Fabric Implementation

[dazza]

Hello! 

I have a new job and one of the first tasks is to implement Fabric Connect. The previous admin had ordered 10 5420 switches (which are onsite)  and I have a design of sorts that has 3 stacks in an EAPs ring (of sorts). Initially I was confused as I expected to have 1 or 2  7720 switches too (SPF aggregation switch) to form a leaf and spine network. 

I understand that stacking can be done only  in pairs via the QSFP slots on the 5420? (therefore a redesign is needed)

I just wanted to run my initial findings by the community as I am confused how a consultation with extreme partners prior to my arrival would result in a triple stacked EAPs ring being purchased.

Any feedback is greatly appreciated as I am about to revert to traditional IP networking solution!

Darren

[dazza]

Sorry should have been clear, it is using the VIST/SMLT clustered pairs inconnecting using the SFP-DD ports. 

Guy on fabric course I  said they tried it and it did not work, will file a case with GTAC Thanks

[EF]

Hi Dazza,

The 5420 switches are universal hardware so it can be used with two diferents software families:

- EXOS
-VOSS

It can be selected at the first boot or then it can be chage with a special procedure.

If you want to uses stack topology you must run EXOS, VOSS doesnt support stack config.

Best!!!

EF

[dazza]

Historic information found is that the documentation states the SFP-DD ports can only be used in VOSS without fabric-connect. 

Others asking about it here 5420 stack ports VOSS : r/ExtremeNetworks (reddit.com)

?

[dazza]

I have a redesign for the network using 2 distribution and 6 access switches. It can work if the answer to the following question is yes, can the U1/2 links be used on the 5420 in VOSS to interconnect the distribution switches each 5420 has a 4 SPF for connections?