PAgP suspended and stand-alone status

[motiar]

Hello,

I am facing the folloing problem: one port in an etherchannel (PAgP) between two c4500 Switche goes suddenly into stand-alone and suspended respectedly, while it was working fine some time ago. 

Do you have any suggestion, why the ports are one side suspended and the other side is stand-alone?

Attached you are getting the ports and etherchannel configurations. 

regards

Motiar

[Georg Pauwen]

Hello,

the configs look good actually. The only thing that could possibly form a problem is that Cisco recommends to put any storm control only on the port channel interface. So you might want to try to remove:

storm-control broadcast level 5.00 3.00

from all physical interfaces...

[motiar]

Hi Georg,

Thank you for your advice. I did try to remove to the storm-control from the physical interfaces, but did not work. Finally I took the the following steps and after my two days investment I got the result. 

Switch#sh etherch su

Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------
5  Po5(SU)  PAgP  Gi1/1(s)  Gi1/2(P)
7  Po7(SU)  PAgP  Gi1/1(I)  Gi1/2(P)

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

Step 1#
default int ra Gi1/1-2

no int po5 / po7

int ra Gi1/1-2
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 300-319
switchport mode trunk
switchport nonegotiate
channel-group 7 mode desirable
channel-protocol pagp

--------------------------------------------
Step 2#
int po5
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 300-319
switchport mode trunk
switchport nonegotiate
qos trust dscp
storm-control broadcast level 5.00

------------------------------------------------
Step 3#
int ra Gi1/1-2
tx-queue 1
bandwidth percent 75
tx-queue 2
bandwidth percent 5
tx-queue 3
bandwidth percent 20
priority high
shape percent 20

-------------------------------------------
Switch#sh run int Gi1/1
interface GigabitEthernet1/1
description to PO5
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 300-319
switchport mode trunk
switchport nonegotiate
qos trust dscp
storm-control broadcast level 5.00
tx-queue 1
bandwidth percent 75
tx-queue 2
bandwidth percent 5
tx-queue 3
bandwidth percent 20
priority high
shape percent 20
channel-protocol pagp
channel-group 5 mode desirable

Switch#sh etherch su

Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------
5  Po5(SU)  PAgP  Gi1/1(P)  Gi1/2(P)
7  Po7(SU)  PAgP  Gi1/1(P)  Gi1/2(P)

[balaji.bandi]

@Georg Pauwen  agree with him, we have seen many use case strom control shutdown the ports. you can remove and once the port-channel up you can put back if required, it generally not required. (i have seen many traditional one deployed 10years back this config all over).