Multi-Chassis Link Aggregation Group (MCLAG) is a link aggregation technique where two or more links across two switches are aggregated together to form a trunk.
Creating an MLAG interface:
Create an MLAG interface for the host. Run:
switch (config)# interface mlag-port-channel 1
switch (config interface mlag-port-channel 1)#
The MPO interfaces should be configured in the same sequence on both switches of MLAG cluster.
Example:
On Switch 1:
interface mlag-port-channel 1-10
interface mlag-port-channel 30-40
On Switch 2:
interface mlag-port-channel 1-10
interface mlag-port-channel 30-40
Bind an Ethernet port to the MLAG interface:
switch (config interface ethernet 1/1)# mlag-channel-group 1 mode on
Create and enable the MLAG interface:
switch (config interface mlag-port-channel 1)# no shutdown
Enabling MLAG:
Enable MLAG:
switch (config mlag)# no shutdown
When running MLAG as L2/L3 border point, MAGP VIP must be deployed as the default GW for MPOs.
Verifying MLAG Configuration
Examine MLAG configuration and status. Run show mlag on the switch:
Switch 1 [my-vip: master] (config)# show mlag
Admin status: Enabled
Operational status: Up
Reload-delay: 1 sec
Keepalive-interval: 30 sec
Upgrade-timeout: 60 min
System-mac: 00:00:5e:00:01:5d
MLAG Ports Configuration Summary:
Configured: 1
Disabled: 0
Enabled: 1
MLAG Ports Status Summary:
Inactive: 0
Active-partial: 0
Active-full: 1
MLAG IPLs Summary:
ID Group Vlan Operational Local Peer Up Time Toggle Counter
Port-Channel Interface State IP address IP address
----------------------------------------------------------------------------------------------
1 Po1 1 Up 1.1.1.1 1.1.1.2 0 days 00:00:09 5
Peers state Summary:
System-id State Hostname
-----------------------------------
F4:52:14:2D:9B:88 Up <Switch 1>
F4:52:14:2D:9B:08 Up Switch 2
Examine the MLAG summary table:
Switch 1 [my-vip: master] (config) # show interfaces mlag-port-channel summary
MLAG Port-Channel Flags: D-Down, U-Up, P-Partial UP, S-suspended by MLAG
Port Flags:
D: Down
P: Up in port-channel (members)
S: Suspend in port-channel (members)
I: Individual
MLAG Port-Channel Summary:
------------------------------------------------------------------------------
Group Type Local Peer
Port-Channel Ports Ports
(D/U/P/S) (D/P/S/I) (D/P/S/I)
------------------------------------------------------------------------------
1 Mpo2(U) Static Eth1/2(P) Eth1/2(P)
Examine the MLAG statistics. Run:
Switch 1 [my-vip: master] (config)# show mlag statistics
IPL 1
Rx Heartbeat : 516
Tx Heartbeat : 516
Rx IGMP tunnel : 0
Tx IGMP tunnel : 0
RX XSTP tunnel : 0
TX XSTP tunnel : 0
RX mlag-notification : 0
TX mlag-notification : 0
Rx port-notification : 0
Tx port-notification : 0
Rx FDB sync : 0
Tx FDB sync : 0
RX LACP manager : 1
TX LACP manager : 0
(Optional) In case MLAG-VIP was configured, its functionality can be examined using “show mlag-vip” command.
Switch 1 [my-vip: master] (config)# show mlag-vip
MLAG VIP
========
MLAG group name: my-mlag-group
MLAG VIP address: 10.234.23.254 /24
Active nodes: 2
Hostname VIP-State IP Address
----------------------------------------------------
Switch 1 master 10.234.23.1
Switch 2 standby 10.234.23.2
No output will appear, if MLAG-VIP is not configured.
Expected Results