Configuration Guide User guide

846 FastIron Configuration Guide
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Layer 2 behavior with MCT
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Layer 2 behavior with MCT
This section describes the Layer 2 behavior when MCT is configured.
MAC operations
This section describes MAC address-related configuration operations.
MAC Database Update
The MAC addresses that are learned locally are given the highest priority or the cost of 0 so they
are always selected as the best MAC address.
Each MAC address is advertised with a cost. Low cost MAC addresses are given preference over
high cost addresses.
If a MAC address moves from a CCEP port to a CEP port, a MAC move message is sent to the peer
and the peer moves the MAC address from its CCEP ports to the ICL links.
If the cost of a MAC address is the same, then the address learned from the Lower RBridgeID wins
and is installed in the FDB.
MAC addresses in MCT VLANs are updated across the cluster using MDUP messages.
Cluster MAC types
Cluster Local MAC (CL): MAC addresses that are learned on the MCT VLAN and on CEPs locally.
MAC addresses are synchronized to the cluster peer device and are subject to aging.
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. They are deleted only when it is deleted from the peer. A MDB entry is created for these MAC
addresses with a cost of 1, and 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. A MDB
entry is created for these addresses with a cost of 0 and 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. They are deleted only when it is deleted from the peer. A MDB entry is
created for the MAC addresses with the cost of 1, and are associated with the client and peer
RBridgeIDs.
Cluster Multi-Destination Local MAC (CML): A static MAC entry is configured locally on the MCT
VLAN. Any static MAC address configured on MCT VLAN will have ICL added by default so it will
automatically become a multi-destination MAC entry. The local configuration generates a local
MDB, any CML entry can still have up to 2 MDBs associated with, one local and one remote. The
remote MDB comes with the remote static configuration for the same (MAC, VLAN). If the dynamic
MAC and static configuration co-exist, the dynamic MAC address will be removed whether it is
locally learnt or learned from MDUP. The port list of a CML entry has a ICL port, the client ports from
the client list in the local and remote (if exists) configuration, and all locally configured CEP ports.