4/23/2021 0 Comments Ip Lag Switch
The peer link carries MLAG advertisements, keepalive messages, and data traffic between the switches.When all devices that connect to the MLAG domain are dually connected to the switches through an MLAG, a peer link of two Ethernet interfaces is sufficient to handle MLAG control data and provide N1 redundancy.When the domain connects to devices through only one MLAG peer, the peer link may require additional Ethernet interfaces to manage data traffic.Disruptions to peer link connectivity due to forwarding agent restarts may cause an extended MLAG outage.
Forwarding agent restart event include some configuration changes, such as port speed change or UFT mode change). The following precautions can reduce the risk of losing peer-link connectivity: all switches: constructing peer-links from port-channels in preference to a single Ethernet interface. The local address is the SVI that maps to the peer link port channel. The port channel and SVI must be configured on each peer switch. The local and peer addresses must be located on the same IP address subnet. ![]() Examples These commands create an active mode LACP port channel interface from two Ethernet interfaces and configure it as part of a trunk group on each switch. The switchport mode trunk command permits all VLANs on the interface by default, so all VLANs are permitted on port channel 10 in the following example. The configuration of a trunk group for a VLAN restricts only that specific VLAN to the associated ports: VLAN 4094 is only permitted on port channel 10, and not on any other ports on the switch. It is important to remember that all VLANs must be permitted between the peers on the peer link for correct operation. The SVI creates a Layer 3 endpoint in the switch and enables MLAG processes to communicate via TCP. The IP address can be any unicast address that does not conflict with other SVIs. STP is disabled for the peer link VLAN 4094 to prevent any potential STP disruption of inter peer communications. Recall that the VLAN has been restricted to port-channel 10 by the earlier trunk group configuration thus preventing potential Layer 2 loop conditions within VLAN 4094. This section describes the following peer configuration parameters. Example This command places the switch in MLAG configuration mode. The local IP address is specified within the definition of the VLAN associated with the local interface. The Peer Address configures the control traffic destination on the peer switch. The. Example This command configures VLAN 4094 as the local interface. If the peer IP address is unreachable, MLAG peering fails and both peer switches revert to their independent state. ![]() Peer Link An MLAG is formed by connecting two switches through an interface called a peer link.
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