Need help with network design

[dilu]

Hello,

I am currently trying to find/test the best solution for the network below:

Switch X670-1,2,3 and 4 are already in use, switch X670-5 and 6 are new.
1,2,3 and 4 are currently connected with MLAG.

X670-1 and 2 are present on one site.
X670-3 and 4 are present on one site.
X670-5 and 6 are present on one (new) site.

I have the above set up in a testlab.

Should i configure EAPS or ERPS for this setup or can is simply use MLAG?
I am afraid i will get loops if I connect the switches like this.

Can anyone give me some tips how i can do this the most effectively.

[Patrick_Voss]

Unfortunately this will not work because you cannot have your ISC and MLAG port on the same link. If you want to Have all 3 connected together using MLAG you need to make the horizontal links the ISC and the vertical links the MLAG ports. This is however a major design change and without a link crossing from 2 to 3 and 1 to 4 you wouldn't be utilizing the two-tiered MLAG to it's full potential.

[Patrick_Voss]

Hello Dilu,

The "lag split" i mentioned is talking about the client switch that is connecting to the MLAG peers. for example, sw1 and sw2 are mlag peers. You create a 2 port lag on sw3 (ports 1,2). Port 1 will go to sw1 and port 2 will go to sw2. This is the split I am referencing since both ports aren't going to the same switch.

If you are on 15.5 or above one switch can be peered with up to 2 switches.

[dilu]

Hi Patrick,

Ah thanks i understand.
Moving connections/links unfortunately isn't possible.

I don't quite understand what you mean with a "lag split" could you elaborate on that please?
Can't i just make 1 and 3 MLAG peers?

[Patrick_Voss]

This will work as long as the ports heading up to each peer (not the ISC) are configured as MLAG ports. In order to fully utilize this design it would be best to create a lag split from x670-1 to 3,4 and from x670-2 to 3,4. This way you can utilize the 2-tier MLAG setup. Here is an article that explains more:

https://gtacknowledge.extremenetworks.com/articles/How_To/Sample-configuration-for-two-tier-MLAG

This design can be turned into a 3-tier MLAG setup but I believe you will have to move the connections from 5,6 to 1,2 or 3,4. Considering 1,3 are not MLAG peers they will not share the necessary information for the design above to work.

Let me know if you have any questions.

[dilu]

Hi Patrick,

Thanks for your reply.
I wasn't planning on stacking any of the switches actually.

At this moment:
X670-1 and 2 are MLAG peers.
X670-3 and 4 are MLAG peers.
X670-5 and 6 are MLAG peers.

They have the following configs:

X670-1:
enable sharing 15 grouping 15,16 algorithm address-based l3_l4 lacp
create vlan ISC-1-2
configure vlan ISC-1-2 tag 20
configure vlan ISC-1-2 add ports 15 tagged
configure vlan ISC-1-2 ipaddress 172.31.231.5/30
create mlag peer X670-2
configure mlag peer X670-2 ipaddress 172.31.231.6
enable mlag port 1 peer X670-2 id 101
enable mlag port 2 peer X670-2 id 102

X670-2:
enable sharing 15 grouping 15,16 algorithm address-based l3_l4 lacp
create vlan ISC-1-2
configure vlan ISC-1-2 tag 20
configure vlan ISC-1-2 add ports 15 tagged
configure vlan ISC-1-2 ipaddress 172.31.231.6/30
create mlag peer X670-1
configure mlag peer X670-1 ipaddress 172.31.231.5
enable mlag port 1 peer X670-1 id 101
enable mlag port 2 peer X670-1 id 102

X670-3:
enable sharing 15 grouping 15,16 algorithm address-based l3_l4 lacp
create vlan ISC-3-4
configure vlan ISC-3-4 tag 21
configure vlan ISC-3-4 add ports 15 tagged
configure vlan ISC-3-4 ipaddress 172.31.231.1/30
create mlag peer X670-4
configure mlag peer X670-4 ipaddress 172.31.231.2
enable mlag port 1 peer X670-4 id 201
enable mlag port 2 peer X670-4 id 202

X670-4:
enable sharing 15 grouping 15,16 algorithm address-based l3_l4 lacp
create vlan ISC-3-4
configure vlan ISC-3-4 tag 21
configure vlan ISC-3-4 add ports 15 tagged
configure vlan ISC-3-4 ipaddress 172.31.231.2/30
create mlag peer X670-3
configure mlag peer X670-3 ipaddress 172.31.231.1
enable mlag port 1 peer X670-3 id 201
enable mlag port 2 peer X670-3 id 202

X670-5:
enable sharing 15 grouping 15,16 algorithm address-based l3_l4 lacp
create vlan ISC-5-6
configure vlan ISC-5-6 tag 22
configure vlan ISC-5-6 add ports 47 tagged
configure vlan ISC-5-6 ipaddress 172.31.231.9/30
create mlag peer X670-6
configure mlag peer X670-6 ipaddress 172.31.231.10
enable mlag port 16 peer X670-6 id 301

X670-6:
enable sharing 15 grouping 15,16 algorithm address-based l3_l4 lacp
create vlan ISC-5-6
configure vlan ISC-5-6 tag 22
configure vlan ISC-5-6 add ports 47 tagged
configure vlan ISC-5-6 ipaddress 172.31.231.10/30
create mlag peer X670-5
configure mlag peer X670-5 ipaddress 172.31.231.9
enable mlag port 16 peer X670-5 id 301

Does this look ok to you?
Since they are all MLAG peers i can't use EAPS correct?