2 Messages

Wed, May 12, 2021 5:12 AM


I have this same issue.  My XB7 is currently configured as a bridge.  The XB7 is connected to an Aruba 6300M 1/2.5/5G Ethernet Switch which is in turn connected to and Aruba Gateway running Firewall services.  The data path is as follows:

Xfinity Internet <-> XB7 Cable/WAN Interface <-> XB7 Port-4 <-> Aruba 2930M 1/2.5/5G DMZ switch <-> Aruba Gateway/Firewall <-> Aruba 2930M 1/2.5/5G inside switch.

All devices support 802.3bz 1/2.5/5G Ethernet.

When the XB7 is connected to my DMZ 2930M via Port-4 (2.5G port) internet downloads drop to about 400Mbps.  When the XB7 is connected to my 2930M via any of the three 1G ports internet throughput is fine at right around 980 Mbps.

The 2.5G Ethernet ports on the XB7 to not appear to behave correctly when connected to Ethernet devices that support industry standard 802.3bz such as the Aruba 6300M.  This needs to be fixed ASAP in order for Comcast customers on the 1.2G internet plan to have full access to their available bandwidth.

This post was created from this reply on different post


Official Employee


106 Messages

1 m ago

Hi, @clemagie! Thanks for letting us know you're experiencing this issue with the internet and modem. Please send us a chat so we can further assist. Can you please click the Peer to Peer chat icon at the top right of the page, click on the pen and pad icon and enter Xfinity Support in the "To" section of the chat and provide us with your first and last name so we may further assist you.

New Poster


3 Messages


I have this same exact problem but the modem used to produce speeds at 1.4Gbps. However, now it does the same thing on the 2.5Gbps port, and it will only hit 90Mbps now on that port, while still getting 950Mbps on its 1G ports. 

I'm going to swap the modem out but this needs to be resolved ASAP. 


Valued Contributor


435 Messages

It sounds like your device isn’t negotiating the correct speed, if it can’t it will default to the next lower speed which is 100 Mbps, try removing the Ethernet cable and putting it back making sure the connector is in all the way, just a thought 

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