Cisco

OSPF Notes - Network Types

2011-06-04 ·1 min read

Corrections are always welcome. Broadcast : Think an Ethernet segement DR/BDR? : Yes Default hello interval : 10 sec Neighbor config required? : No Point-to-point : Physical point-to-point links, …

350-001 ccie network ospf type

I got a call from our Systems and Security guys today to talk about a Wireshark capture they had done from a user VLAN. They had noticed two frames that were destined for some seemingly random host in …

capture etherip header wireshark

OSPF Notes - LSA Types

2011-06-02 ·2 min read

Yes, it is inevitable that I cover these. I’m sure network types will be next. Per my usual request, please correct my stupidity. Type 1 - Router : This LSA type lists all the routers by RID as …

350-001 ccie cisco dbd hello lsa lsack lsr lsu message ospf type written

OSPF Notes - Neighbor States

2011-06-02 ·2 min read

My prediction about covering network types was wrong. I’m going to puke out some information about neighbor states for now. As is always the case, corrections are welcome. Down : No hellos have …

350-001 ccie cisco dbd hello lsa lsack lsr lsu message ospf type written

OSPF Notes - Message Types

2011-06-01 ·2 min read

I have had my nose deep in several books in preparation for my CCIE R&S written exam, so I haven’t been blogging much at all. Now that I’ve made it to the more familiar topics, …

350-001 ccie cisco dbd hello lsa lsack lsr lsu message ospf type written

Home-grown IOU Scripts

2011-05-16 ·6 min read

I’m sure you’ve all heard of Cisco IOU by now, and I’m finally catching up with the other bloggers of the world by mentioning it. It’s an executable version of an IOS image …

bash cisco emulator iou lab script

Cisco Live 2011 Schedule

2011-04-29 ·2 min read

For the first time ever, I’m headed to Cisco Live - the big Cisco users conference in Las Vegas! I usually don’t go to these things since I wind up just hanging out by myself, but …

2011 cisco cllv11 conference las las-vegas live users vegas

Configuring an IPv6 Tunnel with Hurricane Electric

2011-03-31 ·2 min read

My ISP at home is great. I have infinite bandwidth because they have no idea how to do any rate limiting. Heck, they’re not even skilled enough to know that I have several public IP addresses …

broker dns eui-64 ipv6 ipv6ip manual tunnel

Stubby Post - Final Tally of 3750 Failures

2011-03-18 ·1 min read

It’s pretty widely known that I hate Cisco 3750 switches. We’ve had so many hardware and software failures with them that I’ve got a seriously bad taste in my mouth. Since I’m …

3750 cisco fail failure rate rma statistics tac

Stubby Post - Cisco IOS Petition

2011-02-11 ·1 min read

Greg Ferro has brought back the petition for Cisco to provide an emulator to the community for learning. Since our current and only family of emulators is well on Garcinia Mangostana its way to …

cisco ios petition