Cisco 2975 - Catalyst LAN Base Switch Manual de usuario Pagina 20

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© 2007 Cisco Systems, Inc. All rights reserved. Cisco Confidential
20
Software Architecture: Cisco IOS XE
Cisco IOS XE = IOS + Middleware
+ Platform software
Operational consistency—same
look and feel as Cisco IOS Router
Cisco IOS runs as a Linux process
for control plane (Routing, SNMP,
CLI etc). 32bit and 64bit options
Linux kernel with multiple
processes running in
protected memory for
–Fault containment
–Re-startability
–ISSU of individual SW packages
ASR HA Innovations
–Zero-packet-loss RP failover
–<50ms ESP failover
–Software redundancy
Embedded Services
Processor
Route Processor
SPA Carrier Card
Kernel Kernel
Kernel
QFP
Chassis
Manager
Interface
Manager
Forwarding
Manager
SPA
Driver
SPA
Driver
SPA
Driver
SPA
Driver
Cisco
IOS
12.2SR
(Standby)
Forwarding
Manager
Chassis
Manager
Cisco
IOS
12.2SR
(Active)
Cisco IOS XE “Middleware”
Interface
Interface
Manager
Manager
Chassis
Chassis
Manager
Manager
Control Messaging
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