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Download Training ATM Signaling. Overview What is Signaling Signaling Layers Signaling Protocol ATM Addressing ILMI Signaling Setup Practice

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  • Slide 1
  • Training ATM Signaling
  • Slide 2
  • Overview What is Signaling Signaling Layers Signaling Protocol ATM Addressing ILMI Signaling Setup Practice
  • Slide 3
  • Section What is Signaling ?
  • Slide 4
  • Mechanism by which users identify to whom they want to be connected Dynamic on-demand method for customers to communicate, the type of connection desired and the attributes of the connection Signaling is a Control Plane function that automates setting up a connection Predefined VCI = 5 Uses AAL5 Signaling, in conjunction with Call Processing in conjunction with Traffic Management and subscriber information, allocates the VPI/VCI to be used for the connection and communicates this back to the user
  • Slide 5
  • Switched Virtual Connections (SVC) Call Processing Why SVCs? Flexible connectivity More efficient resource utilization Automated Transparent to User Signaling channel predefined as VCI = 5 Messages (Q.2931 layer 3 protocol) exchanged from User to Switch Call Processing to request & setup connection
  • Slide 6
  • Section Signaling Layers What is Signaling
  • Slide 7
  • Assured Information Transfer AAL 1, 2 & 5 do not provide assured transfer (eg. re-transmission in the event of error) SSCOP (Service Specific Connection Oriented Protocol) uses sequence numbers and other controls to acknowledge or effect re-transmission of messages SSCOP can be placed above AAL 3/4 or 5 SSCOP is example of SSCS (Service Specific Convergence Sublayer) protocol Used with signaling for reliable connection establishment and support reliable communications about a connection
  • Slide 8
  • Switched Virtual Connections (SVC) User SVC Support Q.2931/UNI Sig Messages & Procedures Upper Layer Applications Physical Layer ATM (Cell) Layer ATM Adaptation Layer Q.2931 Data VPI/VCI = 0/5 SAAL SSCOP Q.2931 Data AAL5 SAAL: Signaling AAL SSCOP: Service Specific Connection Oriented Protocol
  • Slide 9
  • Section Signaling Protocol What is Signaling Signaling Layers
  • Slide 10
  • Simple Call Setup of a Connection Connect Ack Setup Call Proceeding Call Proceeding Connect Ack NNI UNI VPI/VCI assigning VPI/VCI assigning
  • Slide 11
  • Release of a Connection Release complete NNI UNI Release complete Release complete
  • Slide 12
  • Setup Message Elements Connection identifier Called party number Calling party number ATM user cell rate(s) QoS parameter(s) AAL parameters
  • Slide 13
  • UNI/Q.2931 Signaling Root (originator) Leaf A Leaf B Leaf C Unidirectional information flow Distributed tree topology using ATM switch multicast function Rapid connection setup supported Dynamic adding and clearing of endpoints Signaling messages in VCI = 5 Procedures similar to ISDN Q.931 but simplified Point-to-multipoint example
  • Slide 14
  • Section ATM Addressing What is Signaling Signaling Layers Signaling Protocol
  • Slide 15
  • UNI/Q.2931 Addressing ISO = International Standards Organization NSAP = Network Service Access Point Supports multiple addressing formats E.164 (Telephones) - 15 digits ISO NSAP (Internet) - 20 bytes - three formats possible Data Country Code (DCC) International Code Designator (ICD) Private E.164 Address
  • Slide 16
  • E.164 & NSAP SNNDCCC 15 Nibbles E.164 ID CC: Country Code NDC: National Destionation Code SN: Subscriber Number ESI: End System Identifier SEL: Selector F Example: 00049 2407 95860 F NSAP PrefixESISEL 12 Byte6 Byte1 Byte 47 0049240795860005320A4801 005066000028 00Example:
  • Slide 17
  • Section ILMI What is Signaling Signaling Layers Signaling Protocol ATM Addressing
  • Slide 18
  • ILMI Integrated Local Management Interface (ILMI) Based on SNMP Automatic retrieving and exchange of Interface information (UNI) between TE and a network device
  • Slide 19
  • ILMI Protocol Power on Cold start Clear tables ATM Address: ______.ESI Prefix.___ Get address No entry Set Prefix No error Prefix.ESI Set Address No error Prefix.ESI
  • Slide 20
  • Section Signaling Setup What is Signaling Signaling Layers Signaling Protocol ATM Addressing ILMI
  • Slide 21
  • ATM Vision Installation sysconf atm Show actual values of ATM settings: sysconf atm vp Set VP for signaling: sysconf atm ilmi enable Enable ILMI protocol: sysconf atm ilmi poll Enable ILMI polling:
  • Slide 22
  • ATM Vision and SVC sysconf atm p2mp enable Allow point-to-multipoint (p2mp) connections: sysconf atm signaling enable Enable signaling: sysconf atm uni = 3.0 | 3.1 | 4.0 Set user network interface (UNI) version:
  • Slide 23
  • ATM Vision and SVC Bandwidth and VPI/VCI restriction of Line- and Cascade Interface: root@Karlsruhe:/> sysconf port ? usage: sysconf port sysconf port show sysconf port line pcr |link sysconf port casc pcr |link|none sysconf port casc vpi any sysconf port casc vpi sysconf port casc vci any sysconf port casc vci sysconf port casc special enable|disable root@Karlsruhe:/> Note: If the Cascade Interface is configured to special disable, the VCI range 0..31 will be discarded
  • Slide 24
  • Setting up SVC video -s [Flags] Setting up a video SVC: atmaddr Getting Systems ATM End System Address (AESA):
  • Slide 25
  • Section Practice What is Signaling Signaling Layers Signaling Protocol ATM Addressing ILMI Signaling Setup
  • Slide 26
  • Hands on: SVC
  • Slide 27
  • Trouble shooting Get Signaling trace: ps aex | grep atmsigd kill -SIGUSR2 cat /tmp/atmsigd..trace. root@Karlsruhe:/> ps ax | grep atmsigd 140 ? S 0:26 atmsigd -b -l syslog -q ubr:pcr=128kbps root@Karlsruhe:/>