May 24, Avaya Labs, Westminster CO. ABSTRACT

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1 Application Note Avaya MultiVantage Software on an Avaya S8700 Media Server and an Avaya G600 Media Gateway (S8700/G600) Network Requirements and Configuration Guidelines Issue 1.1 COMPAS ID: May 24, 2002 Converged Solution Support Team Avaya Labs, Westminster CO. ABSTRACT This document outlines the IP network requirements unique to the Avaya MultiVantage Software on an Avaya S8700 Media Server and an Avaya G600 Media Gateway (S8700/G600). It is expected that as a Voice over IP (VoIP) product, S8700/G600 will operate in an environment as specified in Avaya IP Voice Quality Network Requirements, [1]. This document will enable systems engineers, Network Administrators, Sales teams and prospective customers to assess the suitability of the customer s network for a S8700/G600 installation. Design for voice quality, traffic engineering and design for QoS are not covered in the document. DJ 2002 Avaya Inc. All rights reserved. (S8700/G600) Network Requirements 1

2 1. Introduction References Acronyms Conventions Scope Which is the Right Requirement General Requirements General VoIP Requirements S8700/G600 specific requirements End-to-End Delay (including Jitter, Loss, and Misorder effects) for the IPSI-link Network Convergence Time: Detailed Recommendations and Guidelines for the S8700/G Media Server and G600s co-located, LAN (Layer 2) requirements Media Server and Media Gateway interfaces VLAN and QoS Routed Environments Routers and Layer 3 switches Network Topology Routing Protocols DSCP, TOS and QoS Remoted G600, WAN requirements Estimating BW required by a S8700/G600 Installation IPSI-link Traffic Level Voice (Bearer) Traffic Signaling Applications required and recommended Quality of Service (QoS) Policies Conclusion DJ 2002 Avaya Inc. All rights reserved. (S8700/G600) Network Requirements

3 1. Introduction This document outlines the IP network requirements unique to Avaya MultiVantage Software on an Avaya S8700 Media Server and an Avaya G600 Media Gateway (S8700/G600). It is expected that as a Voice over IP (VoIP) product, S8700/G600 will operate in an environment as specified in Avaya IP Voice Quality Network Requirements. [1] This document will enable systems engineers, Network Administrators, Sales teams and prospective customers to assess the suitability of the customer s network for a S8700/G600 offer. The control link between the Avaya S8700 Media Server and the Avaya G600 Media Gateway is transported over the customer s network. Care in design must be taken to assure performance. A range of performance levels can be achieved with this offer. The conventions below will aid in designing to the appropriate level. 1.1 References [ 1 ] Avaya IP Voice Quality Network Requirements Issue 1.4 (or later ) - white_papers [ 2 ] Estimating Voice over IP Bandwidth on WAN connections. (Will be posted on same white paper URL as above, once it is Published)Installing the Avaya S8700 Media Server for IP Connect Configurations [ 4 ] QoS design Guidelines in Administration for Network Connectivity for Avaya MultiVantage Software [ 5 ] Avaya IP Telephony Implementation Guide App Note to be published. [ 6 ] Pre-Installation Information--S8700 IP Connect [ 7 ] Pre-Installation Network Worksheet S8700 IP Connect Acronyms CoS Class of Service CLAN Control LAN board TN799 CRTP Compressed RTP DHCP Dynamic Host Configuration Protocol DNS Domain Name Service FTP File Transfer protocol G600 G600 Media Gateway IP Internet Protocol IPSI IP Server Interface TN2312 IPSI-link TCP/IP link from the S8700 Media Server to the IPSI k-bhc Thousand busy hour calls, a measure of call set-up rate. LAN Local Area Network Media Processor IP Media Processor Board, TN2302 RTP Real Time Protocol QoS Quality of Service DJ 2002 Avaya Inc. All rights reserved. (S8700/G600) Network Requirements 3

