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STP Topology Changes causing performance issues - MAC entries being inmediately removed

 
Joe-Joe
Occasional Visitor

‎09-02-2019 05:46 AM

‎09-02-2019 05:46 AM

STP Topology Changes causing performance issues - MAC entries being inmediately removed

Hi! We are troubleshooting a LAN with more than 70 HP Comware 5 (and 7) switches  with frequent topology changes causing performance issues. 
Hypothesis is: 1) Topology Change happen.  2) Every TC cause some or lots of MAC entries being removed from MAC tables. 3) Traffic directed to deleted MAC addresses is flooded to all interfaces (unicast-unkown) and causing general flooding and issues. 

Other vendors say that TCs cause aging time of MAC entries to be set to 15 seconds. I don´t find that information in HP documentation, but what we observe is that there are MAC entries being deleted in less than 2 seconds, which we do not understand. And it´s not helping. 


%Sep 2 12:51:31:357 2019 HP_SWITCH STP/6/STP_NOTIFIED_TC: Instance 0's port Bridge-Aggregation2 was notified of a topology change.
%Sep 2 12:51:33:161 2019 HP_SWITCH MAC/6/MAC_INFORMATION: -Chassis=1-Slot=6; -Action=Deleted-MacAddr=xxxx-xx9d-3d44-VlanID=104-MACType=1-IfName=GigabitEthernet1/6/0/10; MAC address table changed.
%Sep 2 12:51:34:182 2019 HP_SWITCH MAC/6/MAC_INFORMATION: -Chassis=1-Slot=5; -Action=Deleted-MacAddr=xxxx-xxdd-2e29-VlanID=250-MACType=1-IfName=Ten-GigabitEthernet1/5/0/2; MAC address table changed.
%Sep 2 12:51:36:800 2019 HP_SWITCH MAC/6/MAC_INFORMATION: -Chassis=2-Slot=3; -Action=Deleted-MacAddr=xxxx-xxea-1731-VlanID=250-MACType=1-IfName=GigabitEthernet2/3/0/7; MAC address table changed.
%Sep 2 12:51:37:181 2019 HP_SWITCH MAC/6/MAC_INFORMATION: -Chassis=1-Slot=6; -Action=Deleted-MacAddr=xxxx-xxe9-2be8-VlanID=1-MACType=1-IfName=GigabitEthernet1/6/0/9; MAC address table changed.
%Sep 2 12:51:38:776 2019 HP_SWITCH MAC/6/MAC_INFORMATION: -Chassis=1-Slot=6; -Action=Added-MacAddr=xxxx-xx9d-3d44-VlanID=104-MACType=1-IfName=GigabitEthernet1/6/0/10; MAC address table changed.
%Sep 2 12:51:45:346 2019 HP_SWITCH MAC/6/MAC_INFORMATION: -Chassis=1-Slot=5; -Action=Added-MacAddr=xxxx-xxdd-2e29-VlanID=250-MACType=1-IfName=Ten-GigabitEthernet1/5/0/2; MAC address table changed.
%Sep 2 12:51:48:053 2019 HP_SWITCH MAC/6/MAC_INFORMATION: -Chassis=2-Slot=3; -Action=Added-MacAddr=xxxx-xxea-1731-VlanID=250-MACType=1-IfName=GigabitEthernet2/3/0/7; MAC address table changed.
%Sep 2 12:52:27:911 2019 HP_SWITCH MAC/6/MAC_INFORMATION: -Chassis=1-Slot=6; -Action=Added-MacAddr=xxxx-xxe9-2be8-VlanID=1-MACType=1-IfName=GigabitEthernet1/6/0/9; MAC address table changed.

