Brocade FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide - Manual (Page 172)

MCT cluster devices can operate in two modes. Both peer devices should be configured in the same
mode.
Loose mode (default): When the CCP goes down, the peer device performs the master/slave
negotiation. After negotiation, the slave shuts down its peer ports, but the master peer ports continue
to forward traffic if a keep-alive VLAN is configured.
If a keep-alive VLAN is not configured, both peer devices become masters, and both of the client ports
stay up.
device-1(config-cluster-SX)# client-isolation loose
Strict mode: When the CCP goes down, the interfaces on both the cluster devices are
administratively shut down. In this mode, the client is completely isolated from the network if the CCP
is not operational.
device-1(config-cluster-SX)# client-isolation strict
Syntax: [no] client-isolation strict
Shutting down all client interfaces
Use the client-interfaces shutdown command when performing a hitless upgrade operation. This
command can be used to shut down all the local client interfaces in the cluster, which results in
failover of traffic to the peer device.
device-1(config-cluster-SX)# client-interfaces shutdown
Syntax: [no] client-interfaces shutdown
Using the keep-alive VLAN
CCRR messages are used to exchange information between peer devices. When the CCP is up,
CCRR messages are sent over the CCP. When the CCP client cannot be reached or the ICL is down,
you can use the keep-alive-vlan command under the cluster context so CCRR messages are
periodically sent over the keep-alive VLAN. Only one VLAN can be configured as a keep-alive VLAN.
The keep-alive VLAN cannot be a member VLAN of the MCT, and this VLAN can be tagged or
untagged.
NOTE
Keep-alive VLAN configuration is not allowed when the client isolation mode is strict. When a keep-
alive VLAN is configured, client isolation mode cannot be configured as strict.
device-1(config-cluster-SX))# keep-alive-vlan 10
Syntax: [no] keep-alive-vlan vlan-id
The vlan_id variable specifies the VLAN range. Possible values are from 1 to 4089.
When the CCP is down, the following results occur.
• If the keep-alive VLAN is configured, CCRR messages are sent every second over that VLAN.
• When CCP is down and a keep-alive VLAN is configured, master/slave selection is based on the
following criteria:
‐ If one device’s CCEPs are up and the peer’s CCEPs are down, the peer with the local
CCEPs down becomes the slave.
‐ Otherwise, the device with the higher RBridgeID becomes the slave.
Shutting down all client interfaces
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