4 SAT System Access Terminal S8700 Avaya S8700 Media Processor S8700/G600 Avaya MultiVantage Software on an Avaya S8700 Media Server and an Avaya G600 Media Gateway TFTP Trivial File Transfer Protocol VoIP Voice over IP WAN Wide Area Network 1.3 Conventions Understanding the meaning of these keywords is critical to a successful implementation. Required: These are the MINIMUM requirements that must be met for S8700/G600 to function. Meeting these requirements DOES NOT assure that service and voice quality will meet customer expectations. Not meeting these requirements will often yield poor performance in some aspect of the product. Typical: This gives guidance for a typical (successful) design. Typical configurations may or may not be appropriate depending on the design of the customer s network. Recommended: The configuration or requirements we recommend for robust operation. While systems can be made to work without meeting these recommendations, numerous pitfalls can be avoided by following these recommendations. Note: Useful information, tip, and pitfalls to avoid. 1.4 Scope Avaya MultiVantage Software on an Avaya S8700 Media Server and an Avaya G600 Media Gateway (S8700/G600) is a VoIP switching product from Avaya, part of the ECLIPS family of offers. The AVAYA IP Voice Quality Network Requirements are generally applicable to S8700/G600 as VoIP product. This document will address specific requirements that are unique to S8700/G600. The S8700/G600 transports call-control (the IPSI-link) over the customer s network and requires the network, the IPSI, and the Server to inter-work. General VoIP issues (e.g. QoS) may be touched on in this document if it is expedient to deal with them for the S8700/G600 program. General VoIP or QoS requirements will be migrated to more general documents as those documents are updated. 1.5 Which is the Right Requirement Avaya s products, the data environment and implementation strategies are continually evolving. This document represents the best understanding of these issues at the time it was written. Please consult newer documents; particularly for general VoIP requirements to be sure you have the latest information. 4DJ 2002 Avaya Inc. All rights reserved. (S8700/G600) Network Requirements

5 2. General Requirements S8700/G600 must operate in production data environments. There are critical differences between a conventional telephony environment and a traditional data environment. In a conventional telephony environment, the call control (signaling to end-points), bearer (voice), and the intra-switch control are transported over circuits that are engineered for telephony and are not shared with other services. The critical characteristics of these circuits, i.e. errors and latency, are relatively good and vary little over time. In a data environment the characteristics of the signaling, intra-switch control and the bearer network vary from installation to installation and over time. These characteristics are influenced by events and traffic unrelated to the telephony application. It is important to control these characteristics for telephony applications over a traditional data network to achieve acceptable performance. 2.1 General VoIP Requirements The VoIP requirements for S8700/G600 are the same as the requirements for all ECLIPS offers. It is expected that [ 1 ] - white_papers will reflect these VoIP requirements; please refer to the most recent version. 2.2 S8700/G600 specific requirements The link between the IPSI and the Server (IPSI-link) is a TCP that carries all control signals for the G600 port network. The G600s may be local (on the same LAN as the Server) or remoted across a WAN link. When communication is lost on this link, no calls can be made in the associated G End-to-End Delay (including Jitter, Loss, and Misorder effects) for the IPSI-link Delay is measured from network edge to network edge. Network edge is the ingress point or egress point for the customer s network, typically an access ethernet switch. Recommended: Delay<=100ms Required: Delay<=300ms Rationale: The IPSI-link is a TCP link. TCP will reassemble the data stream before passing the information to the applications (MultiVantage software or the IPSI processes), retransmission will be requested for lost packets. All should be minimized; however, this link is less sensitive to delay than voice links. Above 100ms users may notice sluggishness in the user interface. Above 300ms or with significant packet loss there will be excessive retransmission at the application layer that will bring the link down Network Convergence Time: This is the time it takes for a router to update its routing tables, especially after a network outage or disturbance. S8700/G600 may have IP endpoints or G600s at points in the network where outages could affect their performance. DJ 2002 Avaya Inc. All rights reserved. (S8700/G600) Network Requirements 5

