Spectrum does not remove/delete connections between device models

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Article ID: 220414

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Updated On:

Products

CA Spectrum

Issue/Introduction


Even if you run a Discover Connections on the device, Spectrum does not automatically remove any existing connection between two interfaces if these interfaces are no longer connected with any other ports.

Environment

Release : 10.4.x - 21.2.1

Component : Spectrum Core / SpectroSERVER

Resolution

Spectrum will not remove a connection unless there is data to indicate a new connection should be created. We remove the connectivity only if the same port is resolved with a different port through AutoDiscovery otherwise the connection never be removed.

From the autodiscovery debug log the current existing link between UWVNLAMxxxxxx.ortus_Gi4/0/5 and UWVNLAMyyyyyy.ortus_Gi1/0/50 is not  removed because both interfaces are no longer connected with any other port.

On the contrary if an interface is connected to a new interface the existing link is deleted and the new connection created... eg.
....
Jul 16 21:30:59   Replace Network for Port UWVNLAMxxxxxx.ortus_Gi1/0/49(ifType=6) having potential connections :1
Jul 16 21:30:59     Port UWVNLAMxxxxxx.ortus_Gi1/0/49(ifType=6) <--> Port UWVNLAMyyyyyy.ortus_Gi1/0/52(ifType=6)

Jul 16 21:30:59   creating Layer-2 connections.
Connection was removed: Port UWVNLAMxxxxxx.ortus_Gi1/0/49(ifType=6) <--> Port UWVNLAMyyyyyy.ortus_Gi3/0/5(ifType=6)
Connection created ( ( Cisco CDP): Port UWVNLAMxxxxxx.ortus_Gi1/0/49(ifType=6) <--> Port UWVNLAMyyyyyy.ortus_Gi1/0/52(ifType=6)
 
NOTE: CA Spectrum discovery will not always remove old/stale connections unless the connection has been updated on an interface that had a previous connection.  For example, if you have a connection on Fa0 <->Fa0 and you change it to Fa1<->Fa1, Spectrum will create the new connection on Fa1<->Fa1 and will leave the old Fa0<->Fa0 connection there but If you updated the connection from Fa0<->Fa0 to Fa0<->Fa1, then Spectrum WILL destroy the connection Fa0<->Fa0 and create the Fa0<->Fa1 connection.  
 
 

Additional Information

see also articles  29206, 145942, 200910
https://knowledge.broadcom.com/external/article?articleId=29206
https://knowledge.broadcom.com/external/article?articleId=145942
https://knowledge.broadcom.com/external/article?articleId=200910