VLT Configuration/Port Channel Issue

Question

Hi All, I'm wondering if you can help me. We have just purchased some Dell Force 10 S4048 and S3148 switches. I have got the S4048s configured in VLT. The switches see each other and have a Backup link connected which is also available. I have then connected a couple of S3148 switches to them using a VLT Port Channel. Everything is working and connectivity can be established, however, one of the interfaces to each S3148 is currently in a down state. They were both operational for a short while before going down. Below is the configuration for one of the S3148s, to save anyone getting confused.   S4048-1#show run int te1/24!interface TenGigabitEthernet 1/24description ** Link to S3148show -1 **no ip address!port-channel-protocol LACPport-channel 9 mode activeno shutdown!S4048-1#show run in po9!interface Port-channel 9description ** Link to S3148-1 **no ip addressportmode hybridswitchportvlan-stack trunkvlt-peer-lag port-channel 9no shutdown!S4048-1#show vlt detLocal LAG Id Peer LAG Id Local Status Peer Status Active VLANs------------ ----------- ------------ ----------- -------------9 9 UP DOWN 1, 100-101, 104-105, 301,305, 323, 2564 S4048-2#show run int te1/24!interface TenGigabitEthernet 1/24description ** Link to S3148-1 **no ip address!port-channel-protocol LACPport-channel 9 mode activeno shutdownS4048-2#show run int po9!interface Port-channel 9description ** Link to S3148-1 **no ip addressportmode hybridswitchportvlan-stack trunkvlt-peer-lag port-channel 9no shutdown!S4048-2#show vlt detLocal LAG Id Peer LAG Id Local Status Peer Status Active VLANs------------ ----------- ------------ ----------- -------------9 9 DOWN UP 1, 100-101, 104-105, 301,305, 323, 2564   3148-1#show run int Gi1/48!interface GigabitEthernet 1/48description ** Link to S4048-2 **no ip address!port-channel-protocol LACPport-channel 9 mode activeno shutdown3148-1#show run int Gi1/47!interface GigabitEthernet 1/47description ** Link to S4048-1 **no ip address!port-channel-protocol LACPport-channel 9 mode activeno shutdown!S3148-1#show run int po9!interface Port-channel 9description ** Link to S4048s **no ip addressportmode hybridswitchportvlan-stack trunkno shutdown If anyone could shed some light as to why the interfaces are doing this it would be appreciated. We are looking to use these in our primary data centre so need to get it working. Many Thanks, Talan

DELL-Josh Cr · Answer

Hi, If you do a no shutdown on those ports do they come back up? Does show logging show any errors for the ports?

TalanWestby · Answer

Hi,

After more troubleshooting and trying everything, I ended up swapping the SFPs over and back again and it just started working. I still don't understand why the switches needed this to bring the interface up but it's working, so despite the SFPs being the same ones that are not working they are now...

Thanks for your help.

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