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Explaining Two-tier MLAG design

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TitleExplaining Two-tier MLAG design
Objective
This article explains the two-tier MLAG design for a topology as below: 

User-added image
Environment
  • EXOS All
  • Summit
  • Blackdiamond
Procedure
  • While single-tier MLAG provides the redundancy at the access level, two-tier MLAG design provides the redundancy at the distribution level or the core-level. 
  • In this design, we need to have 2 ISC connections and 2 MLAG peer groups. (MLAG peers-I and MLAG peers-II).
For details regarding the basic configuration like creation of MLAG peer, ISC connection and enabling the MLAG on the ports connected to server/switch, please click How to configure MLAG in Extreme switches.
Once the ISC and the MLAG peers are created, follow the steps below to configure the two-tier setup. 

Step 1: Creation of the sharing group in each peer.

The ports from every switch connecting to the other MLAG peer group, should be a part of a LAG (either LACP or static LAG).
Static LAG: 

enable sharing <master-port> grouping <port numbers> algorithm address-based <algorithm> 

LACP LAG: 

enable sharing <master port no> grouping <port numbers> algorithm address-based <algorithm> lacp

This should be configured in all the four MLAG switches. 
When using LACP then the MLAG LACP MAC should be statically configured for the peer to be equal on both sides.

Step 2: Enabling the MLAG ports within the two-tier setup. 

The sharing group created above in every MLAG peer switches is a separate MLAG instance to the concerned peers. For example, the sharing group created in the left MLAG peer-I would be an MLAG instance with the sharing group created in the right MLAG PEER-I. Similarly, the sharing instance created in the top left MLAG PEER-II would be an MLAG instance with the sharing group created in the top right MLAG PEER-II. 

 
enable mlag port <master port of the sharing group> peer <peer name> id <id value>


Step 3: Adding data VLANs.

The data VLANs that are added in the MLAG ports should also be added to the ISC ports.


 
Additional notes
Sample configuration for the 2 tier setup below: 

User-added image

Left MLAG Peer-I switch:
 
create vlan isc
configure vlan isc tag 10
configure vlan isc add ports 1 tagged
configure vlan isc ipaddress 198.51.100.1/30
create mlag peer right
configure mlag peer right lacp-mac 00:11:22:33:44:55
configure mlag peer right ipaddress 198.51.100.2 

enable sharing 2 grouping 2,3 algorithm address-based l3_l4 lacp 
enable mlag port 2 peer right id 200

Right MLAG Peer-I switch:
 
create vlan isc
configure vlan isc tag 10
configure vlan isc add ports 1 tagged
configure vlan isc ipaddress 198.51.100.2/30
create mlag peer left
configure mlag peer left lacp-mac 00:11:22:33:44:55
configure mlag peer left ipaddress 198.51.100.1 
enable sharing 2 grouping 2,3 algorithm address-based l3_l4 lacp 
enable mlag port 2 peer left id 200

Top left MLAG Peer-II switch:
 
create vlan isc
configure vlan isc tag 20
configure vlan isc add ports 1 tagged
configure vlan isc ipaddress 198.51.100.5/30
create mlag peer top-right
configure mlag peer top-right lacp-mac 22:33:44:55:66:77
configure mlag peer top-right ipaddress 198.51.100.6
enable sharing 2 grouping 2,3 algorithm address-based l3_l4 lacp 
enable mlag port 2 peer top-right id 300

Top-right MLAG Peer-II switch:
 
create vlan isc
configure vlan isc tag 20
configure vlan isc add ports 1 tagged
configure vlan isc ipaddress 198.51.100.6/30
create mlag peer top-left
configure mlag peer top-left lacp-mac 22:33:44:55:66:77
configure mlag peer top-left ipaddress 198.51.100.5
enable sharing 2 grouping 2,3 algorithm address-based l3_l4 lacp 
enable mlag port 2 peer top-left id 300
See Community thread for related information:  https://community.extremenetworks.com/extreme/topics/reasons-for-mlag-on-summits
 

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