Cfs Distribution; Cfs Distribution Modes; Uncoordinated Distribution - Cisco AP775A - Nexus Converged Network Switch 5010 Configuration Manual

CFS Distribution

The following features are supported for CFS distribution over IP:
• One scope of distribution over an IP network:
The following features are supported for CFS distribution over Fibre Channel SANs:
• Three scopes of distribution over SAN fabrics.
• Supports a merge protocol that facilitates the merge of feature configuration during a fabric merge event
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.

CFS Distribution Modes

CFS supports three distribution modes to accommodate different feature requirements:

• Uncoordinated Distribution

• Coordinated Distribution
• Unrestricted Uncoordinated Distributions
Only one mode is allowed at any given time.
Uncoordinated Distribution
Uncoordinated distributions are used to distribute information that is not expected to conflict with that from
a peer. Parallel uncoordinated distributions are allowed for a feature.
Coordinated Distribution
Coordinated distributions allow only one feature distribution at a given time. CFS uses locks to enforce this.
A coordinated distribution is not allowed to start if locks are taken for the feature anywhere in the network.
A coordinated distribution consists of three stages:
• A network lock is acquired.
• The configuration is distributed and committed.
• The network lock is released.
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◦ 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.
◦ Physical scope: The distribution spans the entire IP network.
◦ 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.
(when two independent SAN fabrics merge).
Using Cisco Fabric Services
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