F. SNMP MIB Objects3160-A2-GB24-10 March 2001 F-13IP Group – “ipRouteAge” Object (ipRouteEntry 10)This object is implemented as a read-only object in the DSU/CSU. In theDSU/CSU, it reflects the value of the route’s time-to-live (in seconds). Whendisplays, a value of 999 represents a route that is retained permanently. Fortemporary routes, the ipRouteAge object decrements over time. All routes addedvia an SNMP set of the ipRouteTable are considered permanent routes. Theseroutes do not age, but will remain unless deleted via SNMP.ICMP Group, MIB IIThe ICMP Group objects are fully supported by the DSU/CSU.TCP Group, MIB IIThe TCP Group objects are fully supported by the DSU/CSU, with the exception ofthe tcpConnState object, which will be read-only.UDP Group, MIB IIThe User Datagram Protocol (UDP) Group objects are fully supported by theDSU/CSU.Transmission Group, MIB IIObjects in the transmission group are supported on the network and DTEDrop/Insert (DSX-1) interfaces, the COM port, the MODEM port, the AUX port,and the synchronous data ports. The objects in the transmission group are notdefined within MIB II, but rather through other Internet standard MIB definitions.The following two transmission group objects are supported by the DSU/CSU. ds1 (transmission 18) – The transmission object supported on the T1interfaces. rs232 (transmission 33) – The transmission object supported on thesynchronous data ports, COM port, AUX port, and MODEM port.The “ds1” transmission object is defined by the DS1/E1 MIB. The rs232transmission object is defined by the RS-232-like MIB.
