Brocade BigIron RX Series Configuration Guide - Manual (Page 653)

BigIron RX Series Configuration Guide 575
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Syslogs and debugging
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When an ICL or CCP goes down, the keepalive VLAN is used to find the cluster nodes
reachability. If the peer node is reachable over the keepalive VLAN, then the MCT nodes
perform the master and slave negotiation for each client. After negotiation, the slave shuts
down its client ports, whereas the master client ports continue to forward the traffic.
The master and slave negotiation is done for each MCT client based on the RBridge ID and the
client reachability. If the client is reachable from both the MCT nodes, the higher RBridge ID
becomes the master. If the client is reachable from one of the MCT nodes, then the node on
which it is reachable becomes the master.
If the peer is not reachable over the keepalive VLAN, then both the cluster nodes forward the
traffic.
NOTE
Brocade recommends using the keepalive VLANs with the MCT configurations because the
configured keepalive VLAN provides a backdoor reachability if an ICL interface goes down.
• An ICL interface or CCP goes down and the keepalive VLAN is not configured.
When the keepalive VLAN is not configured, then both the cluster nodes forward the traffic.
Use the client-isolation strict command to remove the client interface when an ICL goes down,
and isolate the client completely.
• An MCT node goes down.
When the MCT nodes goes down, the traffic fails over to the other MCT node.
• Hitless failover is performed on one of the MCT nodes.
Traffic is switched over to the other node. However, the CCP goes down and will be up again
after the hitless failover is completed.
Use the client-interfaces shutdown command to shut down all the client interfaces so that the
traffic fails over to the other MCT node first, and then perform the hitless failover.
• The client interface on one of the MCT nodes goes down.
When hitless failover is performed on an MCT node, then the node flushes all the MAC entries
and re-establishes the cluster CCP session.
• The ICL and client interfaces go down on one MCT node (double failures).
Multiple failures drop traffic in this scenario, even if the actual physical path is available.
Syslogs and debugging
Syslogs are displayed when the remote CCEP state is changed or the remote client is deployed or
undeployed. The following example is from the syslog.
SYSLOG: Jun 1 15:43:36:<14>Jun 1 15:43:36 CES, CLUSTER FSM: Cluster mct (Id: 1),
client c2 (RBridge Id: 4) -
Remote client deployed
SYSLOG: Jun 1 16:04:24:<14>Jun 1 16:04:24 CES, CLUSTER FSM: Cluster mct (Id: 1),
client c2 (RBridge Id: 4) -
Remote client CCEP up