Dica legal do blog log https://ethernuno.wordpress.com/2016/01/08/ccnp-switch-300-115-part-1-8-chassis-virtualization-and-aggregation-technologies/
Dos tópicos de CCNP SWITCH que fala de stackwise, passa algumas maneiras de acelerar o roteamento em caso de switchover.
Switchover is the manual switch from one system to a redundant or standby computer server, system, or network upon the failure or abnormal termination of the previously active server, system, or network, or to perform system maintenance, such as installing patches, and upgrading software or hardware.
chassis-virtualization-and-aggregation-technologies
Dica
Nonstop Forwarding
Nonstop forwarding (NSF) is an interactive method that focuses on quickly rebuilding the Routing Information Base (RIB) table after a supervisor switchover. The RIB is used to generate the FIB table for CEF, which is downloaded to any switch modules or hardware that can perform Cisco Express Forwarding (CEF).
Instead of waiting on any configured Layer 3 routing protocols to converge and rebuild the FIB, a router can use NSF to get assistance from other NSF-aware neighbors. The neighbors then can provide routing information to the standby supervisor, allowing the routing tables to be assembled quickly. In short, the Cisco proprietary NSF functions must be built in to the routing protocols on both the router that will need assistance and
the router that will provide assistance.
NSF is supported by the BGP, EIGRP, OSPF, and IS-IS routing protocols. To configure NSF, you must add the following commands to any routing protocol configuration on the switch.
BGP
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Switch(config)# router bgp as-number Switch(config-router)# bgp graceful-restart |
OSPF
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Switch(config)# router ospf process-id Switch(config-router)# nsf |
EIGRP
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Switch(config)# router eigrp as-number Switch(config-router)# nsf |
IS-IS
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Switch(config)# router isis [tag] Switch(config-router)# nsf [cisco | ietf] Switch(config-router)# nsf interval [minutes] Switch(config-router)# nsf t3 {manual [seconds] | adjacency} Switch(config-router)# nsf interface wait seconds |