Discover Connections missing on Cisco ASR 9000 Series

Document ID : KB000008983
Last Modified Date : 14/02/2018
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Issue:

Spectrum "Discover Connections" feature doesn't find all of the connections between the devices. 

In detail there is a Cisco ASR 1006 which is connected with 3 ports to a Cisco ASR 9006 DEVLD1SLR01 and with 3 ports to a Cisco ASR 9006 DEVLD1SLR02. 

For the DEVLD1SLR01 all 3 connections will be discovered by Spectrum, for the DEVLD1SLR02 Spectrum detects only 2 of the 3 connections. 

The customer said that DEVLD1SLR01 and DEVLD1SLR02 are configured in the same way and that the discovery result should be same for both of them. 

Environment:
Spectrum 9.4.3 on Linux
Cause:

From the sapwalk of the two devices DEVLD1SLR02 and DEVLD1SLR01 found that the same IP address 10.0.0.2 was defined in the two devices.

Cisco investigated on it and confirmed following bug:

- we are facing issue only for particular ip address which is 10.0.0.2 

- Ip address 10.0.0.2 is assigned internally to some virtual interface and no ip address and no if-index assigned to these virtual interface. 

- When we do IP-MIB polling, for ip 10.0.0.2 router considering internal loopback interface and thus returning value 0. 

- Since IPMIB is not vhf aware, we can not do context based polling. 

- ThroughDDTS CSCuy73254 internal loopback has been made hidden for snmp and with fix of this, we can get normal physical interface if-index value for ip add 10.0.0.2. 

- Issue is present in 5.3.3 and should be fixed in 6.1.1 but we recommend to install 6.1.2 for which expected CCO target date is 31st Oct. 

 

Resolution:

 Issue presents in 5.3.3 and should be fixed in 6.1.1 but CISCO recommend to install 6.1.2 for which expected CCO target date is 31st Oct. 

Additional Information:

see https://quickview.cloudapps.cisco.com/quickview/bug/CSCuy73254