06-21-2013 12:48 AM - edited 03-07-2019 02:00 PM
Hi all
The switches are stacked together
Can anyone tell me what the recommended setup should be betweeen a cisco switch and a HP virtual connect blade chassis c7000
On the back of the blade chassis there are 2 HP switches, basically we have 1 etherchannel to 1 switch and 1 etherchannel to the other switch on the chassis.
We were getting mac flaps appearing so someone has put in static macs and applied them to each of the port channels, is this correct?
I need to know this info as we are having major issues with these servers, I have done a pcket capture from the back and all I see is retransmissions / Duplicate acks and tcp out of order packets
Can someone let me know asap
cheers
Carl
06-21-2013 01:25 AM
Hello,
Sounds like you have a loop! - Are the two cisco switches interconnected with each other. I assume the hps will be as their in a chassis.
Is stp enabled on all switches?
can you post the ethechannel config?
res
Paul
Please don't forget to rate any posts that have been helpful.
Thanks.
06-21-2013 03:12 AM
etherchannel config
interface Port-channel30
description HP Blade Ethcnl-3
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 505,691-693,4000
switchport mode trunk
switchport nonegotiate
this goes to switch 1 on the blade chassis
interface Port-channel40
description HP Blade Ethcnl-4
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 505,691-693,4000
switchport mode trunk
switchport nonegotiate
this goes to switch 2 on the blade chassis
we also have static mac addresses configured on the switch
mac address-table static 0017.a477.040c vlan 691 interface Port-channel30hannel40
these were put on to stop the mac flaps
any ideas ?
cheers
Carl
04-26-2021 12:37 PM
What was the solution to this Carl? We have a similar situation or maybe the exact same one.
05-04-2021 05:58 PM
My experience with HP switches is getting a bit dated, but the HP switch used MST (single spanning tree across all VLAN's) when I last used them. Cisco switches default to PVST (unique spanning tree instance for each VLAN). This caused some really strange and intermittent spanning tree behavior. I can't find an old config where I did that (it was over a decade ago), but I think that would be what is referred to as a "boundary port". https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3560/software/release/12-2_52_se/configuration/guide/3560scg/swmstp.html#wp1143659
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