LLDP-MED Location Identification for Emergency Services Emergency Services Workshop, NY Oct 5-6, 2006 Manfred Arndt

2 - Emergency Services Workshop, NY Oct ‘06 Scope  ANSI/TIA-1057 – LLDP Media Endpoint Discovery (LLDP- MED) – Extension to base IEEE 802.1AB (LLDP) standard to support multi-vendor interoperability between VoIP endpoint devices and IEEE 802 networking infrastructure elements, including physical location discovery (among other things) – Developed by TIA TR-41.4 (VoIP Standards) ANSI - American National Standards Institute LLDP - Link Layer Discovery Protocol TIA - Telecommunications Industry Association VoIP - Voice over IP

3 - Emergency Services Workshop, NY Oct ‘06 What is LLDP-MED? ANSI/TIA-1057, LLDP Media Endpoint Discovery:  Developed by TIA TR-41.4 (VoIP Standards)  Provides VoIP-specific extensions to base LLDP protocol – New TLVs (Type, Length, Value) for: Location identification, including to support Emergency Call Service LAN policy discovery (VLAN, Layer 2 priority, Layer 3 QoS) Fine grained power management for Power over Ethernet devices Inventory management – Endpoint move detection and reporting – “Fast Start” protocol behaviour, to improve timeliness – SNMP MIBs definition to support management of above

4 - Emergency Services Workshop, NY Oct ‘06  Enables Physical Location Services, including Emergency Call Service (ECS) – Supports NENA E911 and other location services (for example NENA TID )  Multiple Location Formats Supported, and easily extensible – Coordinate-based LCI (Location Configuration Information) subtype as defined by IETF RFC 3825 – Civic Address LCI subtype defined by draft-ietf-geopriv-dhcp-civil-09 (approved, in RFC Editor queue) – ELIN (Emergency Location Identification Number) subtype, to support traditional PSAP-based Emergency Call – One or more formats may be used simultaneously for different endpoint requirements  Two ECS methods supported (End-device & Notification based) – Switch advertises periodic location info for endpoint to use – Switch sends notification whenever a new endpoint is detected or an endpoint moves Location TLV NENA - National Emergency Number Association PSAP - Public Service Access Point

5 - Emergency Services Workshop, NY Oct ‘06 End-device based location Method 1 - Ideal for smart clients (e.g., SIP phones) 1. A management application or an LIS (Location Information Server) programs the location identification into network devices using SNMP and the LLDP-MED MIB – Every port may advertise a unique coordinate based, civic based, and/or ELIN location value 2. Network devices advertise periodic LLDP-MED frames containing the location identifier – Endpoint has location information to use immediately in the call setup

6 - Emergency Services Workshop, NY Oct ‘06 Notification based ECS (E-911) Method 2 - Infrastructure Based for smart management tools 1. IP phones advertises their MAC/IP, and telephone capability to network device via periodic LLDP-MED frames 2. Network device send an SNMP event notification to a management application or an LIS whenever a new IP phone has directly connected or disconnected 3. The management application or LIS will poll the IP phone information from network devices using the LLDP-MED MIB, to ensure integrity

7 - Emergency Services Workshop, NY Oct ‘06 Applicability to VoWLAN  IEEE networks are based on a shared media (per SSID) – A separate virtual link is created by AP for every station for unicast traffic – Stations share a single logical channel for broadcast/multicasts  LLDP applicability – LLDP operates above the MAC service layer, and as such can be easily implemented in any device with a MAC entity – LLDP is a multicast protocol, and as such is limited to advertise attributes common to all stations in the same SSID  Physical Location Identification – As currently defined, LLDP-MED can only provide physical location of AP – Opportunities for TLV or usage extensions to support WLAN client location discovery? AP - Access Point SSID - Service Set Identifier

8 - Emergency Services Workshop, NY Oct ‘06 VoWLAN Location Considerations  Emergency Services, Some Thoughts... – AP physical location may be suitable for many E-911 requirements – Wireless client would quickly discover new physical location on roaming – Ethernet switches need to be configured with physical location anyway, to support wired IP phones – AP could auto-discover it’s physical location via LLDP from wired network – For higher accuracy, AP could triangulate and advertise relative client location using specific frames or LLDP extensions (future work)

9 - Emergency Services Workshop, NY Oct ‘06 Summary  LLDP-MED provides several technical advantages for ECS location discovery – Existing, well defined standard that is easily understood – Simple and effective with high interoperability potential – High reliability due to few moving parts – Reduced complexity and low implementation cost, critical for cost-restrained devices – Easily extensible for future needs – Applicable to all IEEE LAN networks, may be extensible for VoWLAN  LLDP-MED is highly applicable to a very wide range of practical scenarios, particularly in managed enterprise networks  Believed that all interfaces required for ECS location delivery are defined by LLDP-MED today  Industry accepted solution, already deployed (notably IP phones)

10 - Emergency Services Workshop, NY Oct ‘06 References & Contacts The formal ANSI/TIA-1057 specification is freely available for download at: _final_for_publication.pdf Useful links: Contacts:  Peter Blatherwick editor of ANSI/TIA-1057  Manfred Arndt co-author of ANSI/TIA-1057 (LLDP-  Paul Congdon project director of IEEE 802.1AB-2005 (LLDP) and vice-chair of IEEE Working