Brocade FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide - Manual (Page 174)

Cluster Remote MAC (CR): MAC addresses that are learned via MDUP messages from the peer
device (CL on the peer). The MAC addresses are always programmed on the ICL port and do not age.
The CR is deleted only when the CL is deleted from the peer. An MDB entry is created for these MAC
addresses with a cost of 1 and is associated with the peer RBridgeID.
Cluster Client Local MAC (CCL): MAC addresses that are learned on the MCT VLAN and on
CCEPs.
The MAC addresses are synchronized to the cluster peer device and are subject to aging. An MDB
entry with a cost of 0 is created for these addresses, and they are associated with the client and
cluster RBridgeIDs.
Cluster Client Remote MAC (CCR): MAC addresses that are learned via MDUP message from the
peer device (CCL on the peer). The MAC addresses are always programmed on the corresponding
CCEP port and do not age. The CCR is deleted only when the CCL is deleted from the peer. An MDB
entry with the cost of 1 is created for the MAC addresses, and they are associated with the client and
peer RBridgeIDs.
Cluster Multi-Destination Local MAC (CML): A static MAC entry that is configured locally on the
MCT VLAN. Any static MAC address configured on MCT VLAN will have the ICL added by default.
Consequently, the address automatically becomes a multi-destination MAC entry. The local
configuration generates a local MDB. Any CML entry can still have up to 2 associated MDBs, one local
and one remote. The remote MDB contains the remote static configuration for the same MAC and
VLAN. If the dynamic MAC and static configuration co-exist, the dynamic MAC address is removed,
whether it is learned locally or from MDUP. The port list of a CML entry contains an ICL port, the client
ports from the client list in the local configuration and the remote configuration (if it exists), and all
locally configured CEP ports.
Cluster Multi-Destination Remote MAC (CMR): A static MAC entry that is configured on the MCT
VLAN on the peer side and has no associated local configuration. The CMR entry has only the
information from the remote MDB. The port list of a CMR entry contains an ICL port and all the client
ports from the client list in the remote configuration. When there is a local configuration for the same
entry, the CMR is converted to the CML.
MAC aging
Only the local MAC entries are aged on a cluster device. The remote MAC address entries are aged
based on explicit MDUP messages only.
The remote MAC addresses learned through MDUP messages are dynamic addresses, but they never
age from the FDB.
MAC flush
If the CEP is down, the MAC addresses are flushed, and individual MAC deletion messages are sent
to the peer device.
If the CCEP local port is down, the MAC addresses are flushed locally, and individual MAC deletion
messages are sent to the peer device.
If the clear mac command is given, all the MDB and FDB are rebuilt.
If the clear mac vlan command is given, all the local MDB and FDB are rebuilt for the VLAN.
MAC movement happens normally on the local device.
CEP to CCEP MAC movement - MAC movement happens normally on the local device, and it deletes
all the other MDBs from the peer to create a new local MDB.
Multi-Chassis Trunking
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