Resumen del contenido incluido en la página 1
CHAPTER 4
Trunk Cards
This chapter describes the hardware and functionality of IGX trunk cards. The description of each
card includes:
• Function
• System interconnect
• Faceplate indicators
Other publications that relate to IGX operation are:
• The Cisco IGX 8400 Series Installation and Configuration publication describes installation,
troubleshooting, user commands, repair and replacement, and the rack-mount Cisco IGX
8420-to-IGX 8430 conversion.
• The Cisco WAN Switching Command Reference publ
Resumen del contenido incluido en la página 2
Trunk Interface Cards Trunk Interface Cards This section describes the IGX trunks. The card groups are: • Universal switching module enhanced (UXM-E) • Network trunk module (NTM) Note With Release 9.2 and later software, an Cisco IGX 8420 or 8430 switch can support a maximum of 32 trunks. Table 4-1 lists the trunk front cards, and Table 4-2 lists the corresponding trunk interface back cards. Table 4-1 Trunk Front Cards Card Acronym Card Name UXM-E Universal switching module NTM Network trunk mod
Resumen del contenido incluido en la página 3
Common Alarms, Controls, and Indicators Trunk Operating Modes IGX trunk cards operate in either simple gateway or cell forwarding mode. Simple gateway supports service interworking, which lets Frame Relay connections terminate at ATM endpoints. For a description of simple and complex gateways, service and network interworking, tiered networks, trunks, ATM protocols, and cell and header formats, refer to the Cisco Systems Overview. Trunk Card Maintenance Trunk cards require no maintenance except
Resumen del contenido incluido en la página 4
Universal Switching Module Enhanced Universal Switching Module Enhanced This description of the universal switching module (UXM-E) covers the following topics: • An introduction includes sections on the UXM-E mode of operation, trunk-mode features, interface card list, card redundancy, card mismatch, clock sourcing, cellbus bandwidth usage, configuration for public ATM network service, and configuration for cell trunk-only routes • Supported traffic and connection types • Inverse multiplexing over
Resumen del contenido incluido en la página 5
Universal Switching Module Enhanced Determining the UXM-E’s Mode of Operation The UXM-E detects reports its mode of operation to switch software when you first activate either a trunk to the network or a line on the UNI or NNI. If you activate a trunk, the UXM-E goes into trunk mode. If you activate a line, the UXM-E goes into port mode. The CLI commands for these operations are uptrk and upln, respectively. (The UXM-E description in this chapter lists important information about the commands tha
Resumen del contenido incluido en la página 6
Universal Switching Module Enhanced voice connection between a CVM and CDP. Connection E is a local connection (DAXCON) between a UFM and a UXM-E UNI port on the same node. For connections C–E, the gateway function of the UXM-E packs and unpacks the FastPackets into and out of the ATM cells. Figure 4-2 UXM-Es in a Network with Heterogeneous Traffic A A UXM-E UXM-E BXM BXM B IGX BPX C B UXM-E UXM-E UXM-E UXM-E UXM-E UFM E IGX IGX IGX NTM UXM-E CVM D E UXM-E Trunk Features The following list broadl
Resumen del contenido incluido en la página 7
Universal Switching Module Enhanced • The maximum throughput is 310 Mbps—two times the OC-3 (STM1) rate. This maximum applies whether the back card is a 2-port or 4-port back card. In practical application, this maximum rate means that most trunk applications with an OC-3 interface would use the 2-port back card. • The UXM-E supports ATM-to-Frame Relay network and service interworking. • For the ABR connection types, the UXM-E supports EFCI marking, Explicit Rate Stamping, and Virtual Source/Vir
Resumen del contenido incluido en la página 8
Universal Switching Module Enhanced Figure 4-3 UXM-E Front Card Minor Major Fail Active Standby UXME 4-8 Cisco IGX 8400 Series Reference 29424
Resumen del contenido incluido en la página 9
Universal Switching Module Enhanced Table 4-5 UXM-E Status LEDs Fail Active Standby Status of Card On Off Off Failed Blinking Blinking Off Back Card Mismatch (hot standby) Blinking On Off Back Card Mismatch (active)—can be missing back card Blinking Off Blinking Back Card Mismatch (self-test) Blinking Off On Back Card Mismatch (standby) Off Blinking Off Hot Standby Off On Off Active Off Off Blinking Self-test Off Off On Standby On On On Down Maximum Number of UXM-Es Switch software limits the nu
Resumen del contenido incluido en la página 10
Universal Switching Module Enhanced Card Mismatch The UXM-E supports two types of card mismatch notification. The notification common to all cards occurs when you connect an unsupported back card to the front card. The mismatch notification unique to the UXM-E occurs if you attach a supported back card but one that has a different interface or a smaller number of the correct line types than what the UXM-E previously reported to software. The UXM-E informs switch software of the number and type of i
Resumen del contenido incluido en la página 11