6 Recommended: <=10 sec. Required: <=60 sec. Rationale: While the network is converging, voice (RTP) traffic and signaling are blocked. Using OSPF, 10sec convergence is attainable in most cases. While the network is converging, the user will experience degraded performance. Specifically: All active calls remain in a connected state. Calls, where the bearer traffic is interrupted, will have a gap in voice transmission; No new calls -- IP or conventional -- can be originated, conferenced or terminated while the IPSI-link is down. During the network outage Avaya MultiVantage software on the S8700 Server will not be able to update the state of the G600. The software will re-synchronize the G600 with background messages when connectivity is re-established. This causes minimal disruption, for calls in stable states when the outage is less than 60 seconds. When a network outage lasts more than 60 seconds, the G600 will be reset, dropping all calls. The service outage will continue, as the G600 is re-initialized (30 to 60 seconds) upon restoration of connectivity. The reset of the G600 will fully synchronize all end points with the server upon recovery. 3.0 Detailed Recommendations and Guidelines for the S8700/G600 To meet the requirements and recommendations set forth in the previous section, this section gives recommendations on configuration and design. Section 0 outlines procedures for estimating the traffic generated by S8700/G600 and can be used for network design. S8700/G Media Server and G600s co-located, LAN (Layer 2) requirements S8700/G600 has no unique requirements for the LAN (Layer 2). The document Avaya IP Voice Quality Network Requirements Issue [Reference Document 1] provides Avaya s recommendations. Recommended: A managed, switched, fast Ethernet LAN with low occupancy and adequate segmentation or VLANs to reduce broadcast interference. Note: File Servers, Print Servers and Internet access on the same subnet as the S8700 server or G600 media gateway interfaces can cause performance issues Media Server and Media Gateway interfaces S8700 network interfaces and G600 network interfaces (IPSIs, CLANs and Media Processors) should be treated with the same care that any server interfaces are treated in your network. They should be on a reliable subnet that is dedicated or has low traffic. Required: Static IP addresses for all server interfaces. See the Job Aids: [reference documents 6 and 7] Required: S8700 Media Server interfaces must be on the same subnet. Rational: This is required for the IP-takeover by the active server to work. 6DJ 2002 Avaya Inc. All rights reserved. (S8700/G600) Network Requirements

7 Note: CLANs and Media Processors may be on any subnet. Note: If the ethernet switch speed and duplex are set, then the S8700 Media Server/G600 Media Gateway interfaces must be set as well. If ethernet switch is auto-negotiate, then the S8700/G600 interfaces must be auto-negotiate as well VLAN and QoS S8700/G600 has the capability to set the priority bits (IEEE 802.1p/Q) on the S8700 Media Server, IPSI, Media Processor, IP phones and some CLAN (TN799D, R11.5) interfaces. See the Installation Manual [ 3 ] for interface specifics. Required: An environment with low loss and low delay for signaling and voice traffic. This may or may not be achievable without 802.1p/Q Recommended: Place voice traffic and signaling on dedicated Voice VLANs. Priority bits should be set high (either 5 or 6), with data traffic set low (typically 0). Signaling priority should be no lower than voice priority. Typical: The network administrator will assign VLAN ID(s) for voice, and implement policies in the switch to give the Telephony traffic (Voice and Signaling) high priority. Server ports on the S8700/G600 will be assigned dedicated ports on the switch, which will tag packets with appropriate VLAN ID and priority. Optionally: The VLAN priority tagging can be done on the IPSIs and the Server. Priority and VLAN ID can be tagged on the Media Processor and CLAN (R11.5). 3.2 Routed Environments Most installations will be large enough to need multiple subnets. In these cases layer 3 routing and switching will be involved. This will add delay, sources of jitter, and packet loss. There will also be more failure points and additional complexity. Redundancy, multiple paths, and routing protocols will need to be considered. The delay/loss/jitter requirements in Section 0 must be met, as well as considerations for network failures and reconfiguration Routers and Layer 3 switches Most modern routers easily can meet these general requirements. It is the responsibility of the network administrator to assure that network requirements can be met. Required: Routers that can meet the transport requirements in the network installation for the voice and data traffic Recommended: Routers that support OSPF, DSCP, and at least two levels of egress queues. Typical: Cajun 330R, P580, or P882. Note: Carefully consider the utilization of your router, implementing DSCP (diffserv) and additional quality policies will increase router processor load. If CRTP is to be used on edge routers, processor load and delay can both be affected. DJ 2002 Avaya Inc. All rights reserved. (S8700/G600) Network Requirements 7

