System Management
Basic System Configuration Guide 439
Context config>redundancy>multi-chassis>peer
Description This command enables the context to configure synchronization parameters.
sub-mgmt
Syntax [no] sub-mgmt
Context config>redundancy>multi-chassis>peer>sync
Description This command specifies whether subscriber management information should be synchronized with the
multi-chassis peer. This command applies to the 7450 ESS and 7750 SR.
Default no sub-mgmt
sub-host-trk
Syntax [no] sub-host-trk
Context config>redundancy>multi-chassis>peer>sync
Description This command specifies whether subscriber host tracking information should be synchronized with the
multi-chassis peer. This command applies to the 7450 ESS and 7750 SR.
Default no sub-mgmt
warm-standby
Syntax warm-standby
Context configure>redundancy>multi-chassis>peer
Description This command enables Oversubscribed Multi-Chassis Redundancy (OMCR). Subscriber hosts are
synchronized between two chassis only in the control plane and are kept there (as part of the Multi-
Chassis Synchronization (MCS) state) until the switchover occurs. Link or nodal failure will trigger
the switchover at which point the subscriber hosts are being fully instantiated in the control and the
forwarding plane. This approach allows oversubscription of the resources in the central standby (or
protecting) node that is backing-up a number of other active nodes. The total number of protected
subscribers in the OMCR cluster exceeds the forwarding capacity of the protecting node. This is
achievable by not fully occupying the resources for the subscriber hosts until the failure occurs.
The restoration times depend on the amount of the subscriber hosts that are affected by the switchover
and it is related to the time needed for the full instantiation of the subscribers in the forwarding plane.
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