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04-27-2017 08:03 AM
04-27-2017 08:03 AM
1920 trunk to 1810 and 1820
Hello!
Does anyone have experience with this scenario? With this configuration, there is an intermittent network dropout throughout the day.
Any help would be very much appreciated. Thank you.
Regards,
Kevin
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04-27-2017 12:44 PM
04-27-2017 12:44 PM
Re: 1920 trunk to 1810 and 1820
Can you detail the "intermittent network dropout throughout the day"? what happens?
What 1920's Log (and BAGGs status) reports exactly?
Are you using LACP or Non-Protocol aggregations methods on BAGG1 and BAGG2 against 1810 and 1820?
Are the uplinks stable?
How your clients/servers are distributed on that network topology? how many of them you have?
I'm not an HPE Employee
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04-27-2017 09:05 PM
04-27-2017 09:05 PM
Re: 1920 trunk to 1810 and 1820
Hello,
Can you detail the "intermittent network dropout throughout the day"? what happens?
1. I tested copying large files between VLANs, it didn't even start, just hung there, I was also running ping -t from a machine connected to HP 1820-24G to a server connected to HP 1810-24G and it timed out. I also ran another ping -t to the HP 1810-24G, also timed out. When I stop the file transfer, all pings goes back to normal.
2. Connection from clients to server are intermittent, our desktop applications that points to our servers disconnects intermittently.
What 1920's Log (and BAGGs status) reports exactly?
The logs from time to time will show stp network topology change, they come in group, say like 5-6 of them in one time, unfortunately I do not have the exact log message anymore as the logs were cleared.
Are you using LACP or Non-Protocol aggregations methods on BAGG1 and BAGG2 against 1810 and 1820?
Yes.
Are the uplinks stable?
Yes.
How your clients/servers are distributed on that network topology? how many of them you have?
Clients are residing in VLAN 2, 3, 5 while servers are all in VLAN 1.
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05-03-2017 06:30 PM
05-03-2017 06:30 PM
Re: 1920 trunk to 1810 and 1820
Reduce the STP priority on the middle switch.
Check switchport stats and switch logs. and study both carefully.
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05-08-2017 06:44 AM
05-08-2017 06:44 AM
Re: 1920 trunk to 1810 and 1820
Vince, afaik the 1810 hasn't got spanning tree
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05-08-2017 06:32 PM
05-08-2017 06:32 PM
Re: 1920 trunk to 1810 and 1820
You're right.
So on the 1920 you should block BPDUs out BAGG2, and on the 1810 you should disable loop protection on Trunk1.
And the 1920 should have its STP priority lowered.
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05-17-2017 09:16 AM
05-17-2017 09:16 AM
Re: 1920 trunk to 1810 and 1820
Further digging from memory: Was the 1810 the switch which couldn't handle VLANs properly?
The extra tag costs 4 extra bytes, so you had to lower MTU on NICs to 1496 to make packets fit