User's Manual

About E911 Services
The E911 service enables identification of the physical location of a registered user in the event
of an emergency call. The location is determined through the IP address and port level
discovery as per E911 administration. Session Manager interacts with E911 service upon user
registrations to obtain an Emergency Location Identification Number (ELIN). Each Session
Manager synchronizes with the E911 services server, stores ELIN records for its registered
users, and sends the ELIN to Communication Manager when an emergency call is made.
Session Manager synchronizes with the E911 services server when any of the following events
occurs:
• The server is added to Session Manager in order to initialize or synchronize databases
• The connection between Session Manager and the server is lost and later restored
• User registration and un-registration causes Session Manager to synchronize with the
E911 service.
E911 services operate in a primary and secondary server mode, in which one server is active
and the other is operating in a warm standby mode.
About NIC Bonding
NIC bonding enables two Ethernet interfaces on the Session Manager Security Module to act
as one, providing redundancy. The NIC bonding driver is configured to use "active-backup"
mode in which two Ethernet interfaces can be added as slaves to the NIC bonding driver
interface. Only one slave in the bond is active and the other slave becomes active if, and only
if, the active slave fails. The bond's MAC address is externally visible on only one port (network
adapter) to avoid any conflict with the switch. The NIC bonding interface needs only one IP
Address and uses the public IP address of the Session Manager Security Module. The NIC
bonding interface needs only one MAC address and uses the MAC address of the first slave
Ethernet interface. More than one of the NICs enable bonding so that traffic can traverse either
NIC connected to a separate L2 switch port based on the interface's link state.
The bonding driver supports two schemes for monitoring a slave interface's link state: the ARP
monitor and the MII monitor.
Note:
Following is the mapping of the physical Ethernet interfaces:
• Eth0: Management
• Eth1: Services
• Eth2: Security Module (SIP/PPM) - Physical port 3
• Eth3: Backup interface for NIC bonding - Physical port 4
Session Manager Administration
Administering Avaya Aura
®
Session Manager November 2010 333