Техническая Спецификация для Cisco Cisco Catalyst 4500 Series Supervisor Engine II-Plus
Data Sheet
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Cisco Catalyst 4500 Series Supervisor Engine Ii-Plus Redundancy for Business Resiliency
The Cisco Catalyst 4507R chassis has been designed with optional 1 + 1 redundant supervisor capability using the
Cisco Catalyst 4500 Series Supervisor Engine II-Plus for integrated resiliency. One of these supervisor engines is
designated as the primary (active) and is responsible for normal system operation; the other (secondary) serves as a
standby, monitoring the operation of the primary supervisor.
Stateful Switchover (SSO) offers continuous packet forwarding during supervisor engine switchover. Information is
fully synchronized between supervisors to allow the standby supervisor to immediately take over in subsecond time if
the primary fails. In Service Software Upgrade (ISSU) allows customers to upgrade or downgrade complete Cisco
IOS
®
Software images with minimal to no disruption to the network when using a redundant Cisco Catalyst 4500
Series system with dual supervisors. It enables rapid, nondisruptive software upgrade for new line cards, new power
supplies, new features, or bug fixes. ISSU offers continuous packet forwarding during the supervisor engine
switchover running different Cisco IOS Software versions.
SSO and ISSU dramatically improve the network reliability and availability in a Layer 2 or Layer 3 environment. SSO
and ISSU are essential for business-critical applications such as voice over IP (VoIP) to help ensure that VoIP calls
are not dropped.
When the primary supervisor fails, the secondary supervisor assumes control of the chassis. This algorithm prevents
oscillations between primary and secondary supervisors. Alerts are generated to the network-monitoring software if
either fails. A supervisor switchover can be forced by software, or by the user through the console or with the Simple
Network Management Protocol (SNMP).
Predictable Performance and Scalability
The Cisco Catalyst 4500 Series Supervisor Engine II-Plus delivers a 64-Gbps switching fabric with a 48-million-
packets-per-second (mpps) forwarding rate in hardware for Layer 2–4 traffic. Switching performance is independent
of the number of route entries or advanced Layer 3 and 4 services enabled. The Cisco Catalyst 4500 Series is
optimized for multimedia applications with its advanced multicast support and wire-speed switching in hardware.
Protocol Independent Multicast (PIM) and Source Specific Multicast (SSM) are supported, providing end users with
additional scalability to support multimedia applications.
The Cisco Catalyst 4500 Series Supervisor Engine II-Plus supports Internet Group Management Protocol (IGMP)
snooping in hardware, enhancing the performance of multimedia applications and reducing network traffic by
allowing a switch to dynamically add and remove hosts from a multicast group.
Intelligent Network Services with QoS and Sophisticated Traffic Management
The Cisco Catalyst 4500 Series Supervisor Engine II-Plus offers superior per-port QoS features to help ensure that
network traffic is optimally classified, prioritized, and scheduled to efficiently handle multimedia, time-sensitive
(voice), and mission-critical applications. This supervisor engine can classify, police, and mark incoming packets,
allowing the administrator to differentiate between traffic flows and to enforce policies based on granular QoS fields.
Sharing, shaping, and strict priority configurations determine scheduling of egress traffic. This supervisor engine also
supports Dynamic Buffer Limiting (DBL), a congestion-avoidance feature.
For details about the QoS features (including DBL), refer to the QoS overview at:
http://www.cisco.com/en/US/products/hw/switches/ps4324/prod_white_papers_list.html
.