Friday, March 19, 2010

Key Change for Cisco IOS 15 — Feature Licensing and How We Work.

Key Change for Cisco IOS 15 — Feature Licensing and How We Work.

January 13, 2010 by Greg Ferro · 9 Comments 

Welcome to IOS 15, Feature licens­ing and com­plic­ated main­ten­ance procedures.…

Cisco Announces EOS and EOL Cisco IOS Software Release 12.4

Cisco Announces EOS and EOL Cisco IOS Software Release 12.4

January 13, 2010 by Greg Ferro · 3 Comments 

Cisco announces the End of Life and End of Support dates for 12.4. Before IOS 15.0 is even warm­ing up, the pre­vi­ous ver­sion of 12.4 is already on life support.

The Poor Man’s IOS Traffic Generator

September 19, 2009 by Greg Ferro · 7 Comments 

This is a fea­ture that I used to use years ago, but had for­got­ten about. For some reason, I remembered it today and it is still as use­ful as it ever was. Read on…

IOS CLI: Show Run Linenum

September 9, 2009 by Greg Ferro · 4 Comments 

This Post is Part of a Series  —  click for list on Console Mastery» You prob­ably know this one already, but I have been typ­ing “wr t” for a long time and never stopped to look. Puts a line num­ber at the side of the con­fig so you can say to the per­son on the other end of the phone, see […]

Cisco IOS Order of Operation — Updated, Again

Cisco IOS Order of Operation — Updated, Again

September 9, 2009 by Greg Ferro · 11 Comments 

I often need to refer to the IOS order of oper­a­tion when I start stack­ing mul­tiple func­tions in an IOS configuration.

Changing the Break Character in Cisco IOS

August 21, 2009 by Greg Ferro · 8 Comments 

Does press­ing “Ctrl-​​Shift-​​6 & x” bother you ? It bugs the hell the out of me.

IOS: Setting the TCP Timeout on IOS

August 14, 2008 by Greg Ferro · 1 Comment 

One of my favour­ite default com­mands on IOS is “ip tcp syn­wait 5″. Lets look into this com­mand and why you might like to use it as well.

IOS: Enable and .… Disable ?

July 20, 2008 by Greg Ferro · 1 Comment 

This Post is Part of a Series  —  click for list on Console Mastery» All these years, and I didn’t real­ise the oppos­ite of the enable, was dis­able.
List of Posts in this series:Serial Console on OSXIOS: Reverse SSH con­sole access  —  Part 2IOS: enable and .… dis­able ?IOS: Setting the TCP timeout on IOSIOS:CLI Tip  —   ter­minal full help OS X:Terminal break for Serial […]

IOS: ROMMON on the C6500/​Sup720 — Lesson Learned

June 28, 2008 by Greg Ferro · Leave a Comment 

Recently, one of my Supervisor 720 goes into a per­man­ent reboot cycle. I was able to break it into ROMMON mode, but I couldn’t get it to ‘stick’ the boot set­tings.
Finally.…

IOS: Reverse SSH Console Access — Part 2

IOS: Reverse SSH Console Access — Part 2

June 25, 2008 by Greg Ferro · 3 Comments 

Following my ori­ginal post about con­fig­ur­ing Reverse SSH on a Cisco con­sole server, I wanted to make some fol­lowup to extend the usage.

Configuring Windows 2003 /​ XP SP2 to Use IOS NTP Server

June 10, 2008 by Greg Ferro · 5 Comments 

In cer­tain net­works, it is dif­fi­cult to get the time on your serv­ers to be exactly the same as the NTP time on your net­work equip­ment. In this case, you want to force the Windows serv­ers to use the same NTP Network time source as your routers and switches. But Microsoft Windows doesn’t under­stand NTP […]

IOS:Open Source Lab DNS and IP Addressing

June 2, 2008 by Greg Ferro · 1 Comment 

A num­ber of Cisco Bloggers have talked about mak­ing labs avail­able for oth­ers to use. However, part of what will be needed is some con­ven­tions to make these labs work for the largest num­ber of people.
Following Ivan Pepelnjak post­ing on Private Domain Names, and an earlier post­ing that I made on Reserved IP Address […]

IOS: Reverse SSH Console Access

IOS: Reverse SSH Console Access

May 29, 2008 by Greg Ferro · 6 Comments 

I recently needed to secure the reverse con­sole access using Cisco IOS router. Now for many years, we have been doing this over tel­net and the con­fig­ur­a­tion has been straight­for­ward. But con­fig­ur­ing it to sup­port SSH instead of tel­net is a little bit dif­fer­ent, awk­ward in fact.

Ip Tcp Timestamp

April 14, 2008 by Greg Ferro · Leave a Comment 

ip tcp timestamp
I have seen this com­mand a few times, today I am going to look into it and see what it does. Also, this is prob­ably a clas­sic CCIE lab gotcha.

Bidirectional Forwarding Detection  [Cisco IOS Software] — Cisco Systems

March 8, 2008 by Greg Ferro · Leave a Comment 

BFD is a most use­ful fea­ture of IOS, and IMHO, a much unloved fea­ture. I notice that latest releases of IOS now have BFD for static rout­ing, but more import­antly now supports HSRP

standby bfd
Example:
Router(config-if)# standby bfd
(Optional) Enables HSRP sup­port for BFD on the inter­face
standby bfd all-​​​​interfaces
Example:
Router(config)# standby bfd all-​​​​interfaces
(Optional) Enables HSRP sup­port for BFD on all interfaces.

Bidirectional Forwarding Detection  […]

On the Death and Rebirth of IOS — Why Did It Take So Long ?

March 5, 2008 by Greg Ferro · 3 Comments 

The mar­ket has been com­ment­ing on the rise of Juniper for some years and the fact that Cisco has not been able to stop them grow­ing. Well, we can now see that Cisco was listen­ing to the stock mar­ket by spend­ing a lot of time and money devel­op­ing a new oper­at­ing sys­tem. Oh yeah, and some new […]

Single Internet Connection but HA Infrastructure — Using Bridging Instead of Routing

Single Internet Connection but HA Infrastructure — Using Bridging Instead of Routing

February 20, 2008 by Greg Ferro · 1 Comment 

The cus­tomer had decided to build a host­ing plat­form, but could only arrange for a single inter­net con­nec­tion to that site due to loc­a­tion. However, all other hard­ware was duplic­ated for high avail­ab­il­ity. After con­sid­er­ing the options the fol­low­ing dia­gram was pre­pared show­ing the first pass at the design. This was the Internet Connection (100Mb Ethernet) con­nec­ted to the router, then con­nec­ted to a switch, which was inter­con­nec­ted by trunk to a second switch. The first layer of fire­walls is then connected.

Cisco ASA and IOS Command Tip — Test Aaa-​​Server

February 18, 2008 by Greg Ferro · Leave a Comment 

I have been work­ing on a VPN setup that loads the Group Policy from a CiscoSecure ACS server. During the pro­cess I dis­covered the test aaa-​​​​server com­mand. Its very handy tool when you are doing this kind of stuff.
Read on.….