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1-4

Cisco PNNI Network Planning Guide  for MGX and SES Products, Release 5

Part Number OL-3847-01 Rev. D0, April, 2004

Chapter 1      Introduction to PNNI

The Hierarchical PNNI Network Topology

Note

Hierarchical PNNI networks are not supported on Cisco MGX 8850 switches before Release 2.1.60, and 
they are not supported on the SES PNNI Controller before Release 1.1.60.

Figure 1-2

Example Hierarchical PNNI Network Topology Showing Multiple Peer Groups

Notice that the only difference between the single peer group in 

Figure 1-1

 and the hierarchical PNNI 

network in 

Figure 1-2

 is the grouping of the nodes. This grouping of the nodes creates smaller PNNI 

databases within the nodes in each peer group and reduces the PNNI processing requirements in each 
node. This grouping also provides room to add more nodes in each of the groups.

In a hierarchical network, the database for each peer group is smaller because the peer group collects, 
stores and processes PTSEs for only those nodes in the same peer group. The nodes within a peer group 
do receive information on other peer groups, but the information is summarized. From the perspective 
of an individual peer group, other peer groups appear to be single nodes. Nodes within one peer group 
do not receive PTSEs from other peer groups and therefore do not collect, store, and process information 
about all the individual nodes and links in other peer groups.

The Cisco switches described in this guide support up to 32 visible peer groups in one network. (The 
specifications for Cisco switches are described in 

Table 2-1

 in 

Chapter 2, “Interoperability and 

Performance Planning.”

) A visible peer group is a peer group with which the local peer group can 

communicate. Because each visible peer group appears as a logical group node (LGN), each visible peer 
group reduces the available node count for a peer group. For example, if the local peer group discovers 
32 visible peer groups, the node count for the local peer group is reduced to 128 (160 - 32 = 128).

Figure 1-3

 demonstrates why a multiple peer group PNNI network is called a hierarchical PNNI 

network.

66058

PNNI networks

Peer group 1

Peer

group 2

Peer

group 3

Peer

group 4

Peer

group 5

Содержание Network Router

Страница 1: ...0 West Tasman Drive San Jose CA 95134 1706 USA http www cisco com Tel 408 526 4000 800 553 NETS 6387 Fax 408 526 4100 Cisco PNNI Network Planning Guide for MGX and SES Products Release 5 Release 5 April 14 2004 Text Part Number OL 3847 01 Rev D0 ...

Страница 2: ...TAL DAMAGES INCLUDING WITHOUT LIMITATION LOST PROFITS OR LOSS OR DAMAGE TO DATA ARISING OUT OF THE USE OR INABILITY TO USE THIS MANUAL EVEN IF CISCO OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES CCIP CCSP the Cisco Arrow logo the Cisco Powered Network mark Cisco Unity Follow Me Browsing FormShare and StackWise are trademarks of Cisco Systems Inc Changing the Way We Work Liv...

Страница 3: ...xvii Finding Documentation for Cisco MGX BPX SES and CWM Products xxviii Changes to This Document xxviii Documentation Feedback xxix Obtaining Technical Assistance xxix Cisco TAC Website xxix Opening a TAC Case xxix TAC Case Priority Definitions xxx Obtaining Additional Publications and Information xxx C H A P T E R 1 Introduction to PNNI 1 1 The PNNI Network Database 1 1 The Single Peer Group Top...

Страница 4: ...uidelines for Hierarchical Networks 2 7 Planning Guidelines for Peer Group Leaders 2 7 Planning Guidelines for Border Nodes 2 7 C H A P T E R 3 Address and Closed User Group Planning 3 1 Address Planning Overview 3 1 Planning Address Configuration Settings 3 3 Selecting an ATM Address Format 3 3 Supported Address Formats 3 4 Guidelines for Selecting an Address Format 3 5 Address Registration Autho...

Страница 5: ... 1 How MGX and SES Nodes Select Routes 4 1 Link and Route Metrics 4 1 Administrative Weight 4 1 Cell Transfer Delay 4 2 Cell Delay Variation 4 2 Available Cell Rate 4 2 Maximum Cell Rate 4 3 Shortest Path Table Routing 4 3 The Shortest Path Tables 4 3 How SVCs and SVPs use the SPTs 4 5 How SPVCs and SPVPs use the SPTs 4 5 On Demand Routing 4 6 Load Balancing for SPT and On Demand Routing 4 6 How M...

Страница 6: ...Contents vi Cisco PNNI Network Planning Guide for MGX and SES Products Release 5 Part Number OL 3847 01 Rev D0 April 2004 ...

