Brocade FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide - Manual (Page 173)

• If no packets are received from the peer device for a period of three seconds, the peer is considered
down.
• If a keep-alive VLAN is not configured and both the peer devices are up, both peers keep forwarding
traffic independently.
Setting keep-alive timers and hold-time
To specify the keep-alive timers and hold time for the peer devices, enter a command such as the
following.
device-1(config-cluster-SX))# peer 10.1.1.3 timers keep-alive 40 hold-time 120
Syntax: [no] peer peer-ip timers keep-alive keep-alive-time hold-time hold-time
The peer-ip parameter should be in the same subnet as the cluster management interface.
The keep-alive-time variable can be from 0 to 21845 seconds. The default is 10 seconds.
The hold-time variable can be from 3 to 65535 seconds and must be at least 3 times the keep-alive
time. The default is 90 seconds.
NOTE
The keep-alive VLAN and keep-alive timers are not related. The keep-alive timer is used by CCP.
Layer 2 behavior with MCT
This section describes the Layer 2 behavior when MCT is configured.
MAC operations
This section describes configuration operations related to MAC addresses.
MAC Database Update
Each MAC address is advertised with a cost. Low-cost MAC addresses are given preference over high-
cost addresses. MAC addresses that are learned locally are given the highest priority, or the cost of 0,
so that they are always selected as the best MAC address.
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 two MAC addresses have the same cost, 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.
Setting keep-alive timers and hold-time
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