Networking Requirements

Figure 1. User Configuration Topology of MLAG with VRRP

When an MLAG is configured to provide L3 routing functions to downstream clients, the MLAG peers should provide the same gateway address to the downstream clients. VRRP groups combine the MLAG peer devices into a virtual router and use the IP address of the VRRP virtual router to communicate with the access devices as the default gateway address. When one device in the VRRP group fails, VRRP mechanism can elect a new gateway to transmit service traffic thus ensuring the reliable operation of the layer-3 network.

Basic Deployment

In Figure 1, a two-layer MLAG is deployed in the topology, where Switch1 and Switch2 form an MLAG peer at aggregation layer, Switch3 and Switch4 form an MLAG peer at access layer. Switch1and Switch2 are in MLAG domain 1; Switch3 and Switch4 are in MLAG domain 2. It is mandatory that different pairs of MLAG peer devices should use different domain IDs.
In the two-layer MLAG topology, MLAG member ports on the MLAG peer in the same domain MUST belong to the same MLAG, that is, the member ports should be configured with the same link ID. Use link ID 1 on Switch1 and Switch2 to bind all the MLAG member ports, link ID 2 is used on Switch3 and Switch4.
Active-Active VRRP is deployed on Switch1 and Switch2 as Gateway for Host devices of VLAN 20.
Access Switch5 dual-accesses to the network through Switch3 and Switch4 by LAG interface.

Networking Address Planning

The networking IP address planning is shown in the following table.

Switch	Physical Interface	Aggregate Interface	VLAN Interface and IP Address
Switch1	Te-1/1/2	ae3	VLAN interface 4092: 192.168.45.2
	Te-1/1/3	ae3	VLAN interface 4092: 192.168.45.2
	Te-1/1/4	ae1	VLAN interface 20: 11.251.201.1 VRRP virtual IP: 11.251.201.3
	Te-1/1/6	ae1
Switch2	Te-1/1/2	ae3	VLAN interface 4092: 192.168.45.1
	Te-1/1/3	ae3	VLAN interface 4092: 192.168.45.1
	Te-1/1/4	ae1	VLAN interface 20: 11.251.201.2 VRRP virtual IP: 11.251.201.3
	Te-1/1/6	ae1
Switch3	Te-1/1/2	ae4	VLAN interface 4093: 192.168.46.2
	Te-1/1/6	ae4	VLAN interface 4093: 192.168.46.2
	Te-1/1/1	ae1	-
	Te-1/1/3	ae1	-
	Te-1/1/5	ae6	-
Switch4	Te-1/1/2	ae4	VLAN interface 4093: 192.168.46.1
	Te-1/1/6	ae4	VLAN interface 4093: 192.168.46.1
	Te-1/1/4	ae1	-
	Te-1/1/7	ae1	-
	Te-1/1/5	ae6	-
Switch5	Ge-1/1/1	ae6	-
Switch5	Ge-1/1/2	ae6	-

Procedure

Switch1

Step1 Configure the aggregation interface with LACP mode.

admin@Switch1# set interface aggregate-ethernet ae1 aggregated-ether-options lacp enable true

Step2 Configure the VLANs.

admin@Switch1# set vlans vlan-id 10-19
admin@Switch1# set vlans vlan-id 20 l3-interface 20
admin@Switch1# set vlans vlan-id 4088 l3-interface 4088
admin@Switch1# set interface aggregate-ethernet ae1 family ethernet-switching native-vlan-id 10
admin@Switch1# set interface aggregate-ethernet ae1 family ethernet-switching port-mode trunk
admin@Switch1# set interface aggregate-ethernet ae1 family ethernet-switching vlan members 10-19
admin@Switch1# set interface aggregate-ethernet ae1 family ethernet-switching vlan members 20
admin@Switch1# set interface aggregate-ethernet ae3 family ethernet-switching native-vlan-id 4088
admin@Switch1# set interface aggregate-ethernet ae3 family ethernet-switching port-mode trunk
admin@Switch1# set interface aggregate-ethernet ae3 family ethernet-switching vlan members 10-19
admin@Switch1# set interface aggregate-ethernet ae3 family ethernet-switching vlan members 20

Step3 Configure the L3 interface IP address.

admin@Switch1# set l3-interface vlan-interface 4088 address 192.168.45.2 prefix-length 24
admin@Switch1# set l3-interface vlan-interface 20 address 11.251.201.1 prefix-length 24

Step4 Add interfaces to the LAG port.

admin@Switch1# set interface gigabit-ethernet te-1/1/2 ether-options 802.3ad ae3
admin@Switch1# set interface gigabit-ethernet te-1/1/3 ether-options 802.3ad ae3
admin@Switch1# set interface gigabit-ethernet te-1/1/4 ether-options 802.3ad ae1
admin@Switch1# set interface gigabit-ethernet te-1/1/6 ether-options 802.3ad ae1

Step5 Configure MLAG domain ID.

admin@Switch1# set protocols mlag domain 1

Step6 Specify Switch1 as Node 0 of MLAG domain 1.

admin@Switch1# set protocols mlag domain 1 node 0

Step7 Configure link ID on the MLAG member port.

admin@Switch1# set protocols mlag domain 1 interface ae1 link 1

NOTE: The paired MLAG member ports must be bound to the same MLAG link ID.