Страница 7: ...vel Hierarchy 1 5 Figure 1 4 Simple Node Representation 1 7 Figure 1 5 Complex Node Representation 1 7 Figure 1 6 Example PNNI Internetworking with AINI Topology 1 9 Figure 3 1 PNNI Addressing Example 3 2 Figure 3 2 Supported ATM Address Formats 3 4 Figure 3 3 PNNI Network Physical Topology 3 7 Figure 3 4 MPG WAN Topology 3 7 Figure 3 5 Default Peer Group ID 3 10 Figure 3 6 20 byte Node Address 3 ...

Страница 8: ...Figures viii Cisco PNNI Network Planning Guide for MGX and SES Products Release 5 Part Number OL 3847 01 Rev D0 April 2004 ...

Страница 9: ...ng Specifications for MGX Switches and the MGX 8880 Media Gateway 2 2 Table 2 2 PNNI Networking Specifications for SES Equipped BPX Switches 2 3 Table 2 3 Switch and CWM Connection Units for Each Connection Type 2 4 Table 3 1 ATM Address Components 3 5 Table 3 2 Address Registration Authorities 3 6 Table 3 3 Recommended PNNI Level Values 3 9 Table 3 4 Nodal Address Worksheet 3 18 Table 3 5 Port Ad...

Страница 10: ...Tables x Cisco PNNI Network Planning Guide for MGX and SES Products Release 5 Part Number OL 3847 01 Rev D0 April 2004 ...

Страница 11: ... 8880 Media Gateway Release 5 0 and higher Cisco MGX 8950 Release 2 1 60 and higher Cisco BPX 8600 and Cisco Service Expansion Shelf SES with SES Release 1 0 or later software Audience The Cisco PNNI Network Planning Guide for MGX and SES Products Release 5 helps network architects and planners identify the information they need to provide to the personnel that will install and configure the PNNI ...

Страница 12: ...e these conventions Terminal sessions and information the system displays are in screen font Information you enter is in boldface screen font Nonprinting characters such as passwords are in angle brackets Default responses to system prompts are in square brackets Note Means reader take note Notes contain helpful suggestions or references to materials not contained in this manual Caution Means read...

Страница 13: ... for these multiservice switches Cisco MGX 8850 PXM1 Cisco MGX 8230 Cisco MGX 8250 Cisco VXSM Release 5 The Voice Switch Service Module VXSM card is new for this release Cisco WAN Manager Release 15 The Cisco WAN Manager CWM network management software is improved for this release The previous release of CWM was 12 CWM Release 15 introduces a helpful new documentation feature web based online Help...

Страница 14: ...5 Cisco WAN Manager User s Guide Release 15 Step 4 If your network contains MGX and SES products refer to this manual for planning information Cisco PNNI Network Planning Guide for MGX and SES Products Step 5 Refer to these manuals for information about installing cards and cables in the MGX chassis Cisco MGX 8850 PXM1E PXM45 Cisco MGX 8950 Cisco MGX 8830 and Cisco MGX 8880 Hardware Installation G...

Страница 15: ...and Command Reference for MGX Switches Release 5 Cisco Circuit Emulation Services CESM MPSM Configuration Guide and Command Reference for MGX Switches Release 5 Information about how to install or upgrade to the MPSM 8 T1E1 card in Cisco MGX 8230 Cisco MGX 8250 and Cisco MGX 8850 PXM1 switches is in the Release Notes for Cisco MGX 8230 Cisco MGX 8250 and Cisco MGX 8850 PXM1 Switches Release 1 3 00...

Страница 16: ... Installation Warning Card DOC 7812348 x x x x x x x x x Regulatory Compliance and Safety Information for Cisco Multiservice Switch and Media Gateway Products MGX BPX and SES DOC 7814790 x x x x x x x x Release Notes for the Cisco MGX 8880 Media Gateway Release 5 0 00 OL 5190 01 x Release Notes for Cisco MGX 8850 PXM1E PXM45 Cisco MGX 8950 and Cisco MGX 8830 Switches Release 5 0 00 OL 4538 01 x x ...

Страница 17: ... Edge Concentrator Overview Release 1 1 31 DOC 7811576 x Cisco MGX 8850 Multiservice Switch Overview Release 1 1 31 OL 1154 01 x Hardware Installation Guides Cisco MGX 8850 PXM1E PXM45 Cisco MGX 8950 Cisco MGX 8830 and Cisco MGX 8880 Hardware Installation Guide Releases 2 Through 5 OL 4545 01 x x x x x Cisco Service Expansion Shelf Hardware Installation Guide Release 11 DOC 786122 x Table 1 Techni...

