1600 mtu

Hi all,

I am attempting to make my backhaul links capable of 1600mtu - are there any issues that I should be aware of that might cause troubles?

There is one issue I have run into that is a little odd.. I have 2 xr5’s pointing at eachother, each with a rb/433ah - and one of the links, though I changed it to 1600mtu, does not actually register the mtu size change. The reason I am aware of it not changing is because I am running OSPF and it tells me something like: MTU mismatch: mine: 1500 - remote: 1600

This is after it is applied, the mtu simply doesn’t change. Any ideas?

set 1 ack-timeout=dynamic adaptive-noise-immunity=none allow-sharedkey=no \
    antenna-gain=0 antenna-mode=ant-a area="" arp=enabled band=5ghz-turbo \
    basic-rates-a/g=6Mbps burst-time=disabled comment="" compression=no \
    country=no_country_set default-ap-tx-limit=0 default-authentication=yes \
    default-client-tx-limit=0 default-forwarding=yes dfs-mode=none \
    disable-running-check=no disabled=no disconnect-timeout=3s \
    frame-lifetime=0 frequency=**** frequency-mode=manual-txpower hide-ssid=\
    no hw-retries=4 mac-address=**:**:**:**:**:** max-station-count=2007 \
    mode=station mtu=1600 name=32db-Vpol noise-floor-threshold=default \
    on-fail-retry-time=100ms periodic-calibration=default \
    periodic-calibration-interval=60 preamble-mode=both \
    proprietary-extensions=post-2.9.25 radio-name=00156D64***** rate-set=\
    default scan-list=default security-profile=BH_***** ssid=**********  \
    station-bridge-clone-mac=00:00:00:00:00:00 supported-rates-a/g=\
    6Mbps,9Mbps,12Mbps,18Mbps,24Mbps,36Mbps,48Mbps,54Mbps tx-power-mode=\
    default update-stats-interval=disabled wds-cost-range=50-150 \
    wds-default-bridge=none wds-default-cost=100 wds-ignore-ssid=no wds-mode=\
    disabled wmm-support=disabled

Though it currently is set to 1600, whenever the other interface is changed to 1600mtu OSPF will go down because of MTU mismatch.

Any help would be appreciated

Thanks,
Josh