topic SDA Border Node design consideration with a stack in Software-Defined Access (SD-Access)

SDA Border Node design consideration with a stack

Rupesh Patil — Thu, 16 Apr 2026 06:25:35 GMT

Hi Experts,

I am new to SD-Access solution. Is it a good practice to have stack of Border Node for a small site?

I came across a post stating -it is not good to have BN stacked as you lose hitless SWIM for site (assuming u have single pair of BN & FN there).

Can anyone clarify this? we have a single Fusion node and a stack of BN.

Thank you in advance!

Re: SDA Border Node design consideration with a stack

Andrii Oliinyk — Thu, 16 Apr 2026 07:04:30 GMT

for a small (usually office only) sites single stackwised BN is pretty Ok (maintenance window is easy to schedule, right?).
but for business critical sites >1 BNs are of good practice. FN redundancy should be aligned as well.
there is also use-case with L2-BN deviating form this practice afaik - overlapping VLA<->EID-space mapping will create disaster.

Re: SDA Border Node design consideration with a stack

Rupesh Patil — Thu, 16 Apr 2026 07:13:32 GMT

@Andrii Oliinyk Thank you!