Страница 18: ...L 4552 01 x x x x x Cisco MGX 8850 Edge Concentrator Installation and Configuration Release 1 1 31 DOC 7811223 x Cisco SES PNNI Controller Software Configuration Guide Release 31 DOC 7814258 x Cisco MGX 8230 Edge Concentrator Installation and Configuration Release 1 1 31 DOC 7811215 x Cisco MGX 8250 Edge Concentrator Installation and Configuration Release 1 1 31 DOC 7811217 x Table 1 Technical Man...

Страница 19: ...ervices FRSM MPSM Configuration Guide and Command Reference for MGX Switches Release 52 OL 4541 01 2 2 2 x x x Cisco Circuit Emulation Services CESM MPSM Configuration Guide and Command Reference for MGX Switches Release 52 OL 0453 01 2 2 2 x x x Cisco MGX Route Processor Module RPM XF Installation and Configuration Guide Release 41 OL 5087 01 x x Cisco ATM Services AXSM Configuration Guide and Co...

Страница 20: ...nce Guides Cisco MGX 8230 Multiservice Gateway Error Messages Release 1 1 31 DOC 78112113 x Cisco MGX 8230 Multiservice Gateway Command Reference Release 1 1 31 DOC 7811211 x Cisco MGX 8250 Multiservice Gateway Command Reference Release 1 1 31 DOC 7811212 x Cisco MGX 8250 Multiservice Gateway Error Messages Release 1 1 31 DOC 7811216 x Cisco MGX 8800 Series Switch Command Reference Release 1 1 31 ...

Страница 21: ...isco MGX 8880 Command Reference Release 5 OL 4547 01 x x x x x Cisco WAN Manager SNMP Service Agent Release 15 OL 4551 01 x x x x x Cisco WAN Manager Database Interface Guide Release 15 OL 4587 01 x x x x x Cisco MGX and Service Expansion Shelf Error Messages Release 5 OL 4553 01 x x x x x x 1 This document was not updated for the April 2004 release 2 Some configuration and command information is ...

Страница 22: ...ocuments are available only online This guide ships with product Installation Warning Card DOC 7812348 Contains precautions that you should take before you insert a card into a slot This Warning Card ships with product Regulatory Compliance and Safety Information for Cisco Multiservice Switch and Media Gateway Products MGX BPX and SES DOC 7814790 Provides regulatory compliance information product ...

Страница 23: ...s for provisioning connections and managing the new MPSM 8 T1E1 card as an FRSM card replacement Cisco MGX 8230 Edge Concentrator Installation and Configuration Release 1 1 3 DOC 7811215 Provides installation instructions for the Cisco MGX 8230 edge concentrator Cisco MGX 8230 Edge Concentrator Overview Release 1 1 3 DOC 7812899 Describes the system components and function of the Cisco MGX 8250 ed...

Страница 24: ...troller card and supports only serial bus based service modules This hardware installation guide replaces all previous hardware guides for these switches Cisco MGX 8850 PXM1E PXM45 Cisco MGX 8950 Cisco MGX 8830 and Cisco MGX 8880 Configuration Guide Release 5 OL 4546 01 Describes how to configure the Cisco MGX 8880 Media Gateway Also describes how to configure Cisco MGX 8850 PXM1E Cisco MGX 8850 P...

Страница 25: ...ion Shelf Hardware Installation Guide Release 1 DOC 786122 Provides instructions for installing and maintaining an SES controller Cisco SES PNNI Controller Command Reference Release 3 DOC 7814260 Describes the commands used to configure and operate the SES PNNI controller Cisco SES PNNI Controller Software Configuration Guide Release 3 DOC 7814258 Describes how to configure operate and maintain th...

Страница 26: ... 8850 PXM45 switch Release Notes for Cisco MGX 8230 Cisco MGX 8250 and Cisco MGX 8850 PXM1 Switches Release 1 3 00 OL 4539 01 Provides new feature upgrade and compatibility information as well as information about known and resolved anomalies Release Notes for Cisco MGX 8850 PXM1E PXM45 Cisco MGX 8950 and Cisco MGX 8830 Switches Release 5 0 00 OL 4538 01 Provides new feature upgrade and compatibil...

Страница 27: ...d doc es_inpck pdi htm You can order Cisco documentation in these ways Registered Cisco com users Cisco direct customers can order Cisco product documentation from the Ordering tool http www cisco com en US partner ordering index shtml Nonregistered Cisco com users can order documentation through a local account representative by calling Cisco Systems Corporate Headquarters California USA at 408 5...

