By Hutton, Keith
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Additional info for Authorized self-study guide: designing Cisco network service architectures (ARCH)
Rapid root port failover occurs as part of the default MST protocol implementation. Recommended Practices for Trunk Configuration A trunk is a point-to-point link between two networking devices that carry the traffic of multiple VLANs. Trunks are typically deployed on the interconnection between the access and distribution layers. 1Q trunks. 1Q nontagged, native VLAN. The native VLAN is assigned to an unused ID, or the tagged, native VLAN option is used to avoid VLAN hopping. 1Q-encapsulated packet.
Cisco IOS Software Modularity Architecture When Cisco IOS Software patches are needed on systems without Cisco IOS Software Modularity, the new image must be loaded on the active and redundant supervisors, and the supervisor must be reloaded or the switchover to the standby completed to load the patch. The control plane functions (that manage routing protocol updates and management traffic) on the Catalyst 6500 series run on dedicated CPUs on the multilayer switch forwarding card complex (MSFC).
A completely separate data plane is responsible for traffic forwarding. When the hardware is programmed for nonstop operation, the data plane continues forwarding traffic even if there is a disruption in the control plane. The Catalyst 6500 series switches benefit from the more resilient control plane offered by Cisco IOS Software Modularity. Note Catalyst switch forwarding fabrics are broken down into three planes or functional areas, as follows: • • • Control plane: The control plane is a logical interface that connects physical chassis components and software functions into a unified logical unit.