12-04-2008 11:47 AM - edited 03-06-2019 02:48 AM
Hello,
I have found several conflicting articles on the internet on this subject, so here goes.
I have 2 ports on a 3750 in a LACP configuration. Both ports are switchports they are both identically configured with a "channel-group 3 mode active". They are connected to a Ubuntu (linux) box with LACP enalbled. One of the 2 ports in the bundle always goes in to suspended. it always seems to be the second one that is plugged in. like so:
EVPRODIDF05#sh ether sum
Flags: D - down P - in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use f - failed to allocate aggregator
u - unsuitable for bundling
w - waiting to be aggregated
d - default port
Number of channel-groups in use: 3
Number of aggregators: 3
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(SD) -
2 Po2(SD) -
3 Po3(SU) LACP Gi3/0/1(P) Gi3/0/4(s)
here is the lacp internal output:
EVPRODIDF05#sh lacp internal
Flags: S - Device is requesting Slow LACPDUs
F - Device is requesting Fast LACPDUs
A - Device is in Active mode P - Device is in Passive mode
Channel group 3
LACP port Admin Oper Port Port
Port Flags State Priority Key Key Number State
Gi3/0/1 SA bndl 32768 0x3 0x3 0x69 0x3D
Gi3/0/4 SA susp 32768 0x3 0x3 0x6C 0x5
I called TAC and the tech could not define why the port went in to suspended mode.
The ubuntu configuration seems to be sound as I can detect LACPDUs comming out of both ports on a port spann.
Any help would be apprecieated.
Thanks,
ed
12-04-2008 01:21 PM
I would try using the interface range command and shut both those ports at the same time and then "no shut" the ports , i have seen where if you don't bring them both up at the same time ports will go into suspend mode.
12-04-2008 01:34 PM
already tried it. No go. thanks for the suggestion though
12-05-2008 04:05 AM
Do you have to specify a VLAN ID on the Linux box ? (is the Linux box maybe tagging the packets ?) If so, you will need to convert the switchports to trunks.
Second, are you ports access ports ? Like this (please post the config of the access port):
int x/x
switchport mode access
switchport access vlan 1
channel-group 3 mode active
12-05-2008 04:06 AM
Do you have to specify a VLAN ID on the Linux box ? (is the Linux box maybe tagging the packets ?) If so, you will need to convert the switchports to trunks.
Second, are you ports access ports ? Like this (please post the config of the access port):
int x/x
switchport mode access
switchport access vlan 1
channel-group 3 mode active
12-05-2008 08:05 AM
here are the configs. there is no vlan tagging on the linux box. the interesting thing is that when we did a packet capture on the nics on the server I saw lacpdu's comming out of the server but not the switch. even if I put the ports in active or passive mode. that just seems like the thing is broken somewhere.
EVPRODIDF05#sh run int g3/0/1
Building configuration...
Current configuration : 143 bytes
!
interface GigabitEthernet3/0/1
switchport access vlan 13
switchport mode access
speed 1000
duplex full
channel-group 3 mode active
end
EVPRODIDF05#sh run int g3/0/4
Building configuration...
Current configuration : 143 bytes
!
interface GigabitEthernet3/0/4
switchport access vlan 13
switchport mode access
speed 1000
duplex full
channel-group 3 mode active
end
EVPRODIDF05#sh run int po3
Building configuration...
Current configuration : 156 bytes
!
interface Port-channel3
switchport access vlan 13
switchport mode access
end
thanks,
ed vazquez
12-06-2008 11:10 AM
Try to disable fixed speed and duplex and enable auto-negotiation.
07-26-2010 01:17 AM
hi,
I am facing this same issue, i had configured 3 links between 6509 to vmware server. among the 3 ports only one port is in use and the remaining 2 ports are going to suspended state. if i remove the cable from cisco switch which is in use, suddenly from the remaining two ports which is in suspend state one port come as it is in use (P). kindly let me know how you had fixed this issue.
Regards,
Hariharan k
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