Cisco CRS routers do not have PRE cards

Products

• VMware Smart Assurance
• Network Observability

Issue/Introduction

• What does PRE mean for redundancy cards in Cisco CRS routers?

• What is the logic for redundancycardgroup and redundantcard if both RouteProcessors are presented inside Cisco CRS routers?

Environment

All supported releases of Smarts and NCM

Resolution

• Cisco CRS routers do not have PRE cards, but redundancy cards can be created for these routers in Smarts IP using the following ASL script file:

<BASEDIR>/IP/smarts/rules/discovery/ic-cisco-rf.asl

• In ic-cisco-rf.asl the card description is specified as Redundant PRE as follows:

cardObj->Description = "Redundant PRE";

• Redundant cards are named as "PRE". You can modify ic-cisco-rf.asl to rename the card, but functionality is not affected. This is the same as for any other Cisco device. The data is fetched from Cisco-RF MIB, and if redundant card is present, then it is created under cardredundancy group, and Status and standbystatus are computed from the RF MIB.

 

Additional Information

Event computation:

CardRedundancyGroup  

event AllComponentsDown
"Indicates that all of the components in the redundancy group are down"
= if (NumberOfComponents > 0)
check (IsEveryComponentDown && !IsGroupPartOfSingleUnresponsiveSystem);

Card Down event computation

problem Down
"Indicates that a failed card is the root cause."
apriori(0.00001)
-> CardDownSymptom
if "InstrumentedBy" > 0,
CardImpact
explains;

symptom CardDownSymptom
= OperationallyDown,
NetworkAdapter_Realizes_DownOrFlappingSymptom 0.9,
NetworkAdapter_Realizes_PeerDownOrFlappingSymptom 0.9,
NetworkAdapter_Realizes_Peer_PeerDownOrFlappingSymptom 0.9,
UnitaryComputerSystem_PackagesSystems_Down 0.9,
Card_ComposedOf_Down 0.9;