Syntax
show mac-address
[
vlan
<vlan-id>
][
<PORT-LIST>
][
mac-addr
]Listing all learned MAC addresses on the switch, with the port number on which each MAC address was learned
Listing all learned MAC addresses on one or more ports, with their corresponding port numbers
For example, to list the learned MAC address on ports A1 through A4 and port A6:
Listing all learned MAC addresses on a VLAN, with their port numbers
- 35 - HP LaserJet Director (Mac OS) 36 HP LaserJet Director 36 Windows 36 Mac OS HP LaserJet Document Manager (Windows 98, 2000, Millennium, NT 4.0, and Mac OS) 36 37 - HP LaserJet Document Manager (Windows) 37 - HP Workplace (Mac OS) 38 ' ˇ ) ˜ 38 HP LaserJet Copier (Copy Plus) 38 HP LaserJet Director Toolbox (Windows 9x, 2000, Millennium.
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This command lists the MAC addresses associated with the ports for a given VLAN. For example:
HP Switch# show mac-address vlan 100 NOTE: The switches operate with a multiple forwarding database architecture. Finding the port on which the switch learned a specific MAC address. For example, to find the port on which the switch learns a MAC address of 080009-21ae84. HP receives the prestigious IEEE Milestone in Electrical Engineering and Computing award for its HP-35 scientific calculator. Introduced in 1972, the HP-35 was the world's first handheld-sized scientific calculator, standing apart from its peers, which could only perform four basic functions – addition, subtraction, multiplication and division.
NOTE: The switches operate with a multiple forwarding database architecture. |
Finding the port on which the switch learned a specific MAC address
For example, to find the port on which the switch learns a MAC address of 080009-21ae84:
This feature lets you determine which switch port on a selected VLAN is being used to communicate with a specific device on the network.
From the Main Menu, select:
1. Status and Counters ..
- The switch then prompts you to select a VLAN.
- Use the Space bar to select the VLAN you want, and then press [Enter].The switch then displays the MAC address table for that VLAN (Example of the address table.)Example of the address tableTo page through the listing, use N and P.
Finding the port connection for a specific device on a VLAN
This feature uses a device's MAC address that you enter to identify the port used by that device.
- Proceeding from Example of the address table, press [S] (for S), to display the following prompt:
- Enter the MAC address you want to locate and press [Enter].The address and port number are highlighted if found (Example of menu indicating located MAC address.) If the switch does not find the MAC address on the currently selected VLAN, it leaves the MAC address listing empty.Example of menu indicating located MAC address
- Press [P] (for P) to return to the full address table listing.
This feature displays and searches for MAC addresses on the specified port instead of for all ports on the switch.
- From the Main Menu, select:Listing MAC addresses for a specific port
- Use the Space bar to select the port you want to list or search for MAC addresses, then press [Enter] to list the MAC addresses detected on that port.
Determining whether a specific device is connected to the selected port
Proceeding from step 2, above:
- Press [S] (for Search), to display the following prompt:
- Enter the MAC address you want to locate and press [Enter].The address is highlighted if found. If the switch does not find the address, it leaves the MAC address listing empty.
- Press [P] (for P) to return to the previous per-port listing.
Updated Many Mac users today found, to their surprise, they are unable to print to their HP Inc printers.
This is due to a code-signing snafu affecting macOS Catalina (version 10.15) and Mojave (10.14), specifically. HP's printer driver software is cryptographically signed with a certificate that macOS uses to determine whether the application is legit and can be trusted. However, that certificate was today revoked through an XProtect update, causing the software to be rejected by Macs.
XProtect is the mechanism Apple uses to inform Macs to no longer trust and run certain programs, and it does this by revoking their code-signing certificates. There is no central database of certs cancelled by XProtect, there's one for each OS version it seems, and Catalina and Mojave were selected in particular. Apple chose to revoke the HP driver cert, or perhaps was asked to do so by HP.
'No questions asked' Windows code cert slingers 'fuel trade' in digitally signed malware
READ MOREHp Director For Mac
In any case, HP's driver software no longer works on those two particular operating system flavors. Users are told when trying to print, for instance, that HP's application 'will damage your computer,' and are given the option to run it anyway or send it to the trash. Trying to continue just loops you back round to the error message, with no work done. Punters are also encouraged to report this 'malware' to Apple.
Unofficial workarounds for now include using AirPrint to an HP printer, or uninstalling the HP software and using a generic PostScript driver.
A Reg reader who tipped us off about the blunder told us he was able to jerry rig some IPP connectivity to get an older device to print: 'We had a handful of printers where macOS would print into the ether. Similar to picsart. Windows had no problem. I found some IPP trickery on macOS Catalina worked on an older HP4650.'
We had a handful of printers where macOS would print into the ether. Windows had no problem Will 7zip open rar files.
Complaints from punters are building up on the Apple and HP support forums.
'Trying to open Printer Utility on MacOS 10.15.7 and I get a crash dump every time saying 'Code Signature Invalid' for the binary /Library/Printers/hp/Utilities/HP Utility.app/Contents/MacOS/HP Utility,' said one netizen.
'Yes, my Deskjet F4140 abruptly stopped working with both my Mac mini desktop AND my partner's AirBook,' complained another. 'The AirBook keeps insisting it's malware (it's not), while my desktop says the certificate has expired. Suddenly, HP and Apple are NOT playing well together! I've redownloaded and reinstalled the printer software TWICE now but nothing has changed, just the same message about HP Utility now missing. Our jobs depend on this printer, HP.'
Thomas Reed, director of Mac and mobile at Malwarebytes, tweeted to say his users were up in arms at the tech breakdown: 'We're seeing a significant influx of support cases where users are seeing macOS identify what appear to be legit processes as malware.'
Mac blogger Howard Oakley has some more background, here. 'You’re seeing that [error] message because macOS is checking the signature on your HP printer software, and being told that its signing certificate has been revoked,' he observed.
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Amazon's Music desktop app is also, weirdly enough, no longer working, either, it's reported.
Spokespeople for HP and Amazon were not available for immediate comment. Apple declined to comment. ®
Updated to add
The Register understands from sources familiar with the matter that HP Inc asked Apple to revoke its printer driver code-signing certificates. It appears this request backfired as it left users unable to print. A HP Inc spokesperson told us on Friday night:
We unintentionally revoked credentials on some older versions of Mac drivers. This caused a temporary disruption for those customers and we are working with Apple to restore the drivers. In the meantime, we recommend users experiencing this problem to uninstall the HP driver and use the native AirPrint driver to print to their printer.
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