Cisco

CSCtd31622 - CSM, Cookies, and the year 2010

2010-01-08 ·2 min read

It seems that we have another piece of evidence that Cisco doesn’t like the CSM. From what I’m able to creatively interpret, the software developers didn’t think anyone would be …

2010 bug cisco cookie csm

ASA and Proxy ARP

2009-09-11 ·3 min read

Wow. A new entry. Everyone sit down before you pass out. I’ve got a real-world example for you today. We have an ASA 5540 installed at a business unit with interfaces in multiple networks, …

arp asa cisco fwsm nat pix proxy syn

Getting Temperature Data from a 6500 via SNMP

2009-08-19 ·2 min read

I apologize to my adoring fans (both of you) for the lack of posting. I’m in the middle of moving, buying a new house, selling my current house, getting a mortgage, etc. I’ve up until …

cisco ios oid sensor snmp temperature

BCMSN Notes - EtherChannel Distribution

2009-06-23 ·3 min read

EtherChannel lets you aggregate links into one logical connection, but the distribution of traffic is not uniform. It does not use per-packet load-balancing or the like to determine what interface in …

bcmsn calculation ccnp cisco distribution etherchannel xor

BCMSN Notes -- STP States

2009-05-22 ·3 min read

I’ve decided to take on the CCNP certification, so I’m going to wind up with a few posts will be more my own notes than anything. :) A switch port on a 2960 comes up with a default …

bcmsn blocking ccnp cisco forwarding learning listening spanning-tree state stp switch

Using SSH to Run Commands on a Router or Switch

2009-04-30 ·3 min read

SSH is more than just a shell. You can copy files from and to a server or piece of network gear with it. You can use it to tunnel traffic. Possibly my favorite, though, is to use SSH to run a command …

cisco cli csm grep privilege router ssh switch

Server NIC Aggregation to a Cisco Switch

2009-04-14 ·3 min read

Have you even noticed that your new servers all have 2 NICs on the board? At least all of them that I’ve seen in the last 3 years have. A lot of server admin actually use them in a NIC teaming …

bonding cisco etherchannel ethernet switch teaming

RSPANs on Cisco Switches

2009-03-18 ·3 min read

We discussed SPANs earlier, but let’s talk about RSPANs for a bit. Can anyone guess what the “R” means? You guessed it – “Remote”. An RSPAN is a way to get traffic …

cisco remote rspan span switch vlan

SPANs on Cisco Switches

2009-03-13 ·3 min read

I can’t believe I haven’t blogged on this yet. SPANs are one of my favorite things in the world. The switched port analyzer (SPAN) is a mechanism on Cisco switches that allows you to take …

cisco monitor span switch tcpdump

CSM Probe Status of ???

2009-02-20 ·1 min read

I must be bored since I’m posting again. A colleague asked me to change the failed value of a TCP probe today. It was no big deal, but, when I looked to see the status of the change, I noticed …

cisco csm probe