Symptom
BGP model get-config and show-running are our of sync when 4-byte ASN and 2-byte ASN formats are used interchangeably.
The show-running will display one format, while the get-config returns the other format. If the configuration is deleted from the CLI, it may not be deleted from CDB.
Conditions
Case 1: If ASN is configured in 2-byte ASN format, but "bgp asnotation dot" is configured, the show-running and get-config will display different values.
For example -
CSR-uut#config t
Enter configuration commands, one per line. End with CNTL/Z.
CSR-uut(config)#no router bgp 100
CSR-uut(config)#router bgp 65538
CSR-uut(config-router)#bgp asnotation dot
CSR-uut(config-router)#end
CSR-uut#show run | sec bgp
router bgp 1.2
bgp asnotation dot
bgp log-neighbor-changes
CSR-uut#
The show-running returns "1.2", while the get-config will returned the parsed value of 65538.
Case 2: If the configuration is deleted from IOS CLI in a different format from what is stored in the model, the configuration does not get deleted from the model.
For example -
The customer configures via netconf - "router bgp 65538" and "bgp asnotation dot". Get-config will return the configured value of "65538", while the show-running will display the as-dot notation value "1.2".
Now, if the customer does "no router bgp 1.2" from the IOS CLI, bgp will be deleted from the device, but not the model. A get-config will still return "router bgp 65538".
Workaround
Customer should only use one format to configure.
To use 2-byte ASN format, remove "bgp asnotation dot" configuration and only configure with 2-byte ASN.
To use 4-byte ASN format, configure "bgp asnotation dot" and only configure with 4-byte ASN.