Страница 28: ...x htm and look for the CWM release number For all other documents in your browser s URL field enter http www cisco com univercd cc td doc product wanbu index htm Look for the switch name and release number For example look for MGX 8850 PXM1E then Release 5 Changes to This Document Table 4 summarizes the changes made to this guide since the previous release Table 4 Changes to This Book Since the Pr...

Страница 29: ...TAC website is available 24 hours a day 365 days a year The Cisco TAC website is located at this URL http www cisco com tac Accessing all the tools on the Cisco TAC website requires a Cisco com user ID and password If you have a valid service contract but do not have a login ID or password register at this URL http tools cisco com RPF register register do Opening a TAC Case Using the online TAC Ca...

Страница 30: ...nal Publications and Information Information about Cisco products technologies and network solutions is available from various online and printed sources Cisco Marketplace provides a variety of Cisco books reference guides and logo merchandise Go to this URL to visit the company store http www cisco com go marketplace The Cisco Product Catalog describes the networking products offered by Cisco Sys...

Страница 31: ...is a quarterly journal published by Cisco Systems for engineering professionals involved in designing developing and operating public and private internets and intranets You can access the Internet Protocol Journal at this URL http www cisco com ipj Training Cisco offers world class networking training Current offerings in network training are listed at this URL http www cisco com en US learning i...

Страница 32: ...xxxii Cisco PNNI Network Planning Guide for MGX and SES Products Release 5 Part Number OL 3847 01 Rev D0 April 2004 About This Guide Obtaining Additional Publications and Information ...

Страница 33: ...ides guidelines on how you can apply these topologies using the following switches Cisco MGX 8830 Release 3 0 and higher Cisco MGX 8850 PXM1E Release 3 0 and higher Cisco MGX 8850 PXM45 Release 2 0 and higher Cisco MGX 8880 Media Gateway Release 5 0 and higher Cisco MGX 8950 with Release 2 1 60 or later software Cisco BPX 8600 and Cisco Service Expansion Shelf SES with SES Release 1 0 or later sof...

Страница 34: ... five common reasons for updating PTSEs are as follows Resources administratively added removed or altered on a node Resource failure such as an Loss of Signal LOS on a link A significant change in link resources due to virtual circuits VCs routing or derouting Periodic updates defined by the PTSE refresh and PTSE lifetime interval timers A processor switch module PXM switchover PTSE information i...

Страница 35: ...up grows the PNNI database within the node grows as does the PNNI processing requirements When the network size increases beyond the capabilities of the network nodes you can connect the single peer group network to other networks to create the following types of topologies The Hierarchical PNNI Network Topology PNNI Internetworking with AINI PNNI Internetworking with IISP The hierarchical PNNI to...

Страница 36: ...e same peer group The nodes within a peer group do receive information on other peer groups but the information is summarized From the perspective of an individual peer group other peer groups appear to be single nodes Nodes within one peer group do not receive PTSEs from other peer groups and therefore do not collect store and process information about all the individual nodes and links in other ...

Страница 37: ...vel 40 nodes The level 40 nodes in Figure 1 3 are all part of the same level 40 peer group and exchange PTSEs in the same way as do the lower level nodes The level 40 LGN for each peer group in Figure 1 3 is called a peer group leader and provides summarized information to its child peer group about the other peer groups represented at level 40 Each peer group leader also provides summarized peer ...

Страница 38: ... from levels above the PGL is also summarized and distributed to child peer groups Network administrators can use configuration commands to control which node becomes the PGL The configuration process assigns a PGL election priority to each node in the peer group When PNNI nodes start up an election is held to determine which node has the highest PGL priority and that node becomes the PGL If the P...

Страница 39: ...ative to simple node representation is complex node representation When complex node representation is enabled for a LGN the LGN presents additional information about the peer group it represents Figure 1 5 illustrates complex node representation Figure 1 5 Complex Node Representation The default complex node representation presents the peer group as a node with multiple ports A logical nucleus is...

Страница 40: ...rting traffic traveling in and out of the peer group Hierarchical PNNI Network Benefits The primary benefit of a hierarchical PNNI network is scalability Single peer group networks are limited to 160 nodes but hierarchical networks can support many more nodes For networks with less than 100 nodes a single peer group will usually provide superior performance over a hierarchical network because an o...

