The S Media Server assumes control of port networks one, three, four, and five. Once the. S ESS server assumes control of the port network, it attempts to take over all o the r port. In the second takeover example Figure 19 , the customer experiences a network failure. Communication between the main server and port networks one through three has not been.
The IPSIs in port network four and port network five can no longer. When the no service timer. Once the ESS server controls a port. The S ESS server cannot. Port network two does. Port network five does not have an IPSI and connects using an. The S ESS server assumes control of port network four. Once in control on port network four, the ESS server assumes control of port network five. The users in port networks one through three can make station-to-station calls to each o the r but.
The reverse is. Two ESS servers are administered. The S ESS server has the highest priority and is the. The goal of this configuration is to have all port networks and gateways under the control of one. The no service timer is administrable and. The timers monitor the period of time that the server or gateway spends in a specific.
Link Recovery processes. Because of a catastrophic main server failure, port networks one through eight can no longer. After the no service time out. The no service timer expires and the IPSIs in port networks one through. Some functionality provided by adjuncts may be missing for users registered with the LSP. Users registered with the LSP may not be able to make normal station-to-station calls to.
The problem that caused the main server outage has been fixed Figure All port networks. Using the Auto Return functionality, the. Auto Primary feature is not being used Figure 25 , a manual reset must be performed on the. During the design and planning phase of an ESS implementation, it is important to understand. This is done by determining the. Goals for deploying and. Avoiding fragmentation of the system: The ESS server controls as much of the system as.
Avoiding overload of network resources with excessive call traffic: Each ESS server. Multiple ESS servers may be needed to support. In this way, an ESS server can potentially assume control of a. During the initial design and whenever additional capacity is added, the priorities listed above. Once a plan is developed to allow an ESS server to take control.
After an overall strategy is selected, determine the placement of the ESS servers in the. Determine the administered values and communities for each ESS server. For fur the r. The following list contains terms that are used in an ESS environment. You need to become. Main server and ESS server: This book refers to the primary controller as the main server.
A cluster. If the cluster is a pair of duplex. A CLID uniquely identifies a. The value. That means each server in a duplex pair has a different SVID. You can number the. The SVOR. The A-side server in a duplex pair always has ordinal. The SVOR is set automatically when. Detailed planning for ESS is mandatory. Certain information must be ga the red to facilitate the. For more information on configuring and administering the main server and the ESS. The SVID must be in the range of one to Each server in a server pair.
The administrator can assign the SVID sequentially or allow gaps in the. License files: The main server and each ESS server requires its own license file.
For more information on ESS. Starting with Communication Manager Release 3. This connectivity can be used in addition to the current connectivity available using. The introduction of this functionality does not change the use or the functionality of the. During the configuration of a server, the PE interface is assigned to an interface such as a. The interface that is selected determines which physical. Communication Manager establishes a logical connection.
The PE interface is enabled by default in the license file. The PE administration is performed on the main server. The ESS server receives the. On an LSP, the H. Therefore the H. The following tables show the PE functionality that can be used on specific servers in certain.
For more information on how to administer the PE interface, see The survivable-processor. The ESS server uses. This CLAN should be local to the. During the initial registration to the main. CLAN boards in the configuration. If the ESS server cannot communicate with the configured. Only the active server of an S series media server pair registers with.
Translations are received from the main server: The ESS server performs a reset after. During the reset the ESS server stops sending. The ESS server. If an ESS server is still registered with the main server while controlling port. In this case, the ESS server accepts the translation download but does. The main server shows the status of the ESS server as unregistered in the status. Keep-Alive messages from the ESS server to the main server stops.
The main server. It the attempts fail, the ESS. The main server shows the ESS server as unregistered in the. Use the information in Table 4 to determine which ports. For the most part, capabilities of the main server and the ESS server will be the same if both are. There are some important differences between the main server and.
The license file for an ESS server must. Translations: You can change translations on an ESS server but you cannot save the m. A file sync from the main. Administrative value: The value of the main server is always the highest ranking value on. The value for the main server cannot be administered. However, the. For information on administration, see. Media Server can support a duplicated network with the addition of a dual NIC card.
On the simplex main server the PE interface can be. Use this section to understand trunking considerations in an ESS environment. The backup D channel is located on channel 24 of a second DS1 interface. While both DS1 interfaces are connected to the same Central Office, only one is used for.
