The value of tmnxL2tpXtAvpCiscoNasPortAtm specifies what string to put in the Cisco-NAS-Port AVP, for L2TP control messages related to a PPPoA (PPP over ATM) session in this L2TP protocol instance. <origin> ::= 'c' | 'i' | 'm' | 'p' | 's' | 'v' 'c' - ATM VCI (Virtual Channel Identifier) 'i' - inner VLAN ID 'm' - ISA MDA number / ESA number 'p' - port number 's' - ISA slot number / ESA VAPP number 'v' - ATM VPI (Virtual Path Identifier) Maximum 32 bits can be specified. If less than 32 bits are specified, the least significant bits are used and the omitted higher bits are set to zero. Note that 'm' and 's' will contain ISA or ESA numbers, depending on the personality of the L2TP group. Example: *12v*12c*2s01 means 'the 12 least significant bits of the ATM VPI, followed by the 12 least significant bits of the inner ATM VCI, followed by the two least significant bits of the ISA slot number or the ESA VAPP number, followed by a zero and a one-bit', stored in network order in the least significant bits: 0000vvvvvvvvvvvvccccccccccccss01. An empty string specifies that the Extended NAS-Port AVP must not be transmitted.