About Jack K

Jack K · 07-05-2021

Hello everyone I have an interesting puzzle for you to resolve. There is an idea to create an internal DMZ for servers with private VLANs in an inter-VLAN routing environment. The Cisco L3 switch on which it will would be configured is connected with...

Jack K · 06-24-2021

Hi all I need your help. I tried to search through the Internet but with no success. In our network we have one Cisco WS-C2960X-48TS-LL switch. However it's not possible to implement IP Source Guard and DAI because there is lack of "ip verify source"...

Jack K · 04-03-2019

HelloI'm writing regarding an issue of high CPU utilization that I have on a Cisco Router 2911. It appears when any traffic longer than few seconds is started. I have gone through many documentations and forums and for now I haven't found the right s...

Jack K · 07-07-2021

@Elliot DierksenThanks for your concerns, however regarding the 3rd question, I just was curious if it's possible, but not intended to do it ;D

Jack K · 07-07-2021

@Giuseppe Larosa, thank you for your detailed information. It seems to be true what you wrote. I'll check it on Friday and see how it works. Regarding the 3rd question, I just was curious if it's possible, but not intended to do it ;D

Jack K · 07-05-2021

@balaji.bandi Thanks for quick response, however it doesn't work for me. I know how to use ACLs on vlans. I just have questions and I want to get answers to them. No need for other solutions 

Jack K · 06-28-2021

@Mark ElsenThank you for your quick reply. However this Cisco Feature Navigator is not reliable in my case, because as well it doesn't show other older switches as Catalyst 3560x which has all the mentioned features. It also doesn't show that WS-C296...

Jack K · 04-10-2019

Hello MarkThank you for your suggestion. I also claim that this device is not proper to cope with these network requirements. However I was wondering if there is a possibility to lower the utilization of the CPU. So temporarily I reduced most of serv...

Member Since	‎04-02-2019 03:55 AM
Date Last Visited	‎10-13-2021 12:10 AM
Posts	8

User Statistics

User Activity

Private VLANs in an inter-VLAN routing environment with no switchport interface connected to the router

Lack of "ip verify source" and "ip arp inspection" commands on WS-C2960X-48TS-LL

High CPU utilization on a Cisco Router 2911 / high percentage of time at the interrupt level

Re: Private VLANs in an inter-VLAN routing environment with no switchport interface connected to the router

Re: Private VLANs in an inter-VLAN routing environment with no switchport interface connected to the router

Re: Private VLANs in an inter-VLAN routing environment with no switchport interface connected to the router

Re: Lack of "ip verify source" and "ip arp inspection" commands on WS-C2960X-48TS-LL

Re: High CPU utilization on a Cisco Router 2911 / high percentage of time at the interrupt level