Step8 Configure the peer IP address and the peer-link for the MLAG peer.

admin@Switch1# set protocols mlag domain 1 peer-ip 192.168.45.1 peer-link ae3

Step9 Configure MLAG peer VLAN.

admin@Switch1# set protocols mlag domain 1 peer-ip 192.168.45.1 peer-vlan 4088

Step10 Enable Active-Active-VRRP function.

 admin@Switch1# set protocols vrrp interface 20 vrid 20 ip 11.251.201.3
 admin@Switch1# set protocols vrrp interface 20 vrid 20 load-balance disable false

Step11 Commit the configuration.

 admin@Switch1# commit

Switch2

Step1 Configure the aggregation interface with LACP mode.

admin@Switch2# set interface aggregate-ethernet ae1 aggregated-ether-options lacp enable true

Step2 Configure the VLANs.

admin@Switch2# set vlans vlan-id 10-19
admin@Switch2# set vlans vlan-id 20 l3-interface 20
admin@Switch2# set vlans vlan-id 4088 l3-interface 4088
admin@Switch2# set interface aggregate-ethernet ae1 family ethernet-switching native-vlan-id 10
admin@Switch2# set interface aggregate-ethernet ae1 family ethernet-switching port-mode trunk
admin@Switch2# set interface aggregate-ethernet ae1 family ethernet-switching vlan members 10-19
admin@Switch2# set interface aggregate-ethernet ae1 family ethernet-switching vlan members 20
admin@Switch2# set interface aggregate-ethernet ae3 family ethernet-switching native-vlan-id 4088
admin@Switch2# set interface aggregate-ethernet ae3 family ethernet-switching port-mode trunk
admin@Switch2# set interface aggregate-ethernet ae3 family ethernet-switching vlan members 10-19
admin@Switch2# set interface aggregate-ethernet ae3 family ethernet-switching vlan members 20

Step3 Configure the L3 interface IP address.

admin@Switch2# set l3-interface vlan-interface 4088 address 192.168.45.2 prefix-length 24
admin@Switch2# set l3-interface vlan-interface 20 address 11.251.201.1 prefix-length 24

Step4 Add interfaces to the LAG port.

admin@Switch2# set interface gigabit-ethernet te-1/1/2 ether-options 802.3ad ae3
admin@Switch2# set interface gigabit-ethernet te-1/1/3 ether-options 802.3ad ae3
admin@Switch2# set interface gigabit-ethernet te-1/1/4 ether-options 802.3ad ae1
admin@Switch2# set interface gigabit-ethernet te-1/1/6 ether-options 802.3ad ae1

Step5 Configure MLAG domain ID.

admin@Switch2# set protocols mlag domain 1

Step6 Specify Switch2 as Node 1 of MLAG domain 1.

admin@Switch2# set protocols mlag domain 1 node 1

Step7 Configure link ID on the MLAG member port.

admin@Switch2# set protocols mlag domain 1 interface ae1 link 1

NOTE: The paired MLAG member ports must be bound to the same MLAG link ID.

Step8 Configure the peer IP address and the peer-link for the MLAG peer.

admin@Switch2# set protocols mlag domain 1 peer-ip 192.168.45.2 peer-link ae3

Step9 Configure MLAG peer VLAN.

admin@Switch2# set protocols mlag domain 1 peer-ip 192.168.45.2 peer-vlan 4088

Step10 Enable Active-Active-VRRP function.

 admin@Switch2# set protocols vrrp interface 20 vrid 20 ip 11.251.201.3
 admin@Switch2# set protocols vrrp interface 20 vrid 20 load-balance disable false

Step11 Commit the configuration.

 admin@Switch2# commit

Switch3

Step1 Configure the aggregation interfaces with LACP mode.

admin@Switch3# set interface aggregate-ethernet ae1 aggregated-ether-options lacp enable true
admin@Switch3# set interface aggregate-ethernet ae6 aggregated-ether-options lacp enable true

Step2 Configure the VLANs.

