I have a STP problem in a wiring closet in one of my building. The network as been upgraded last Saturday from 3500XL to 3750G. My network topology is :
Aggregation (L2) (4 3750G stacked)STP Root
15 wiring closet with 1 to 7 stacked 3750
In my wiring closet 7, my STP topology keep changing. The topology change originate from stackport1. How is this possible ?
Keep in mind that the config of the switch stack is the same in all the 15 wiring closet and this is the only place I have a problem. I can't change to RPVST, I still have 1 3500XL switch in my building. (to be changed over next weekend)
VLAN0150 is executing the ieee compatible Spanning Tree protocol
Bridge Identifier has priority 32768, sysid 150, address 0019.aa54.3280
Configured hello time 1, max age 8, forward delay 6
Current root has priority 150, address 0018.197f.e200
Root port is 616 (Port-channel1), cost of root path is 3
Topology change flag not set, detected flag not set
Number of topology changes 10 last change occurred 00:10:31 ago
That is just telling you that the device that caused it is somewhere down the stack . TCN's are not necessarily bad as long as they aren't constant . In a well configured network they should be minimal though . Look for things like user ports that do not have spanning tree portfast turned which will cause TCN's across the network everytime some user pc comes on line . Portfast stops tcn's from user ports . Do not use portfast on any network device attached interfaces .
Question We run asr9001 with XR 6.1.3, and we have a very long delay to
login w/ SSH 1 or 2 to the device compare to IOS device. After
investigation, the there is 1s delay between the client KEXDH_INIT and
the server (XR) KEXDH_REPLY. After debug ssh serv...
Introduction The purpose of this document is to demonstrate the Open
Shortest Path First (OSPF) behavior when the V-bit (Virtual-link bit) is
present in a non-backbone area. The V-bit is signaled in Type-1 LSA only
if the router is the endpoint of one or ...
Hi, I am seeing quite a few issues with patch install and wanted to
share my experience and workaround to this. Login to admin via CLI, then
access root with the “shell” command Issue “df –h” and you’ll probably
see the following directory full or nearly ...