8 3.2.2 Network Topology Avaya recommends a Core: Distribution: Access topology. This topology will best enable the network administrator to control the impairments to telephony traffic. Consider redundant paths to meet reliability goals Routing Protocols Network convergence time, the time to recover from changes and outages, is critical. OSPF or a comparable routing protocol is required. Older protocols like RIP will reconfigure the network, but cannot deliver the fast recovery times of OSPF DSCP, TOS and QoS CoS tagging and QoS policy will need to be implemented at the IP layer. If you have modern routers, a DSCP value of 46 (expedited forwarding) is recommended. Older routers may have trouble with 46, in these case a value of 40 is recommended since this value is backward compatible with TOS. A two tier QoS policy, with high priority for voice and voice signaling and lower priority for all other traffic is recommended for reliable (i.e. low delay/jitter/loss) performance on the network. IPSI traffic should be handled with a priority higher than data but no higher than voice Remoted G600, WAN requirements Remoted users and G600s are tremendous features with S8700/G600, and engineering WAN connections for low cost and adequate performance is the challenge. The network designer must balance cost (both WAN links and equipment), VoIP performance (delay, loss, jitter), data application performance, and reliability. If the WAN link to a remoted G600 fails, NO PHONE SERVICE WILL BE AVAILABLE at the remote location. Complete design guidelines are beyond the scope of this document. An outline of the procedure is given here. Understand the existing and projected non-voip related traffic. Estimate the additional traffic for telephony signaling and voice. Section 0 has general guidelines; a document [ 2 ] will be found or written to give detailed instructions. Implement QoS policies that provide Expedited Forwarding (DSCP 46) like behavior for the real-time voice and Assured Forwarding (34) like behavior for telephony signaling traffic. CoS tagging can be performed by S8700/G600. Reread the service level agreement (SLA) for the WAN(s) that will be used.. Understand the delay, jitter, CIR if appropriate, error rate and committed reconfiguration times. Compare this with current performance if possible. Consider compression to reduce BW on WAN links. There is a delay and router cost trade-off here. Start with G.729, 30ms packet codecs. Engineer to less than 50-75% occupancy on the WAN links. Take action if this will not be achievable with the VoIP implementation. Higher occupancies can be achieved and tolerated with appropriate QoS policies. Calculate the delay budget; verify that the requirements in section 0 can be met. 8DJ 2002 Avaya Inc. All rights reserved. (S8700/G600) Network Requirements

9 3.3 Estimating BW required by a S8700/G600 Installation. There are three components to the traffic generated by S8700/G600: IPSI-link VoIP bearer traffic, both endpoint to endpoint, and inter-g600 for non-ip endpoints. VoIP signaling traffic. Of these three, VoIP bearer traffic is the largest component in LAN and almost all WAN implementations. VoIP bearer traffic will have the greatest contribution. Generally VoIP bearer and VoIP signaling will travel the same network routes and if the network is designed well for uncompressed bearer, the signaling will not be a problem. In the case of a remoted port network, the IPSI-link may have a significant contribution over the WAN link. As stated earlier, interruptions in the IPSI-link can take a large number of users out of service. Estimation of bearer traffic is similar for all ECLIPS products IPSI-link Traffic Level An estimate of the traffic required for the IPSI-link (add appropriate LAN, PPP, or FR overheads) can be approximated: Idle: 10kbps downlink (S8700 to G600), 5kbps uplink (G600 to S8700). There will be additional traffic during periodic maintenance. Add 6kbps downlink, 3kbps uplink for every thousand busy hour calls. These values are derived from prototype measurements. Check for updates Voice (Bearer) Traffic. Detailed estimation of bearer traffic is beyond the scope of this document; [see reference document 5]. Bearer traffic will depend on: Call volume Codec Selection Packet Size Silence Suppression. Note: When discussing WAN bandwidths, they are usually specified as one-way bandwidths, LAN bandwidths are usually specified for the switch, subnet or collision domain and one-way bandwidths need to be doubled. Double-check the source to be sure the appropriate bandwidths calculations are made.. Call volume should be estimated from the current usage, intended traffic type (Call center, Typical office, low volume) and number of users. Each IP end point will be a source of bearer traffic, as will inter-g600 calls. Use CMDR records where possible to estimate call volume. Choosing a codec is a voice quality vs. bandwidth trade-off. Avaya endpoints support a wide variety of standard codecs to be compatible with a wide variety of products. Recommended: G.711 for LAN connections and G.729 for WAN connections. Avaya MultiVantage Software can be administered to allow endpoints to choose different codecs for inter-region and intra-region calls. DJ 2002 Avaya Inc. All rights reserved. (S8700/G600) Network Requirements 9

