LAN port caps at 100Mb

Newbie to openwrt, installed openwrt on x86 machine (NA ZBOX-CI327NANO-GS-01 Intel Intel(R) Celeron(R) CPU N3450 @ 1.10GHz). WAN is detecting as 1GB but LAN is displaying as 100Mb. My setup - Coax --> Modem --> (cat5e) openwrtrouter --> (cat7) DPN mini ( deeper network ) --> ( Cat6) Gigabit Switch, seeing speeds of 100Mb on all the devices. My plan is 500/25. Earlier I used Orbi Pro Router It was giving advertised speeds, now it is in AP mode. my output ethtool eth0
Settings for eth0:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supported pause frame use: Symmetric Receive-only
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised pause frame use: No
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Link partner advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Link partner advertised pause frame use: Symmetric Receive-only
Link partner advertised auto-negotiation: Yes
Link partner advertised FEC modes: Not reported
Speed: 100Mb/s
Duplex: Full
Auto-negotiation: on
master-slave cfg: preferred slave
master-slave status: slave
Port: Twisted Pair
PHYAD: 0
Transceiver: external
MDI-X: Unknown
Supports Wake-on: pumbg
Wake-on: d
Link detected: yes

I know that

Link partner advertised link modes:  10baseT/Half 10baseT/Full
	                                     100baseT/Half 100baseT/Full is capped at 100

Is there some setting that I am missing. Thank you Kidtaroi

First thing to test is always the cables. Try known good (ideally short) cat5e or cat6 cables that have been proven to work properly at gigabit speeds.

Also check the ports for debris or bent pints or anything else that could cause a bad connection.

And, of course, double check that the next connected device is gigabit (and if it is configurable such as on a computer or a managed switch, that it is set to gigabit).

The cables, though -- those are a common thing. Don't assume that they're good just because they're new or they're high-spec cables... sometimes they get damaged or have manufacturing issues.

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Likely one pair is cut off

Changed the wire and the port and it reverted back to 1GBPS

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