admin@Switch3# set vlans vlan-id 10-20
admin@Switch3# set vlans vlan-id 4088 l3-interface 4088
admin@Switch3# set interface aggregate-ethernet ae1 family ethernet-switching native-vlan-id 10
admin@Switch3# set interface aggregate-ethernet ae1 family ethernet-switching port-mode trunk
admin@Switch3# set interface aggregate-ethernet ae1 family ethernet-switching vlan members 10-20
admin@Switch3# set interface aggregate-ethernet ae4 family ethernet-switching native-vlan-id 4088
admin@Switch3# set interface aggregate-ethernet ae4 family ethernet-switching port-mode trunk
admin@Switch3# set interface aggregate-ethernet ae4 family ethernet-switching vlan members 10-20
admin@Switch3# set interface aggregate-ethernet ae6 family ethernet-switching native-vlan-id 10
admin@Switch3# set interface aggregate-ethernet ae6 family ethernet-switching port-mode trunk
admin@Switch3# set interface aggregate-ethernet ae6 family ethernet-switching vlan members 10-20

Step3 Configure the L3 interface IP address.

admin@Switch3# set l3-interface vlan-interface 4088 address 192.168.46.2 prefix-length 24

Step4 Configure MLAG domain ID.

admin@Switch3# set protocols mlag domain 2

Step5 Specify Switch3 as Node 0 of MLAG domain 2.

admin@Switch3# set protocols mlag domain 2 node 0

Step6 Configure link ID on the MLAG member port.

admin@Switch3# set protocols mlag domain 2 interface ae1 link 2

NOTE: The paired MLAG member ports must be bound to the same MLAG link ID.

Step7 Add member interfaces to the LAG ports.

 admin@Switch3# set interface gigabit-ethernet te-1/1/2 ether-options 802.3ad ae4
 admin@Switch3# set interface gigabit-ethernet te-1/1/6 ether-options 802.3ad ae4
 admin@Switch3# set interface gigabit-ethernet te-1/1/1 ether-options 802.3ad ae1
 admin@Switch3# set interface gigabit-ethernet te-1/1/3 ether-options 802.3ad ae1
 admin@Switch3# set interface gigabit-ethernet te-1/1/5 ether-options 802.3ad ae6

Step8 Configure the peer IP address and the peer-link for the MLAG peer.

admin@Switch3# set protocols mlag domain 2 peer-ip 192.168.46.1 peer-link ae4

Step9 Configure MLAG peer VLAN.

admin@Switch3# set protocols mlag domain 2 peer-ip 192.168.46.1 peer-vlan 4088

Step10 Commit the configuration.

admin@Switch3# commit

Switch4

Step1 Configure the aggregation interfaces with LACP mode.

admin@Switch4# set interface aggregate-ethernet ae1 aggregated-ether-options lacp enable true
admin@Switch4# set interface aggregate-ethernet ae6 aggregated-ether-options lacp enable true

Step2 Configure the VLANs.

admin@Switch4# set vlans vlan-id 10-20
admin@Switch4# set vlans vlan-id 4088 l3-interface 4088
admin@Switch4# set interface aggregate-ethernet ae1 family ethernet-switching native-vlan-id 10
admin@Switch4# set interface aggregate-ethernet ae1 family ethernet-switching port-mode trunk
admin@Switch4# set interface aggregate-ethernet ae1 family ethernet-switching vlan members 10-20
admin@Switch4# set interface aggregate-ethernet ae4 family ethernet-switching native-vlan-id 4088
admin@Switch4# set interface aggregate-ethernet ae4 family ethernet-switching port-mode trunk
admin@Switch4# set interface aggregate-ethernet ae4 family ethernet-switching vlan members 10-20
admin@Switch4# set interface aggregate-ethernet ae6 family ethernet-switching native-vlan-id 10
admin@Switch4# set interface aggregate-ethernet ae6 family ethernet-switching port-mode trunk
admin@Switch4# set interface aggregate-ethernet ae6 family ethernet-switching vlan members 10-20

Step3 Configure the L3 interface IP address.

admin@Switch4# set l3-interface vlan-interface 4088 address 192.168.46.1 prefix-length 24

Step4 Configure MLAG domain ID.

admin@Switch4# set protocols mlag domain 2

Step5 Specify Switch4 as Node 1 of MLAG domain 2.

admin@Switch4# set protocols mlag domain 2 node 1

Step6 Configure link ID on the MLAG member port.

admin@Switch4# set protocols mlag domain 2 interface ae1 link 2

NOTE: The paired MLAG member ports must be bound to the same MLAG link ID.