Страница 41: ...urpose as AINI which is to link two independent PNNI networks Unlike AINI IISP does not support all UNI 4 0 features Note Standards based IISP supports SVC and SVP connections Cisco has enhanced IISP to also support CBR1 rt VBR1 rt VBR2 rt VBR3 nrt VBR1 nrt VBR2 and ABR SPVC and SPVP connections If the border nodes between two independent PNNI networks support AINI you should use AINI for any link...

Страница 42: ...1 10 Cisco PNNI Network Planning Guide for MGX and SES Products Release 5 Part Number OL 3847 01 Rev D0 April 2004 Chapter 1 Introduction to PNNI PNNI Internetworking with IISP ...

Страница 43: ...nterface PNNI Version 1 User Network Interface UNI 3 0 UNI 3 1 UNI 4 0 Integrated Local Management Interface ILMI 4 0 ATM Inter Network Interface AINI 1 0 Interim Inter Switch Protocol IISP 3 0 and 3 1 Traffic Management TM 4 0 Specifications Table 2 1 lists PNNI network specifications for MGX switches and the MGX 8880 Media Gateway Table 2 2 lists PNNI network specifications for SES equipped BPX ...

Страница 44: ...commended 32 32 32 32 32 32 32 PNNI nodes per lowest level MPG peer group recommended 1 128 128 128 128 128 128 128 PNNI links per switch maximum PXM1E PXM452 PXM45 B PXM45 C 99 99 100 100 100 192 192 192 192 32 32 32 PNNI links per peer group maximum 3400 3400 3400 3400 3400 3400 3400 Preferred routes per switch maximum PXM1E PXM452 PXM45 B PXM45 C 5000 5000 5000 5000 10000 5000 10000 5000 5000 5...

Страница 45: ...his recommendation is based on normal memory usage within the switch 2 PXM45 which is the first released version of the PXM45 card and is sometimes called PXM45A is not supported on Release 5 switches 3 Connections limits are calculated differently for a switch and for CWM For more information refer to the following section Connection Limit Adjustments Table 2 2 PNNI Networking Specifications for ...

Страница 46: ...Cs and SPVCs 1 50 K 50 K 100 k 100 k Physical ATM interfaces per switch maximum 100 100 100 100 Preferred routes per switch maximum 1000 1000 P2MP root connections per switch 500 P2MP branches per switch 12 P2MP parties allowed per root connection 100 P2MP parties per switch 1 K 1 Connections limits are calculated differently for a switch and for CWM For more information refer to the following sec...

Страница 47: ...all redundant hardware in switches Install parallel links between adjacent switches Set up multiple links between adjacent peer groups Use multiple links when connecting to an external network Provide multiple communication paths between any two nodes that will communicate with each other The following sections provide additional information on these guidelines Install Redundant Hardware in Switch...

Страница 48: ...nation switches It is also a good design practice to distribute paths across multiple service modules so that a service module failure does not disrupt all communications between two nodes Planning Guidelines for Individual Peer Groups The first step in planning a PNNI topology is to determine if all network nodes will participate in one peer group or in hierarchical peer groups The single and hie...

Страница 49: ...s Peer group leaders are the logical nodes that represent their peer group at the next higher level in the PNNI hierarchy Peer group leaders are introduced in Chapter 1 Introduction to PNNI When planning for peer group leaders consider the following facts and guidelines For a peer group to communicate with another peer group the peer group must have at least one node that is capable of acting as p...

Страница 50: ...isco PNNI Network Planning Guide for MGX and SES Products Release 5 Part Number OL 3847 01 Rev D0 April 2004 Chapter 2 Interoperability and Performance Planning Planning Guidelines for Hierarchical Networks ...

Страница 51: ... determined by two ATM End Station Addresses AESAs a source and a destination When a connection is being established the source PNNI routing node looks up the destination address in PNNI routing tables If the routing tables do not contain a satisfactory predefined route the switch uses the PNNI topology database to search for a route Routing decisions are made based on many criteria as discussed i...

Страница 52: ...not preclude the use of non conforming addresses For example if network management dictates the use of a specific non conforming ATM address for a destination that address can be manually entered at the switch and PNNI will advertise a route to that device The non conforming address is called a foreign address The support of foreign addresses makes PNNI more flexible but keep in mind that excessiv...

Страница 53: ...950 Cisco MGX 8830 and Cisco MGX 8880 Configuration Guide Release 5 Cisco SES PNNI Controller Software Configuration Guide Release 3 Planning Address Configuration Settings Use the following steps to create a WAN address plan Step 1 Select an ATM address format Step 2 Select a PNNI level Step 3 Select the PNNI peer group ID Step 4 Select the ATM address Step 5 Select the ILMI address prefix Step 6...

