Cisco IOS – Enabling LLDP
Mar08

Cisco IOS – Enabling LLDP

KB ID 0001289 Dtd 08/03/17 Problem If you're running Cisco IOS on all you devices then you can use CDP  to see what's directly connected, (unless you are on a Cisco firewall, but I did say IOS devices).  Petes-Switch#show cdp neighbors Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone, D - Remote, C - CVTA, M - Two-port Mac Relay Device ID Local Intrfce...

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Cisco Licence Differences LAN-Lite / LAN Base / IP Base / IP Services
Jan11

Cisco Licence Differences LAN-Lite / LAN Base / IP Base / IP Services

KB ID 0001270¬†Dtd¬†11/01/17 Problem Actually finding the answer to this question is far more challenging than it needs to be! As usual Cisco can change this on a whim so before you purchase any equipment it’s still a good policy to check on the feature navigator. Solution This is about the best reference I’ve found. Although anyone who can tell me what the correct Layer 2 differences between Enterprise Access and Complete...

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Cisco IOS – How To Find VLAN IPs (SVI’s)
Nov16

Cisco IOS – How To Find VLAN IPs (SVI’s)

KB ID 0001258 Dtd 16/11/16 Problem If you have a complicated network, you can spend more time finding out how it's configured, than actually doing any work on it! Today I had a client that needed some changes made on their LAN, I knew their name, and their network address, and common sense told me which of the core switches they were connected to. Solution A quick search on the client name told me what VRF they were in, and what VLAN...

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Cisco IOS ‘Crypto’ Unrecognized Command?
Oct15

Cisco IOS ‘Crypto’ Unrecognized Command?

KB ID 0001246 Dtd 15/10/16 Problem I was working on a Cisco 3750-G last week, and I was in the process of setting up SSH access. When I went to generate the crypto key and enable SSH, It fired an error at me. In fact it wouldn't execute any crypto commands; Core-SW(config)#crypto ? % Unrecognized command   Now I have seen this before, (but not for a while). You need to be running a K9 version of the code. A quick 'show version' will...

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MAC OSX – SSH Error ‘No Matching Exchange Method Found’
Oct13

MAC OSX – SSH Error ‘No Matching Exchange Method Found’

KB ID 0001245 Dtd 13/10/16 Problem I thought my RoyalTSX had broken today, I upgraded it a couple of weeks ago, and I upgraded to macOS Sierra version 10.12 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 Solution This is not Apple's fault, it's OpenSSH version 7. SHA1 is weak, so...

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Cisco Stacking 3750 Switches
Jun16

Cisco Stacking 3750 Switches

KB ID 0001205 Dtd 17/06/16ProblemYou can stack Cisco 3750-X Switches in groups of up to 9 switches, and they can then be managed as one switch. Here I've got 2 switches. SolutionRemoving 3750-X Switches Stack ConfigurationOne of my switches had already been in a stack, so I needed to remove its stack configuration. It thought it was switch 4 in the stack so I issued the following commands; Switch(config)# no switch 4 provision...

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