In the event of a failover, if a different ESS server controls the primary and the backup D. The Service Provider will only use one of. When the D channel is not in service, the associated B channels of. If it is not possible to place both D-channels in one port network, place the D-channels. After failover, if the D-channels are being serviced by two different ESS servers:.
On the SAT of the server, use the busyout port X. Synchronization is not supported. If a DS1 looses the primary and. In the event that the H. An E call or o the r emergency call handling can only be routed if the trunk facility is under. IGAR preserves the. After failover, if an ESS server controls port networks or media gateways in one or more. For example, an ESS customer with eight port networks, administers each port network in a.
IGAR is administered between all eight regions. ESS server one uses. IGAR to establish inter-port network bearer between port networks one through four. Each Local. Only ESS server controls one port network five through eight. IGAR does not apply for the. All port networks within a CSS must be in network region one.
When an ESS server obtains. During a failover, PCOL calls. Alternate routes may be used if under the. When a customer is. S series servers and a reference IPSI. There can be a single call control connection called. Using CNC allows customers, with local private control. In the event of a main server failure, the CSS is out-of-service. This is true because the. CSS is enabled only for the main server and disabled for all o the r servers. The number and vintage of the IP Media Processor resource will have an impact on the.
Traffic engineering should consider the use. An ESS server receives its values when it is administered on the main server using the. Each IPSI maintains its own priority list of eight clusters servers in order of highest priority.
A maximum of 63 ESS clusters can be. An ESS cluster can be a simplex or a duplex pair of. If the advertised value of the ESS cluster:. The rejected ESS cluster continues to advertise to. Note: The status ess port-networks command is used to display the status of all the port. Since the main server defaults to the highest priority in a. The value for the main. In the system-parameters ess form, each ESS server is administered with one of two. Local Preferred , along with a community Comm field and a priority value Pri Scr field ,.
The System Preferred preference has the highest administered value, followed by the Local. Preferred preference, and the n an ESS server with no preference setting.
The value for the. Local Only works differently than preferences. While the System Preferred preference, the. If the re are multiple Local Only servers within one community, ei the r the priority. Important: It is important to note that the administration of Local Only, does not affect an. See Table 5 for a list of ESS servers relative priorities in order from highest to lowest value.
After the System Preferred preference, the Local Preferred. Every time it disconnects and reconnects to the main server. An ESS server disconnects. When the ESS server resets, communication. The IPSI adjusts its priority list, removing the. ESS server from the list. When the ESS server re-establishes communication with the. In this case the ESS cluster with the lowest value is removed from the list and the.
In a special case where the lowest priority cluster is controlling an IPSI port. The ESS cluster performs a reset to bring in the new translations. For details on the fields in the ess port-networks screen, see. The following examples demonstrate how the IPSI priority list is used during failover scenarios.
During the planning phase, the administrator decided that:. The primary goal was to keep as much of the system in-tact as possible. In order to. Both ESS servers backup the main server if the main server fails, or. If the WAN fails where port networks two, four, five, and six, can no longer communicate. To administer ESS , it is helpful to start with a data collection worksheet, as shown in Table The System Preferred preference has the highest value of any preference.
Fur the r ranking within the System Preferred preference is achieved by adding a priority. The IPSI priority list in any community will. ESS server three is administered as Local Preferred for community two. The Local. Preferred preference is the second highest preference after System Preferred for port.
For port networks outside its community, the Local. Preferred preference holds no value and would be the same as an ESS server with no. In this example, ESS server three would be the third choice for port network three, port. ESS server three would. A Local Only. That means,. All port networks failover to ESS. In this example, the multi-connect configuration has seven port networks and three ESS. As in the previous IP connected configuration example, the administrator wants the.
Should IPSI communication to the. Port networks six and seven connect to the main server over the ATM network. In this example all IPSIs have the same priority lists.
In order for an ESS server to control. ESS server on the ir priority lists. ESS 2 is not available to. PN5 request service from ESS 2. ESS 1 will be the first to. Depending on your configuration, the re are a number of timers that are used during a failover.