Страница 54: ...lt address format for the Cisco MGX and SES switch products is the ICD format In the PNNI network native E 164 addresses are mapped to an E 164 AESA format The native AESA is inserted as a left justified IDI portion of the AESA with the semi octet Hex FFFF padded to form an integral byte at the end This left justified rule may be changed to right justified via CLI if needed The substructures of th...

Страница 55: ...any or campus This identification is useful when you are deploying a WAN that will be accessed by several campuses or sites Native E 164 addresses can be embedded in the AESA Enter the address format or formats that you select into the Nodal Address Worksheet Table 3 4 which appears at the end of this chapter Note Local AFIs should not be used for addressing within ATM Service Provider networks Ta...

Страница 56: ...for Organizations for Telecommunications Addressing IOTA http www bsi global com DISC Working Withyou Naming Addressing xalter DCC 1 ISO National Administrative Authority Registration Authority 2 List of authorities US American National Standards Institute ANSI Germany Deutsche Industrie Normen DIN E 164 International Telecommunications Union ITU the National Numbering Authority Private networks A...

Страница 57: ...e and the CPE that connect to it To distribute information about all the nodes in the WAN the PNNI switches send PNNI Topology State Element PTSE messages to each other on a regular basis In a small WAN an SPG application is appropriate When the WAN grows beyond 100 nodes PTSE distribution and the size of the node PNNI databases begins to affect network performance At this point you might want to ...

Страница 58: ...ups Level 40 nodes do not store the routing details stored within the level 56 peer groups because that information is already stored at the lower level The level 40 nodes only store the information that the level 56 nodes need to locate and communicate with other peer groups If the network shown in Figure 3 4 were to grow until there were more than 100 LGNs at level 40 the level 40 peer group cou...

Страница 59: ...t 8 bits byte 1 are reserved for the AFI and must be set to a fixed value Also if the address format you choose is DCC AESA or ICD AESA you can create only one peer group for each DCC or ICD Table 3 3 Recommended PNNI Level Values Level Peer Group ID Portion of ATM Address Peer Group ID Length Bytes 8 11 xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx 1 16 11 22 xx xx xx xx xx xx xx xx xx...

Страница 60: ...in the peer group ID are used to make it easier to read the peer group ID To create a second peer group at the same default level you must modify the unique portion of the peer group ID For example 56 47 00 9181 0000 01 Note Only the unique portion of the peer group ID which is defined by the PNNI level is used to identify the peer group In the example of the default level 56 the first 7 bytes of ...

Страница 61: ...ts The unique portion of the default node address is the 6 byte MAC address which is used in bytes 8 through 13 and again in bytes 14 through 19 Byte 20 which is the selector byte is set to 00 by default Note Cisco recommends that you change the Cisco ICD portion of the address 0091 This number is registered to Cisco and using it will cause conflicts if the network you create is ever connected to ...

Страница 62: ...fix If you set up soft permanent virtual connections SPVCs the port at each end of the connection must have a globally unique SPVC address This address is generated by the switch when the connection is defined and consists of the SPVC prefix and an internally generated number that identifies the port The default SPVC prefix is the first 13 bytes of the default ATM address which consists of the 7 b...

Страница 63: ...you The same address or summary address can be configured on more than one port and multiple addresses can be configured on each port Because the destination devices are not part of the PNNI network IISP address prefixes do not have to conform to the PNNI level peer group ID or node prefix Enter any AINI or IISP prefixes into the Port Address Worksheet Table 3 5 which appears at the end of this ch...

Страница 64: ... that it cannot originate calls to other CUG 1 members but it can accept calls from other members Configuration options allow a network user to be further restricted when originating calls to or receiving calls from network users outside of any CUG membership defined for the network user In Figure 3 7 CPE E is not a member of any CUG and the default configuration for CUG members will prevent commu...

Страница 65: ...tions When selecting an interlock code consider the following guidelines The interlock codes should be managed so that an existing interlock code is not selected for a new CUG Other than being unique to a single CUG there is no requirement on the contents of the interlock code When planning a CUG consider using the CUG Configuration Worksheet Table 3 6 which appears at the end of this chapter Each...

Страница 66: ...gnment you must specify the following The ATM address or prefix of a local UNI interface The length of the ATM address The ATM address plan which is either NSAP or E164 This information is required so that the switch interprets the address or prefix correctly If the prefix or address you are assigning to a CUG uses the NSAP format specify the address length in bits A full AESA is 160 bits 20 bytes...

