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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. 

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 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 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 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 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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