Universal Switching Module Enhanced The card-based default and maximum cellbus bandwidth for each interface appears in Table 4-5. Note that FastPackets require substantially less cellbus bandwidth than ATM cells. The FastPacket requirements in the figure and table reflect the restriction of FastPackets to one lane and the maximum processing rate of the gateway on the UXM-E. The values you can view with the cnfbusbw and dspbusbw commands are: • Minimum Required Bandwidth, the necessary bandwidth th
Resumen del contenido incluido en la página 12
Universal Switching Module Enhanced Calculating Cellbus Bandwidth Changes To determine how many UBUs are necessary, use the values for average bandwidth used in the following formula: fps ------- - + cps 2 UBUs = ---------------------- - 4000 In most circumstances, the fps and cps values from average bandwidth used are sufficient. The peak bandwidth used values are primarily informational. The information in Table 4-5 provides the ranges for the interface type. Note that, if you do the math accor
Resumen del contenido incluido en la página 13
Universal Switching Module Enhanced • 8.3 and 9.3 • 9.4 and the public network Step 2 Configure trunk 8.1, 8.2, and 8.3 to use VPC 101, 102, and 103, respectively. Step 3 Add 3 VPC connections from 9.1, 9.2, and 9.3 to 9.4. At the far end, use the same VPCs. Routing over Cell Trunks Only You can specify trunk cell routing only as an option when you add a connection between UXM-E, ASI, or BXM ports. When you enable trunk cell routing, switch software routes across only the cell-based trunk cards B
Resumen del contenido incluido en la página 14
Universal Switching Module Enhanced Types of Connections on a UXM-E Trunk This section introduces the connections that a UXM-E trunk supports. The context of each description is the trunk rather than the connection endpoints. The purpose of these descriptions is not only to inform but also help you plan the network. Some definitions overlap because a connection may qualify as more than one type. • A Cell connection carries information that exists in ATM cell format throughout the path. On a UXM-E
Resumen del contenido incluido en la página 15
Universal Switching Module Enhanced IMA characteristics are as follows: • All physical ports of an IMA trunk use the same line configuration. • The node maintains a set of retained links for the IMA trunk to keep it active. The IMA trunk does not fail unless the number of active trunks is less than the user-specified number of retained links. • The IMA trunk can provide a clock source or clock path (see cnftrk command). The first (the lowest numbered) available physical line is used. If this line f
Resumen del contenido incluido en la página 16
Universal Switching Module Enhanced Adding and Removing IMA Group Links When you configure an IMA trunk through Cisco WAN Manager or the cnftrk command, you enter the number of retained links. This represents the number of ports that must remain active for the IMA trunk itself to remain active. If a physical line goes out of service, but the number of active lines is at least as great as the retained links value, the IMA trunk remains active even though the node goes into major alarm. Also, the a
Resumen del contenido incluido en la página 17
Universal Switching Module Enhanced Figure 4-7 shows an example of IMA protocol overhead. In the example, DS0 1 is reserved for an IMA group with 1 to 4 physical lines and DS0 2 is reserved for an IMA group with 5 to 8 physical lines. Figure 4-7 IMA Protocol 5 1 IGX-hub IGX-feeder 6 1 6 1 6 2 U U U U X X X X 3 M- M- M- M- 4 E E E E Trunk 8.1-4 Supported Segment Connections on the IGX Feeder Node Figure 4-8 shows an example of configuring a two-segment connection for IGX feeder node functionality.
Resumen del contenido incluido en la página 18
Universal Switching Module Enhanced VCC Routing Feeder Connection or Cell Endpoint A Endpoint B Type VPC Gateway Type Routing Load Type BXM ATFST GW_TYPE_NWI N/A BDATB_LOAD UXM-E UFM ATFR N/A GW_TYPE_NWI N/A BDATA_LOAD FRM ATFST N/A GW_TYPE_NWI N/A BDATB_LOAD UFM UFM ATFR N/A GW_TYPE_NWI N/A BDATA_LOAD ATFST N/A GW_TYPE_NWI N/A BDATB_LOAD ATFX N/A GW_TYPE_SIWX N/A BDATA_LOAD ATFXFST N/A GW_TYPE_SIWX N/A BDATB_LOAD ATFT N/A GW_TYPE_SIWT N/A BDATA_LOAD ATFTFST N/A GW_TYPE_SIWT N/A BDATB_LOAD FRM F
Resumen del contenido incluido en la página 19
Universal Switching Module Enhanced VCC Feeder Feeder Connection or Cell Endpoint A Endpoint B Type VPC Gateway Type Routing Load Type ABR.STD GW_TYPE_NONE True ABR_LOAD UBR GW_TYPE_NONE True UBR_LOAD UXM-E UXM-E ATFR Both GW_TYPE_NWI N/A BDATA_LOAD UFM UFM ATFST GW_TYPE_NWI N/A BDATB_LOAD ATFX GW_TYPE_SIWX N/A BDATA_LOAD ATFXST GW_TYPE_SIWX N/A BDATB_LOAD ATFT GW_TYPE_SIWT N/A BDATA_LOAD ATFTST GW_TYPE_SIWT N/A BDATB_LOAD UXM-E UXM-E ATFR N/A GW_TYPE_NWI N/A BDATA_LOAD FRM FRM ATFST N/A GW_TYPE
Resumen del contenido incluido en la página 20
Universal Switching Module Enhanced T1 • HCS masking (on or off) • Payload scramble (on or off) • Loop clock (enable/disable) • Line framing (ESF or D4) • Cable length (0 to 655 feet, ABAM cable only) • Idle code • Line coding (fixed as B8ZS) E1 • HCS masking (on or off) • Payload scramble (on or off) • Line DS0 map (timeslots 0 to 31 for unframed or 1 to 15 and 17 to 31 for framed format) • Loop clock • Idle code • Line coding (fixed as HDB3) • Receive line impedance (BNC fixed at 75 ohms; DB-15 fi