Страница 67: ... disallowed per call and permanent The disallowed control does what its name implies The per call control enables outgoing calls when an outgoing CPE call specifically requests outside access and the permanent control permanently enables outgoing connections as if they were CUG membership connections Note The network administrator can set the external access during the initial CUG member configura...

Страница 68: ...signed to the default CUG address it is a good plan to specify one CUG as a preferential CUG When planning a default CUG address using the CUG Configuration Worksheet Table 3 6 remember that there can only be one default CUG address per switch If you want to assign more than one CUG to the default CUG address copy Table 3 6 for each CUG assignment and remember that the default CUG address or prefi...

Страница 69: ... for each CUG on a switch Remember that only one address or prefix can serve as the default CUG address on a switch and there can be only one preferred CUG per address or prefix Table 3 5 Port Address Worksheet Port ILMI Prefixes AINI and IISP Prefixes and Addresses UNI Addresses Table 3 6 CUG Configuration Worksheet CUG Interlock Code CUG Index Address or prefix Length Plan Internal Access calls ...

Страница 70: ...3 20 Cisco PNNI Network Planning Guide for MGX and SES Products Release 5 Part Number OL 3847 01 Rev D0 April 2004 Chapter 3 Address and Closed User Group Planning Worksheets ...

Страница 71: ...ional routing feature provided by MGX and SES nodes Link and Route Metrics Most route metrics are calculated based on the link metrics for each link along the route Because of this link and route metrics often use the same name or similar names This can be confusing if you do not consider the context in which the terms are used Link metrics apply when configuring an individual link or when choosin...

Страница 72: ...ell exiting the source node and entering the destination node The CTD used in MGX and SES nodes is a static value that is set by Cisco according to PNNI 1 0 standard and is based on the speed of the interface Faster interfaces will have lower CTD values and slower interfaces will have higher values Note Because the CTD is defined according to the PNNI 1 0 standard the CTD for any specific link spe...

Страница 73: ...xCR represents the maximum throughput available for PNNI connections and cannot be modified by the overbooking factor To block traffic for a particular service class over a link set the maxCR for that service class to 0 The maxCR for a route is equal to the lowest link maxCR along the route Shortest Path Table Routing Most routing attempts begin with a search for a route in the shortest path table...

Страница 74: ...Class of Service Tables column The service classes are defined in Table 4 2 Table 4 1 Pre calculated Routing Tables Traffic Metric Class of Service Tables AW CBR rt VBR nrt VBR ABR UBR CTD CBR rt VBR nrt VBR CDV CBR rt VBR Table 4 2 Supported Service Classes for MGX and SES Nodes Service Class Acronym Definition Guidelines CBR Constant bit rate Use to limit connections to a static amount of bandwi...

Страница 75: ...issing table the switch uses on demand routing to locate a conforming route for the connection How SVCs and SVPs use the SPTs SVCs and SVPs are initiated by CPE using UNI connections to the switch UNI versions 3 0 and 3 1 cannot request a CTD or CDV value for a connection so all UNI 3 0 and 3 1 connections are routed using the AW SPTs UNI 4 0 connections can request CTD and CDV values for a connec...

Страница 76: ...est fit When the controller is configured for first fit on demand route selection it selects the first route that satisfies all connection requirements When the controller is configured for best fit on demand route selection it identifies all routes that meet the call requirements and then it chooses the route based on the setting of the load balancing option Load Balancing for SPT and On Demand R...

Страница 77: ...is configured as a directed route no other route is allowed even if the route fails If the connection is not configured as a directed route other routes are considered when the preferred route is not available When other routes are required the switch can use the pre calculated routing tables or on demand routing Preferred routing was introduced in Release 3 0 00 and is supported on the MGX 8830 M...

Страница 78: ...using the cnfpnportsig command This routing priority also applies to the priority bumping feature Although you can change the routing priority after a connection is created you can eliminate reconfiguration by planning for priority routing before creating connections Tip The priority routing feature allows administrators to influence the order in which connections are routed or rerouted when netwo...

Страница 79: ...t want to review the priority bumping feature details before configuring connections and interfaces You can find more information on priority bumping in the Cisco MGX 8850 PXM1E PXM45 Cisco MGX 8950 Cisco MGX 8830 and Cisco MGX 8880 Configuration Guide Release 5 Blocking Pass Through Connections As a switch administrator you can configure MGX and SES nodes to support or deny connections that pass ...

