Cisco S45ESK9-12231SG= ユーザーズマニュアル
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Product Bulletin No. 3256
Cisco IOS Software Release 12.2(31)SG for
Cisco
Cisco
Catalyst
4500
Series
Supervisor Engines
This product bulletin describes the hardware and software features supported by Cisco IOS
®
Software Release 12.2(31)SG
for the Cisco
®
Catalyst
®
4500 Series Supervisor Engine II-Plus, II-Plus-TS, II-Plus-10GE, IV, V and V-10GE. The Cisco Catalyst
4500 Series Supervisor Engine III is not supported in this software release.
KEY FEATURE BENEFITS
•
Nonstop Forwarding with Stateful Switchover (NSF/SSO): Ensures continuous packet forwarding in a Layer 3 routing environment during
supervisor engine switchover.
–
Nonstop traffic forwarding, transparent to users, such as voice over IP (VoIP) and mission-critical applications
•
Control Plane Policing (CoPP): Protects the supervisor CPU by rate limiting and filtering out malicious traffic in hardware.
–
Ensures network stability and availability and predictable network performance by controlling the traffic to the supervisor CPU
•
Web Content Communication Protocol (WCCPv2) Layer 2 Redirection: Transparently redirects content requests to directly connected
content engines via a L2/MAC address rewrite.
–
Improves user response time and content availability by serving content locally on the LAN instead of the WAN
•
Network Admission Control (NAC) and 802.1x Enhancements (MAC Authentication Bypass, 802.1x Inaccessible Authentication Bypass,
802.1x Unidirectional Controlled Port): Helps ensure that endpoints comply with security policies to protect networks against worms and viruses.
–
Increases flexibility of NAC and 802.1x deployments
NEW SOFTWARE FEATURES
Nonstop Forwarding with Stateful Switchover
Nonstop forwarding with stateful switchover (NSF/SSO) offers continuous packet forwarding in a Layer 3 routing environment during supervisor
engine switchover. It further extends reliability and availability offered by the Cisco Catalyst 4500’s SSO and NSF-aware to the Layer 3 networks.
During supervisor engine switchover, NSF/SSO continues forwarding data packets along known routes while the routing protocol information is
recovered and validated gracefully, avoiding unnecessary route flaps and network instability. With NSF/SSO, IP phone calls do not drop. NSF/SSO
is supported for Open Shortest Path First (OSPF), Border Gateway Protocol (BGP), Enhanced Interior Gateway Routing Protocol (EIGRP),
Intermediate System–to–Intermediate Systems (IS-IS) Protocol, and Cisco Express Forwarding. NSF/SSO is typically deployed in the most critical
parts of an enterprise or service provider network, such as Layer 3 aggregation/core or a resilient Layer 3 wiring closet design. It is an essential
component of single chassis deployment for mission-critical applications.
SSO-Aware Hot Standby Router Protocol
SSO-aware Hot Standby Router Protocol (HSRP) offers continuous packet forwarding during a supervisor engine switchover without a path change
to the standby HSRP router. During supervisor engine switchover, NSF/SSO continues forwarding data packets along known routes using the HSRP
virtual IP address. When both supervisor engines fail on the active HSRP router, the standby HSRP router takes over as the active HSRP router. It
further extends reliability and availability offered by the Cisco Catalyst 4500’s NSF/SSO to the Layer 3 aggregation with redundant chassis.