/28(P)

The core is a 3750G

Port Gi1/0/28(D) comes up then goes down and sometimes goes into a Hot-Standby or just Down.

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

I've been looking at this but keep seeing the port flap:

hq-3750-stack1(config-if)#
Oct 20 20:46:13.056 bst: %LINK-5-CHANGED: Interface GigabitEthernet1/0/4, changed state to administratively down
hq-3750-stack1(config-if)#shut
hq-3750-stack1(config-if)#no shut
hq-3750-stack1(config-if)#
Oct 20 20:46:25.304 bst: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/4, changed state to up
hq-3750-stack1(config-if)#
Oct 20 20:46:26.386 bst: %PM-4-ERR_DISABLE: link-flap error detected on Gi1/0/4, putting Gi1/0/4 in err-disable state
hq-3750-stack1(config-if)#
Oct 20 20:46:28.013 bst: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/4, changed state to down
hq-3750-stack1(config-if)#

Any ideas?

ASKER CERTIFIED SOLUTION

Predrag Jovic

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Ian Taylor

ASKER

Thanks, I'm thinking the same

I will check the cables and gbic

Garry Glendown

What does "po1" config look like on the stack? err-disable usually rather happens when there is a mismatch in port configuration ...
Is the second port up and does the port channel show the 1G speed?

Ian Taylor

ASKER

I re applied the configure last night for all ports which match and gi1/0/4 came up but then went down due to errdisable

Ian Taylor

ASKER

I re applied the configure last night for all ports which match and gi1/0/4 came up but then went down due to errdisable

Garry Glendown

So g2/0/4 is up and stayed up? What does the first couple lines of "show int po1" and "show int po16" give you? How does "show int g1/0/4" look when it's err-disabled?