I think you misunderstood something or person who provided such info made a mistake. As far as I know NE20E-S series routers can support up to 25000000_._
Why would you choose a Huawei over a MikroTik?
I have not had a Huawei in any of my networks for over 5 years. They were all removed from service after the backdoors were discovered.
The only major security issue we are aware of on the NE platform was the accepting of labels on ports not configured for mpls, which was resolved last year.
its more about “unfair compatition” and “state-backed lobbysm” than something security-related.
btw, because FCC, DoC and NSA regulation - its Mandatory to have one on both silicon, firmware and software levels for networking gear
(so most if not all SoC, SDK and resulting firmware - are infested with
genrally its unwise to blindly trust to FUD govt or corporations(or sometimes individuals tend to spread out.
there was almost 20 networking-relevant “Special Sources” programms in NA “Intelligence Community”, even among actual/active and most relevant to exact topic are named “Hammermill”.
in fact they(US govt)pissed off by “incompletely implemtation” of it(its legal and some features still remain “optional”. and they tend to be addicted to some of, sadly) and launched relevant crippling/exploitation programm named funny “Turbopanda”
other relevant portions are, used ajaced together with are “HAMMERSTEIN”, “HAMMERCHANT”, “TURMOIL”, “TURBINE” interconnected over “ISLANDTRANSPORT” into “APEX”
they even announced external signalling to both h323(“FASHIONCLEFT” , SIP and even to SSTP and L2TP and etc implementations by corporations
classic metadata-based collection like say TURMOIL & PRESSUREWAVE will works okay to so they can kill people by drones or armed operatives on foot(no courts, no fair trials, no evidences, no even basic check/re-check sequence other countries intel employ&enforce)
airgapped solutions with things like say “СHIMNEYPOOL” and alike implants into different kind of gear from smartphones and servers to telco and even medical equiment(each had - own codename)
classic “keyword” collection by programms like “KEYCARD” stay operational aswell. https://youtu.be/BMwPe2KqYn4 https://youtu.be/Y1aU3uw1QnA https://youtu.be/Nzp481dTedA https://youtu.be/5_P4L7LcJig https://youtu.be/Y65LbFWCf0A https://youtu.be/N4-5MMTbSlA https://youtu.be/ExuiPFiQrB4 https://youtu.be/tzzDMD8pFqk https://youtu.be/QqvRzRj9tHE https://youtu.be/pJpFw7339_M https://raw.githubusercontent.com/TransparencyToolkit/NSA-Data/master/text/media-35513.txt https://archive.org/stream/pack-e419d5488c1c213a5f5150fff67afd0a6821e9f6/documents/files/pdf/media-35513_djvu.txt
while i prefer RB devices for most uses if i “had to” go with something Chinese - i usually pick ZTE or some 2 or 3 echelon brands
for majority of usual reasons. Huawei despite relatively big and wealthy - not introduce almost anything to networking, just “repackage and sell” others technology, even despite they tend to promote themselves(as many of other companies) as “innovators, inventors and creators of something ingenuine”, other Chinese companies - succeed in that terms Way more and had quite Interesting products sometimes(not flawless in many cases, but promising . nobody perfect, anyway.