Nsf With Sso - Cisco Catalyst 4500 Series Software Configuration Manual

Chapter 1 Product Overview
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For information on configuring multicast services, see

NSF with SSO

Non-Stop Forwarding with Stateful Switchover (NSF/SSO) offers continuous data packet forwarding in
a Layer 3 routing environment during supervisor engine switchover. During supervisor engine
switchover, NSF/SSO continues forwarding data packets along known routes while the routing protocol
information is recovered and validated, avoiding unnecessary route flaps and network instability. With
NSF/SSO, IP phone calls do not drop. NSF/SSO is supported for OSPF, BGP, EIGRP, IS-IS, and Cisco
Express Forwarding (CEF). 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 critical applications. NSF/SSO is available
for all shipping supervisor engines on Catalyst 4507R and 4510R chassis with supervisor redundancy.
With the IP Base image, NSF is supported with EIGRP-stub routing and OSPF.
Note
With the Enterprise Services image, NSF is supported on all routing protocols except for RIP.
Note
The LAN Base image does not support NSF.
Note
For information on NSF with SSO, see
Engine Redundancy."
OSPF for Routed Access
OSPF for Routed Access is designed specifically to enable customers to extend Layer 3 routing
capabilities to the access or wiring closet.
Protocol Independent Multicast (PIM)—PIM is protocol-independent because it can leverage
whichever unicast routing protocol is used to populate the unicast routing table, including EIGRP,
OSPF, BGP, or static route. PIM also uses a unicast routing table to perform the Reverse Path
Forwarding (RPF) check function instead of building a completely independent multicast routing
table.
For information on PIM-SSM mapping, see the URL:
http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/15.1SY/config_guide/sup720/ude
_udlr.html
IP Multicast Load Splitting (Equal Cost Multipath (ECMP) Using S, G and Next Hop)—
IP Multicast Load Splitting introduces more flexible support for ECMP multicast load splitting by
adding support for load splitting based on source and group address and on source, group, and
next-hop address. This feature allows multicast traffic from devices that send many streams to
groups or that broadcast many channels, such as IPTV servers or MPEG video servers, to be more
effectively load shared across equal-cost paths.
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 38, "Configuring IP Multicast."
Chapter 13, "Configuring Cisco NSF with SSO Supervisor
Layer 3 Software Features
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