Cisco Nexus 5000 Series Switch CLI Software Configuration Guide, NX-OS 4.0(1a)N1 (OL-16597-01, January 2009)

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21-2
Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
OL-16597-01
Chapter 21 Using Cisco Fabric Services
CFS Distribution
– Uncoordinated distributions: Multiple parallel distributions are allowed in the network except
when a coordinated distribution is in progress.
– Unrestricted uncoordinated distributions: Multiple parallel distributions are allowed in the
network in the presence of an existing coordinated distribution. Unrestricted uncoordinated
distributions are allowed to run in parallel with all other types of distributions.
The following features are supported for CFS distribution over IP:
• One scope of distribution over an IP network:
– Physical scope: The distribution spans the entire IP network.
The following features are supported for CFS distribution over Fibre Channel SANs:
• Three scopes of distribution over SAN fabrics.
– Logical scope: The distribution occurs within the scope of a VSAN.
– Physical scope: The distribution spans the entire physical topology.
– Over a selected set of VSANs: Some features require configuration distribution over some
specific VSANs. These features can specify to CFS the set of VSANs over which to restrict the
distribution.
• Supports a merge protocol that facilitates the merge of feature configuration during a fabric merge
event (when two independent SAN fabrics merge).
CFS Distribution
The CFS distribution functionality is independent of the lower layer transport. Cisco Nexus 5000 Series
switches support CFS distribution over IP and CFS distribution over Fibre Channel. Features that use
CFS are unaware of the lower layer transport.
Additional details are provided in the following sections:
• CFS Distribution Modes, page 21-2
• Enabling/Disabling CFS Distribution on a Switch, page 21-3
• Verifying CFS Distribution Status, page 21-4
• CFS Distribution over IP, page 21-4
• CFS Distribution over Fibre Channel, page 21-5
• CFS Distribution Scopes, page 21-5
• CFS Merge Support, page 21-6
CFS Distribution Modes
CFS supports three distribution modes to accommodate different feature requirements. Only one mode
is allowed at any given time. CFS distribution modes are described in the following sections:
• Uncoordinated Distribution, page 21-3
• Coordinated Distribution, page 21-3
• Unrestricted Uncoordinated Distributions, page 21-3