Brocade BigIron RX Series Configuration Guide - Manual (Page 605)

BigIron RX Series Configuration Guide 527
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Multi-Chassis Trunking overview
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• Cluster Client RBridge Reachability (CCRR) - The CCRR message is used to exchange
information between the peers.
Dynamic LAGs
MCT client creates a single dynamic LAG towards the MCT nodes. For MCT nodes, the dynamic LAG
consists of two LAGs, each configured on one of the MCT devices. A dynamic LAG runs Link
Aggregation Control Protocol (LACP).
Both the dynamic LAGs of the MCT must have the same LACP system ID and key, referred to as the
MCT system ID and MCT key to behave as a single LAG from the perspective of the MCT client.
The MCT system ID and key is uniquely defined for one MCT and has the following attributes:
• MCT base system ID = 0180.c200.0000
• MCT system ID = MCT base system ID + cluster ID
• Cluster ID = User-configurable on each MCT peer and unique across the MCT system
• MCT base key = 30000
• MCT LAG Group ID = MCT base key + client bridge ID
NOTE
Each MCT node has a unique cluster ID and one MCT client ID.
MCT peers
Each MCT physical nodes, A and B in Figure 92 , acts as an MCT peer, which are connected using an
ICL. A pair of MCT peers acts as a single logical switch with the client connected through a standard
LAG between the peers, as shown in
Figure 92 .
FIGURE 92 MCT peers
Syncing interface MAC addresses to peer MCT devices
The MCT device uses an interface MAC address to identify the packets that are addressed to the
switch. The peer MCT device receives and switches the packets over the ICL to the local MCT switch
for proper routing of the packets.
ICL
LAGs
B A
MCT logical
switch
LAGs