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A number of our products, including but not limited to the list below, use SSDP (Simple Service Discovery Protocol) to automatically find each other on the network. Some switches might block SSDP by default.

- ALIF1100, ALIF2100, ALIF4000, ALIF102T
- AVM
- XDIP

On the Cisco C9350 switch, SSDP forwarding requires the following global command:

platform ip multicast ssdp

This command is found in Cisco’s IP Multicast Routing Configuration Guide. The guide states that -+239.255.255.250+- is blocked by default on the C9610 and requires this command. The same behavior applies to the C9350.

The documentation trail is somewhat confusing:

• August 8, 2025: IOS XE 17.18.1 was released, and the command is present but undocumented.
• September 2025: Cisco’s multicast guide documented the requirement for the C9610, but did not mention the C9350.
• April 2026: The C9350 IOS XE 26.1.1a release notes explicitly documented the -+ssdp+- keyword as a behavior change.

Because SSDP was disabled as an implicit platform default, there was no ACL, VACL, or other blocking statement visible in the switch configuration. The platform discards SSDP before it reached the switch’s embedded packet-capture path, which also explains why captures on the endpoint-facing interfaces show no UDP/1900 traffic. 

Having reviewed the software that Adder Technology Ltd develops for use in its range of high-performance KVM extenders and switches, we are able to state that none of our proprietary software includes the Log4j library and therefore none of Adder’s products are affected by the Apache Log4j 2 Vulnerability Notice - CVE-2021-44228.

Adder makes no warrant as to the impact of this potential vulnerability on third-party equipment or software packages and recommends that advice be sought directly from the manufactures of these.

The API (Application Programming Interface) for the Redundant Power Supply (RED-PSU) is now available. There is no need to upgrade the firmware, it is available on v1.0 and above.

The following products are end of life with immediate effect. The EOL part numbers and recommended replacements are shown in the following table.

A little-known feature on the AV4PRO is that the hotkeys will filter down to cascaded AV4PRO switches.

Be careful if you are using the 192.168.1.x network range for endpoints. If a transmitter or receiver is given 192.168.1.42, it cannot be added to the AIM Manager. This is because 192.168.1.42 is used for the Management port and causes the SSL security/authentication to fail.

When upgrading the firmware, the Event and Connection log archives are cleared.