Dell N3200-ON EMC Networking N-Series Switches CLI Reference Guide version 6.7 - Page 654

Syntax peer-keepalive enable no peer-keepalive enable Default Configuration The peer keepalive protocol is disabled by default. Command Modes MLAG Domain Configuration mode User Guidelines MLAG will not become operational until the peer keepalive protocol detects a peer and syncs the peer information. Peer keepalive timeout state transitions are suppressed if the Dual Control Plan Detection (DCPDP) is enabled and detects that the peer is still alive. Two failure situations cause state transitions: • The peer device fails: A peer does not receive any more advertisements and the timeout timer expires. • Secondary device fails: All MLAG members' port information regarding the secondary device that the primary switch maintains are removed from the primary switch. Forwarding and control processing continues on the local MLAG ports on the primary switch. Once the secondary comes back up again, it starts the keepalive protocol and, if successful in contacting the primary device, moves to the secondary state. It then initiates an FDB sync and becomes operational again. • Primary device fails: The secondary device transitions to primary state and continues forwarding traffic on its local MLAG ports. It also starts processing control messages. The MLAG connected devices see a change in the source MAC address. Once the peer device comes up again, it starts the keepalive protocol and transitions to the secondary state. • The peer-link fails: This occurs when either switch cannot contact the peer through the peer keepalive protocol and the DCPDP protocol. The secondary switch transitions to a primary role which results in two primary switches. Both primaries continue forwarding traffic. Each primary also Layer 2 Switching Commands 654