Страница 80: ...ved data is forwarded to each party using the AESA As shown in Figure 4 1 each leaf can support multiple parties The current release of the P2MP feature on Cisco MGX switches operates on the service modules listed in Table 4 4 Slot multicasting or branching enables the PXM to branch an incoming P2MP connection to multiple service modules within the switch Port multicasting allows a service module ...

Страница 81: ...face or they can be spread out on multiple interfaces A leaf end point is an SVC endpoint Farthest node branching is a PNNI feature that takes advantage of branching when it is available Switch 1 could have originated a separate connection for each party on Switch 2 but this would have required 4 SVCs instead of 1 and all four would be carrying the same data Farthest node branching improves networ...

Страница 82: ...Cisco PNNI Network Planning Guide for MGX and SES Products Release 5 Part Number OL 3847 01 Rev D0 April 2004 Chapter 4 Planning Intermediate Route Selection Additional Routing Features in MGX and SES Nodes ...

Страница 83: ...node 3 18 worksheet port 3 19 address summarization PNNI 3 2 administrative weight See AW AESA 3 14 4 10 AESA embedded E 164 3 4 AINI MGX 8850 support 1 8 planning address prefixes 3 12 SES support 1 8 topology definition 1 8 version 2 1 American National Standards Institute 3 6 ANSI 3 6 APS 2 5 ATM addresses default address 3 10 formats 3 3 ILMI prefix 3 12 plan guidelines 3 13 planning 3 1 regis...

Страница 84: ...ll transfer delay See CTD child peer group 1 5 1 6 Cisco com xxvii Cisco BPX 8600 1 1 Cisco MGX 8850 AINI support 1 8 hierarchical PNNI support 1 4 Cisco MGX 8880 Media Gateway 1 1 Cisco MGX switches 1 1 Cisco Service Expansion Shelf See SES Cisco TAC See TAC Cisco WAN Manager See CWM class of service 4 7 Closed User Group See CUG CLR0 1 route selection parameter 4 7 CLR0 route selection parameter...

Страница 85: ...on address 3 2 destination endpoint connection 3 1 Deutsche Industrie Normen 3 6 Dijkstra SPF algorithm 4 4 DIN 3 6 directed route 4 7 documentation changes for this release xxviii conventions xii descriptions of manuals xxii feedback xxix manuals for each product release xvi objectives xi obtaining xxx ordering xxvii organization xi recommended order of use xiv that ships with products xxii E E 1...

Страница 86: ...nal network 2 6 inside 1 8 metrics 4 1 MGX and SES link selection 4 6 outside 1 8 parallel links 2 5 link state protocol 1 1 load balancing 4 6 parallel links 2 5 route selection option 4 7 logical group node See LGN logical nucleus 1 7 logical spokes 1 7 LOS 1 2 loss of signal 1 2 M MAC address 3 11 manuals See documentation master endpoint connection 3 1 maxCR definition 4 3 route selection para...

Страница 87: ...eaf 4 10 connection party 4 10 connection root 4 10 farthest node branching 4 11 leaf initiated join 4 11 MGX switch specifications 2 3 overview 4 9 parallel links 2 5 party P2MP 4 10 pass through connection blocking 4 9 paths 2 6 peer group ID 3 10 peer group leader See PGL peer groups ID selection 3 10 leaders 1 6 multiple See hierarchical PNNI single 1 2 PGL 1 5 definition 1 6 planning guidelin...

Страница 88: ...ic ATM network PNNI level limitation 3 9 PXM 1 2 Q QoS 4 1 4 6 quality of service See QoS R RCC 1 2 real time variable bit rate See rt VBR redundant hardware 2 5 root 4 10 route CDV 4 2 CTD 4 2 directed 4 7 maxCR 4 3 metrics 4 1 preferred 4 7 route selection 4 1 AvCR 4 7 AW 4 7 best fit 4 6 first fit 4 6 load balancing 4 7 maxCR 4 7 routing on demand 4 6 preferred 4 7 SPT 4 3 routing control chann...

Страница 89: ...tic ATM addresses planning 3 13 T TAC case priority definitions xxx opening a case xxix website xxix technical assistance obtaining xxix Technical Assistance Center See TAC tips symbol defined xii TM 4 0 2 1 topology AINI topology definition 1 8 hierarchical PNNI benefits 1 8 definition 1 3 planning 3 7 IISP topology definition 1 9 MPG See hierarchical PNNI single peer group 1 2 topology database ...

Страница 90: ...Index IN 8 Cisco PNNI Network Planning Guide for MGX and SES Products Release 5 Part Number OL 3847 01 Rev D0 April 2004 ...

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