Step7 Add member interfaces to the LAG ports.

 admin@Switch4# set interface gigabit-ethernet te-1/1/2 ether-options 802.3ad ae4
 admin@Switch4# set interface gigabit-ethernet te-1/1/6 ether-options 802.3ad ae4
 admin@Switch4# set interface gigabit-ethernet te-1/1/1 ether-options 802.3ad ae1
 admin@Switch4# set interface gigabit-ethernet te-1/1/3 ether-options 802.3ad ae1
 admin@Switch4# set interface gigabit-ethernet te-1/1/5 ether-options 802.3ad ae6

Step8 Configure the peer IP address and the peer-link for the MLAG peer.

admin@Switch4# set protocols mlag domain 2 peer-ip 192.168.46.2 peer-link ae4

Step9 Configure MLAG peer VLAN.

admin@Switch4# set protocols mlag domain 2 peer-ip 192.168.46.2 peer-vlan 4088

Step10 Commit the configuration.

admin@Switch4# commit

Switch5

Step1 Enable the aggregation interface with LACP mode.

admin@Switch5# set interface aggregate-ethernet ae6 aggregated-ether-options lacp enable true

Step2 Add the interfaces to the LAG ports.

admin@Switch5# set interface gigabit-ethernet ge-1/1/1 ether-options 802.3ad ae6
admin@Switch5# set interface gigabit-ethernet ge-1/1/2 ether-options 802.3ad ae6

Step3 Configure the VLANs.

admin@Switch5# set vlans vlan-id 10-20
admin@Switch5# set interface aggregate-ethernet ae6 family ethernet-switching native-vlan-id 10
admin@Switch5# set interface aggregate-ethernet ae6 family ethernet-switching port-mode trunk
admin@Switch5# set interface aggregate-ethernet ae6 family ethernet-switching vlan members 10-20

Verify the Configuration

You can use the run show mlag domain command to display the global MLAG domain information.

admin@Switch1# run show mlag domain summary
Domain ID: 1 Domain MAC: 48:6E:73:FF:00:01 Node ID: 0
-----------------------------------------------------------------------
Peer Link Peer IP         Peer Vlan Neighbor Status Config Matched MAC Synced # of Links
--------- --------------- --------- --------------- -------------- ---------- ----------
ae3       10.10.10.2      4088      ESTABLISHED      Yes            Yes        1

You can use the run show mlag link command to display MLAG link information.

admin@Switch1# run show mlag link summary 
# of Links: 1
Link   Local LAG   Link Status   Local Status   Peer Status   Config Matched   Flood
----   ---------   -----------   ------------   -----------   --------------   -----
1      ae1         IDLE          UP             UNKNOWN       No               No

You can use the run show mlag consistency-parameter command to display the result of MLAG configuration consistency check, including the global and per MLAG configuration.

admin@Switch1# run show mlag consistency-parameter link 1
Port Configurations:
-----------------------------------------------------------------
Property                 Local Value      Peer Value       Result
-----------------------  ---------------  ---------------  ------
MTU                      1514             1514             PASS  
Mac Learning             Yes              Yes              PASS  
Lag Mode                 LACP             LACP             PASS  
Native Vlan              1                1                PASS  
Port Vlan Mode           Trunk           Trunk             PASS  

Spanning-Tree Configurations:
-----------------------------------------------------------------
Property                 Local Value      Peer Value       Result
-----------------------  ---------------  ---------------  ------
Mode                                                       PASS  

admin@Switch1# run show mlag consistency-parameter summary 
Overall : PASS
--------------
Global  : PASS
Link 1  : PASS


MLAG Configurations:
-----------------------------------------------------------------
Property                 Local Value      Peer Value       Result
-----------------------  ---------------  ---------------  ------
Domain ID                1                1                PASS  
Node ID                  0                1                PASS  
Peer VLAN                4088             4088             PASS  
Link Count               1                1                PASS  
Link IDs                 2                2                PASS  
                          
Spanning-Tree Configurations:
-----------------------------------------------------------------
Property                 Local Value      Peer Value       Result
-----------------------  ---------------  ---------------  ------
Enable                   No               No               PASS    

DHCP Snooping Configurations:
-----------------------------------------------------------------
Property                 Local Value      Peer Value       Result
-----------------------  ---------------  ---------------  ------
Enable                   No               No               PASS  

IGMP Snooping Configurations:
-----------------------------------------------------------------
Property                 Local Value      Peer Value       Result
-----------------------  ---------------  ---------------  ------
Enable                   No               No               PASS

You can use run show vrrp command to view the configuration information of VRRP group. The result of show command on Switch1 is as follows.

admin@Switch1# run show vrrp
Interface:                    20
VRID:                         20
Version:                      2
Load-balance:                 enable
State:                        Master
Master IP:                    11.251.201.1
Virtual MAC:                  00:00:5e:00:01:01
Preempt:                      enable
Adver Interval:               4
Priority:                     100
Virtual IP:                   11.251.201.3
Auth-type:                    none
Auth-key:

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