Cisco: Getting a SKU (Product ID) From a Serial Number
Apr28

Cisco: Getting a SKU (Product ID) From a Serial Number

KB ID 0001674 Problem I had a situation a couple of weeks ago where I had the serial numbers for a bunch of Cisco switches, I needed to get some extended cover for them, but what I didn’t have were the Cisco SKU (Stock Keeping Unit) codes. Solution You will need to have a Cisco CCO login, once you have that go here > Add devices. Give the device a name, (it does not matter what) > Paste in the serial number > Add. Boom,...

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macOS – SSH Error ‘No Matching Exchange Method Found’
Sep13

macOS – SSH Error ‘No Matching Exchange Method Found’

KB ID 0001245  Problem Note Certified working all the way up to macOS Catalina version 10.15.4 I thought my RoyalTSX had broken today, I upgraded it a couple of weeks ago, and I upgraded to macOS Catalina 10.15 the other day. After this, all my SSH sessions refused to connect with this error;   Unable to negotiate with x.x.x.x port 22: no matching key exchange found. Their offer diffie-hellman-group1-sha1 Note: You may also see the...

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Cisco IOS: Ether-Channel Trunks
Apr08

Cisco IOS: Ether-Channel Trunks

KB ID 0001533 Problem This is a subject that every time I need to create an Ether-Channel I end up checking beforehand, so it’s about time I wrote it up. We are combining two different things, an Ether-channel, (an aggregation of links) and a Trunk (the ability to carry many VLANS). If you are NOT from a Cisco background then you might want to read though the following post first to avoid confusion about the world...

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Cisco ASA VPN to Cisco Router “MM_WAIT_MSG3”
Mar27

Cisco ASA VPN to Cisco Router “MM_WAIT_MSG3”

KB ID 0001531 Problem While migrating a VPN tunnel from an ASA 5520 firewall to a new 5516-X I got this problem. The other end was a Cisco router (2900). As soon as I swapped it over, it was stuck at MM_WAIT_MSG3, and phase 1 would not establish; NUFC-ASA5516x(config-tunnel-ipsec)# show crypto isa IKEv1 SAs: Active SA: 6 Rekey SA: 0 (A tunnel will report 1 Active and 1 Rekey SA during rekey) Total IKE SA: 6 1 IKE Peer: 1.1.1.1 Type :...

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Cisco ASA EZVPN (Revisited)
Nov23

Cisco ASA EZVPN (Revisited)

KB ID 0001261 Problem EZVPN is a technology that lets you form an ISAKMP/IPSEC VPN tunnel from a site with a dynamically assigned IP (EZVPN Client,) back to a device with a static IP (EZVPN Server). I’ve called this EZVPN revisited, because this is a technology I’ve talked about before. So why am I here again? Well back then I used the ASDM. If you do that now, you need to go in and mess about with things to get it to work...

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Cisco Error ‘%PHY-4-SFP_NOT_SUPPORTED’
Sep13

Cisco Error ‘%PHY-4-SFP_NOT_SUPPORTED’

KB ID 0001347  Problem This is another question I see getting asked a lot in forums! You see something like the following; 000032: *Sep 28 09:35:32.507 UTC: %PHY-4-SFP_NOT_SUPPORTED: The SFP in Gi3/0/50 is not supported (PNL-3750-Stack) 000033: *Sep 28 09:35:32.507 UTC: %PM-4-ERR_DISABLE: gbic-invalid error detected on Gi3/0/50, putting Gi3/0/50 in err-disable state (PNL-3750-Stack) The usual response is ‘Enable unsupported...

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