80
(QCT) #config
(QCT) (Config)#mlag
3. Create the MLAG domain ID. The domain ID configured on both the MLAG peer switches should be same.
In a two-tier MLAG topology, each pair should have different domain ID.
(QCT) (Config)#mlag domain 1
4. Configure the MLAG system MAC address and/or MLAG system priority (optional).
(QCT) (Config)#mlag system-mac C4:54:44:01:01:01
5. Enable the keepalive protocol.
(QCT) (Config)#mlag peer-keepalive enable
6. Configure the MLAG role priority (optional).
(QCT) (Config)#mlag role priority 10
7. Create Port-channel 1.
(QCT) (Config)#interface port-channel 1
(QCT) (if-port-channel ch1)#description "MLAG-Peer-Link"
8. Allow the Port-channel to participate in all VLANs and accept and send tagged frames only. This is similar
to configuring a port in trunk mode.
(QCT) (if-port-channel ch1)#switchport allowed vlan add tagged 1-99
(QCT) (if-port-channel ch1)#switchport acceptable-frame-types tagged
(QCT) (if-port-channel ch1)#mlag peer-link
(QCT) (if-port-channel ch1)#exit
9. Create the peer link.
(QCT) (Config)#interface range 0/1-0/2
(QCT) (Interface 0/1-0/2)#channel-group 1 mode active
(QCT) (Interface 0/1-0/2)#description "MLAG-Peer-Link"
10. Enable UDLD (if required).
(QCT) (Interface 0/1-0/2)#udld enable
(QCT) (Interface 0/1-0/2)#udld port aggressive
(QCT) (Interface 0/1-0/2)#exit
11. Configure Dual Control Plane detection Protocol Configuration (if required):
a. Configure a VLAN routing interface and assign a local IP address (independent form the peer address).
(QCT) (Config)#interface vlan
100
b. Configure the peer-switch IP address (the destination IP address). This command configures the IP
address of the peer MLAG switch. This configuration is used by the dual control plane detection protocol
(DCPDP) on the MLAG switches. The UDP port on which the MLAG switch listens to the DCPDP messages can
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