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Additional resources for Cisco - Cisco 7100, Cisco 7200 and Cisco 7500 Configuration Guidelines 1108
Favorable factors for over-subscription Low utilization Full-duplex serial links Large number of interfaces • No fixed rules for over-subscription 1108 0987_05F9_c3 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 86 43 Cisco 7500 VIP2 Block Diagram VIP2 Capacity Areas: CyBus CyBus Interface CPU and DRAM Pkt Memory Controller SRAM PCI Bridge PCI Bridge Port Adapter Port Adapter Kpps Packet Bus Primary PCI Bus SRAM Bandwidth Secondary PCI Buses 1108 0987_05F9_c3 87 © 1999, Cisco Systems, Inc.
Mem VIP IP 1108 0987_05F9_c3 VIP VIP © 1999, Cisco Systems, Inc. 67 Cisco 7500 System Bus Bandwidth • Cisco 7507, Cisco 7513, and “half-7576” Dual CyBus 1066 Mbps each, total 2 Gbps • Cisco 7505 Single CyBus at 1066 Mbps • RSP7000 (and Cisco 7000/7010) Single CxBus at 533 Mbps 1108 0987_05F9_c3 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 68 34 Cisco 7500 IP/VIP Classification • Cy mode All VIPs and VIP-based IPs, CIP, FEIP Use CyBus at 1066 Mbps • Cx mode All other IPs Use CyBus at 533 Mbps 1108 0987_05F9_c3 © 1999, Cisco Systems, Inc.
Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 70 35 Cy Mode and Cx Mode Bandwidth Consumption • CyBus bandwidth is 1066 Mbps in Cy mode • Cx mode uses two “Cy clock cycles” per bit • Cx card takes up twice as much CyBus capacity as Cy card 1108 0987_05F9_c3 © 1999, Cisco Systems, Inc. 71 Cisco 7500 Bus Bandwidth • Each VIP/IP requires bandwidth from the bus • Aggregate bandwidth requirement should not exceed bus capacity Over-subscription Bus overhead Interface utilization • Two CyBuses are independent • Balance between the two buses 1108 0987_05F9_c3 © 1999, Cisco Systems, Inc.