Hi all,
I have a problem with LACP redundency that i can't figure up,
I have 2 3750X (Cisco IOS Software, C3750E Software (C3750E-UNIVERSALK9NPE-M), Version 15.0(2)SE5, RELEASE SOFTWARE (fc1)) switches that are connected with stuck,
Both switches are connected redundantly to 2 Cisco UCS 6248UP switches, all switches configured to LACP TRUNKs with port-channels, and work perfectly.
But when i'm doing a redundancy test (turning off one of the 3750X switches), at first it looks like every thing works, but after few seconds, the ports of the 3570 switch are shuting down and turnd on again, which causing a ping loss of 8 seconds.
i took the logs from the 3750 swtich, and i can see that the trunk ports (0/1, 0/2) are going administratively down.
Dec 14 07:44:15.719: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel3, changed state to down
Dec 14 07:44:16.080: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel4, changed state to down
Dec 14 07:44:16.676: %LINK-5-CHANGED: Interface GigabitEthernet1/0/1, changed state to administratively down
Dec 14 07:44:16.743: %LINK-3-UPDOWN: Interface Port-channel3, changed state to down
Dec 14 07:44:17.036: %LINK-5-CHANGED: Interface GigabitEthernet1/0/2, changed state to administratively down
Dec 14 07:44:17.120: %LINK-3-UPDOWN: Interface Port-channel4, changed state to down
Dec 14 07:44:17.699: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/1, changed state to down
Dec 14 07:44:18.060: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/2, changed state to down
Dec 14 07:44:19.477: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/1, changed state to down
Dec 14 07:44:19.477: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/2, changed state to down
Dec 14 07:44:21.784: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/1, changed state to up
Dec 14 07:44:21.826: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/2, changed state to up
Dec 14 07:44:27.731: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/1, changed state to up
Dec 14 07:44:28.117: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/2, changed state to up
Dec 14 07:44:28.687: %LINK-3-UPDOWN: Interface Port-channel3, changed state to up
Dec 14 07:44:29.073: %LINK-3-UPDOWN: Interface Port-channel4, changed state to up
Dec 14 07:44:29.694: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel3, changed state to up
Dec 14 07:44:30.088: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel4, changed state to up
may any one know the reason for that? is there any solusion for that issue?
thanks
dima