 

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%Sep 2 14:33:31:749 2019 HP_SWITCH STP/6/STP_NOTIFIED_TC: Instance 0's port Bridge-Aggregation4 was notified of a topology change.
%Sep 2 14:33:32:408 2019 HP_SWITCH MAC/6/MAC_INFORMATION: -Chassis=2-Slot=3; -Action=Deleted-MacAddr=xxxx-xxea-1731-VlanID=250-MACType=1-IfName=GigabitEthernet2/3/0/7; MAC address table changed.
%Sep 2 14:33:32:631 2019 HP_SWITCH STP/6/STP_NOTIFIED_TC: Instance 0's port Bridge-Aggregation4 was notified of a topology change.
%Sep 2 14:33:32:946 2019 HP_SWITCH MAC/6/MAC_INFORMATION: -Chassis=1-Slot=4; -Action=Deleted-MacAddr=xxxx-5686-0010-VlanID=23-MACType=1-IfName=GigabitEthernet1/4/0/45; MAC address table changed.
%Sep 2 14:33:33:108 2019 HP_SWITCH MAC/6/MAC_INFORMATION: -Chassis=1-Slot=5; -Action=Deleted-MacAddr=xxxx-xxdd-2e29-VlanID=250-MACType=1-IfName=Ten-GigabitEthernet1/5/0/2; MAC address table changed.
%Sep 2 14:33:33:243 2019 HP_SWITCH MAC/6/MAC_INFORMATION: -Chassis=1-Slot=3; -Action=Deleted-MacAddr=xxxx-5686-6930-VlanID=105-MACType=1-IfName=GigabitEthernet1/3/0/15; MAC address table changed.
%Sep 2 14:33:33:244 2019 HP_SWITCH MAC/6/MAC_INFORMATION: -Chassis=1-Slot=3; -Action=Deleted-MacAddr=xxxx-5686-5a71-VlanID=105-MACType=1-IfName=GigabitEthernet1/3/0/15; MAC address table changed.
%Sep 2 14:33:34:270 2019 HP_SWITCH MAC/6/MAC_INFORMATION: -Chassis=1-Slot=4; -Action=Deleted-MacAddr=xxxx-5686-3b85-VlanID=105-MACType=1-IfName=GigabitEthernet1/4/0/45; MAC address table changed.
%Sep 2 14:33:35:139 2019 HP_SWITCH MAC/6/MAC_INFORMATION: -Chassis=1-Slot=4; -Action=Deleted-MacAddr=xxxx-5686-59db-VlanID=105-MACType=1-IfName=GigabitEthernet1/4/0/45; MAC address table changed.
%Sep 2 14:33:35:229 2019 HP_SWITCH MAC/6/MAC_INFORMATION: -Chassis=1-Slot=6; -Action=Deleted-MacAddr=xxxx-xxe9-2be8-VlanID=1-MACType=1-IfName=GigabitEthernet1/6/0/9; MAC address table changed.
%Sep 2 14:33:36:718 2019 HP_SWITCH MAC/6/MAC_INFORMATION: -Chassis=1-Slot=4; -Action=Deleted-MacAddr=xxxx-5686-0321-VlanID=105-MACType=1-IfName=GigabitEthernet1/4/0/45; MAC address table changed.
%Sep 2 14:33:36:862 2019 HP_SWITCH MAC/6/MAC_INFORMATION: -Chassis=1-Slot=6; -Action=Deleted-MacAddr=xxxx-xx9d-3d44-VlanID=104-MACType=1-IfName=GigabitEthernet1/6/0/10; MAC address table changed.

 

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We do not understand why MAC entries removal is so quick. We do not understand why not all MAC entries are removed a the same time. Instead, they disappear "randomly", some of them in less than 1 second and others after a good amount of seconds. 

Any idea? Any documentation?

 

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srini_c
Occasional Advisor

‎09-15-2019 05:05 AM

‎09-15-2019 05:05 AM

Re: STP Topology Changes causing performance issues - MAC entries being inmediately removed

Hi  Joe,

Did you configure edge port feature on all  non-uplink ports.

Also paste the STP related configuration here from the device.

Regards

 

 

 

I am a HPE Employee
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