10 Smaller packets provide less delay and higher overheads. Packet sizes greater than 40ms provide marginal reduction in overheads. Choose a packet size that meets the bandwidth and delay budgets. Avaya IP telephones have a nominal 70ms delay (30ms encode, 40ms decode) for a 20ms packet using the G.711 codec. Delay is increased proportionally to the packet size and G.729 has more encoding delay then G.711 Recommended: Use a 30ms, G.729 packet on WAN connections. Consider 40ms if the delay budget allows and bandwidth is an issue. Suppressing the quiet portions of a conversation can significantly (30-50%) reduce the bandwidth on a call. It can also significantly reduce the perceived quality. The choice to implement silence suppression depends on end user expectations and needs. Recommended: Do not enable silence suppression unless bandwidth constraints are severe and the users are aware of the quality impairments Signaling. This is the control information from the CLAN board to the sets. Typically this will be contained within a network region and remain within a LAN. Where individual terminals are remoted across a WAN link, this traffic level must be considered. 4.0 Applications required and recommended. Several applications are needed or useful for installing and maintaining any ECLIPS system. Because the S8700/G600 is very IP centric, a rich tools set is recommended. DHCP is strongly recommended to initialize the sets. There are no DHCP needs or requirements for the Server or Media Gateways. The DHCP server on the S8700 cannot be enabled. TFTP is required to initialize the sets. There are no TFTP needs or requirements for the Server or Media Gateways. The TFTP server on the S8700 cannot be enabled. No FTP Server is required, but is recommended. An FTP server can be used as a backup for translations and systems files. An FTP client is needed for FW download and to load license files. No Telnet client is required. ASA is recommended for SAT access. If telnet is used, the Windows NT client is the most compatible. (Choose term type NTT on SAT screen). Port 5023 accesses the SAT processes. Avaya Site Administration (ASA) is provided on the standard distribution of the S8700. It can be downloaded to a Windows PC. This is the preferred SAT administration application. No Network Management is required, but use is strongly recommended. SNMP MIBs are supported on: CLAN, S8700, and 46xx sets. A management suite like Avaya VisAbility Suite or HP Openview will be a tremendous advantage in maintaining the network with tighter VoIP requirements. Ping and Traceroute: Still the most useful tools for verifying connectivity. 10 DJ 2002 Avaya Inc. All rights reserved. (S8700/G600) Network Requirements

11 5.0 Quality of Service (QoS) Policies Quality of Service design is beyond the scope of this document. In an S8700/G600 implementation some general rules apply. Note: Implement QoS policies to maintain signaling during voice or data generated congestion. 6.0 Conclusion Establishing a VOIP solution using the Avaya MultiVantage Software on an Avaya S8700 Media Server and an Avaya G600 Media Gateway within the parameters recommended in this document will optimize the voice quality of the network and provide assurances of reliable performance exceeding the expectations of most end users Avaya Inc. All Rights Reserved. Avaya and the Avaya Logo are trademarks of Avaya Inc. or Avaya ECS Ltd., a wholly owned subsidiary of Avaya Inc. and may be registered in the U.S. and other jurisidictions. Avaya trademarks identified by and are registered trademarks or trademarks, respectfully, of Avaya Inc. All other trademarks or registered trademarks are the property of their respective owners. DJ 2002 Avaya Inc. All rights reserved. (S8700/G600) Network Requirements 11

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