About chad patterson

chad patterson · 04-06-2020

I think I have fallen victim to the CSCun66310 bug: Nexus 5596: System fails to boot after a power cycle The resolution posted is to run a certain script then upgrade to a certain stable image. But my question is; if I cant even get console access th...

chad patterson · 04-02-2019

I am interested in getting all of my Cisco routers and Switches (with IOS <= 12.2) to use Azure MFA for SSH login. I do not want to use ASA or ISE or anything else like that. I would like to just authenticate them against a RADIUS or TACACS+ server, ...

chad patterson · 09-18-2018

I am trying to connect an IOSvL2 switch to a unmanaged switch with two connections, to intentionally create a loop. VIRL will not allow this, as it throws the error; Duplicate connection from node "iosvl2-5" to network(s) "unmanagedswitch-1": proble...

chad patterson · 09-14-2018

In a VIRL simulation I have two IOSvL2 switches connected together. Each switch has a VLAN 101 interface, and the ports they are connected to each other on are access ports. If I change the VLAN 101 to primary private, they lose the ability to connec...

chad patterson · 09-13-2018

Hello all, I am trying to connect two switches together using two ports. Rather than using STP or something, I am trying to prevent looping by implementing private vlans; to isolate the ports from one another. On Switch #1, I have created two priv...

chad patterson · 04-06-2020

Of course that's the proper route, but that is not an option in this case; there is no contract or warranty for this switch, hence my S.O.S. post to the community boards. Now back to the topic; Is there a way to manually flash the eeprom chip? I can...

chad patterson · 04-06-2020

Nothing. I cant get a console. The STAT light on the front remains a constant amber.

chad patterson · 04-02-2019

I am also interested in getting all of my Cisco routers and Switches (with IOS <= 12.2) to use Azure MFA for SSH login. It seems that you have done this successfully.Does it require any extra configuration on the Cisco switch, other than authenticati...

chad patterson · 03-13-2019

Ths document says that you can: https://www.cisco.com/c/en/us/support/docs/security-vpn/secure-shell-ssh/212178-Configuring-SSH-with-x509-authentication.html also Public Key Infrastructure Configuration Guide, Cisco IOS Release 15MT

chad patterson · 02-20-2019

Be careful. I ran into a timer issue today while trying to secure my OSPF implementation with MD5 auth. https://learningnetwork.cisco.com/message/714297#714297

Member Since	‎07-08-2011 01:44 AM
Date Last Visited	‎04-08-2020 12:57 AM
Posts	78
Total Helpful Votes Received	21

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User Activity

Cisco 5596UP Fails to Allow Console Access After Reboot

SSH to Cisco switch/router (with IOS <= 12.2) with Azure MFA

How can I connect two connections from a single node to an unmanaged switch node in VIRL?

Changing a VLAN to private primary renders it unable to communicate with other switches.

Connecting two Catalyst IOS switches using private-vlan isolated ports

Re: Cisco 5596UP Fails to Allow Console Access After Reboot

Re: Cisco 5596UP Fails to Allow Console Access After Reboot

Re: MFA for Cisco switches and routers

Re: Is ssh with pki possible?

Re: OSPF hello timers