Show Link State when viewing links on the Enlinkd topology maps

The very basic requirement here is that the Link should be colored Red when either port associated with the Link is reporting "Down".  Down will be determined by the value of the MIB-2 SNMP object: ifOperStatus.  More advanced state setting capabilities should be considered, i.e. LinkStatusProvider in GraphML Topology, but this is the minimum requirement.  RFC provided below.   McCloghrie & Kastenholz Standards Track [Page 31] RFC 2863 The Interfaces Group MIB June 2000ifOperStatus OBJECT-TYPE SYNTAX INTEGER { up(1), – ready to pass packets down(2), testing(3), – in some test mode unknown(4), – status can not be determined – for some reason. dormant(5), notPresent(6), – some component is missing lowerLayerDown(7) – down due to state of – lower-layer interface(s) } MAX-ACCESS read-only STATUS current DESCRIPTION "The current operational state of the interface. The testing(3) state indicates that no operational packets can be passed. If ifAdminStatus is down(2) then ifOperStatus should be down(2). If ifAdminStatus is changed to up(1) then ifOperStatus should change to up(1) if the interface is ready to transmit and receive network traffic; it should change to dormant(5) if the interface is waiting for external actions (such as a serial line waiting for an incoming connection); it should remain in the down(2) state if and only if there is a fault that prevents it from going to the up(1) state; it should remain in the notPresent(6) state if the interface has missing (typically, hardware) components." ::= { ifEntry 8 }