After failover, conflict with the timers may produce a configuration that you did not want or. ESS server on its priority list. All stable calls remain in a stable condition when the no service. The time from when the no service timer actives, to the time the IPSI requests. If the communication to the. The value for the no service timer is administrable from three to 15 minutes, with a default of.
For more information on the no service timer, see System-parameters ess form -. This section provides a high-level overview of Link Recovery. For more detailed information,. The H. Call control user actions such as Hold, Conference, or Transfer while the call is in.
If the link goes down, Link Recovery preserves any existing calls and attempts to re-establish. If the gateway cannot reconnect to the original server, the n Link Recovery. Link Recovery design incorporates three separate timers that monitor the period of time that the. Table 10 lists the timer. If the gateway cannot reconnect with the original server, the n it searches the. MGC list in order for alternate resources that are above the Transition Point if.
If the Primary Search Timer expires before the gateway can re-establish the link. The gateway makes only one connection attempt with any. If the gateway cannot re-establish the link to any of the resources below the. Transition Point, the n it starts over at the top of the MGC list and continues to the. If the gateway still cannot connect to any alternate resources and Total Search.
While the H. Once the link is re-established, normal call processing. If the gateway successfully reconnects, the actual outage is less than two seconds.
Should the link failure persist for a few minutes, some features or capabilities are affected:. Calls held in queue for an ACD group, attendant group, call park, or calls on hold might be. The talk path between two or more points remains up, even if one or all of the parties. If the link failure continues for several minutes, expect inaccuracies in Basic Call.
If the endpoint cannot reconnect to the original Gateway, the n H. Attempts to overcome any network or hardware failure by re-registering the IP Endpoint. Continues trying to reconnect if the call ends and the IP Endpoint has not yet reconnected. Since the re is no communication possible between the Gateway and the IP endpoint during a.
In essence, the server cannot react to any stimuli until the. Note: Features may act differently depending on the release of Communication. Depending on the reason for the failure, some Communication Manager features may not work. If the failure is on the main server but the network is still intact, you may not.
This section highlights how a failover would affect the following Communication Manager. Announcements are available to callers when the announcement is under the control of the. When a port network fails-over to an ESS server any attendant console in that port network will.
Calls can be taken from the attendant console. Only the trunks under the control of the servicing. ESS server will be affected by the deactivation of the Night Service mode. BSR polling works if the facility used for routing the polling call is under the control of that ESS. Call Classification will work only if the re are one or more Call Classification resources under the. Calls may follow a call coverage path only if the route is under the control of the same ESS.
If the covered party is not under the control of the ESS server, the covering call will go. Routing a call using Call Vectoring is successful only if the route-to-endpoints are under the. This is true whe the r the endpoint is ano the r station, adjunct, or route. Calls are routed.
Crisis alerting calls can only be routed to endpoints under the control of the ESS server that. Are you ready? Avaya Media Gateways Avaya supports two styles of media gateways. Call processing, vectors, call center, routing, and device management all live there What happens if the main brain dies? How does an H. Making it real Unfortunately, there is no centralized way to configure this.
The commands to create an MGC list similar to my example will look something like this: clear mgc list set mgc list Until the next time…. Like this: Like Loading Leave a Reply Cancel reply Enter your comment here Fill in your details below or click an icon to log in:. Email required Address never made public. Name required. Follow Blog via Email Enter your email address to follow this blog and receive notifications of new posts by email.
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The Tek-Tips staff will check this out and take appropriate action. Click Here to join Tek-Tips and talk with other members! Already a Member? Join your peers on the Internet's largest technical computer professional community. IP phones Avaya Inc. What is ESS? Enterprise Survivable Servers allow backup servers to be placed at various places in a network so that communications can continue in the event that the main server s fails, or when connectivity to the main server s is lost Enterprise Survivable Servers can be deployed where needed throughout your network to provide increased communications continuity Enterprise Survivable Servers provides service to IPSI cards which automatically request service from an ESS server s if the control signal to the main server is lost.
All ESSs have full translations All ESSs connect to all IPSIs advertising their factors The IPSIs dynamically create preference lists of backup clusters based on those supplied factors that it can communicate with The IPSIs will request service from an ESS or the main cluster based on the highest ranked cluster it can communicate with when port network is not being controlled The preference list is dynamically changing based on connectivity changes.
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