http://networknick.net/blog Events, trends, hacks, tools, and the occasional rant from a networking consultant. Wed, 16 Sep 2009 06:50:15 +0000 http://backend.userland.com/rss092 en Magnum 1 and 2 in the TACC datacenter. Amazing. Magnum = a 5-stage, 3500 port IB switch @ TACC. Cable management? ...I'd call that cable execution! More details (and Andy's math) here: http://blogs.sun.com/jonathan/entry/size_matters http://networknick.net/blog/?p=65 For all of you that were wondering, I've left HP ProCurve for a new opportunity, Arista Networks. Arista is a 10 gigabit Ethernet provider, focusing on next generation data center interconnect. I'll still be around to answer questions and post thoughts, even if they are about ProCurve. However, I may ... http://networknick.net/blog/?p=61 For your downloading pleasure. http://networknick.net/blog/?p=55 There is another often requested feature now in the code base. The "pipe". Strangely it isn't documented, but you have the standard begin/include/exclude set of options. Usage: show run | begin vlan http://networknick.net/blog/?p=53 So here's one for you...as of the K.13.X release of code, you now can use DHCP options 66 and 67 to specify a TFTP server and filename for configuration at boot. The switch listens by default for these options. Combine that with the "auto-tftp" command, and voila!...You have a switch ... http://networknick.net/blog/?p=46 So it looks like I was running an older version of Wordpress for my blog and fell victim to this vulnerability. NOT PRETTY. Cleaned it all up and upgraded to 2.5, but man, what a pain. Either way, hope no one visited and got a virus from the hidden frame code. ... http://networknick.net/blog/?p=45 So I was at a client site this week troubleshooting a strange traffic mirroring issue. It went something like this: I thought the ProCurve 3500 mirror port was dropping specific inbound oversized SIP packets on the outbound mirror port. The actual traffic went through, but the mirror port only saw the continuation ... http://networknick.net/blog/?p=44 When working with ProCurve products and SNMP, we do a lot with ifIndex, standardized in the RFC 2863 IF-MIB. Of course, the physical/logical correlation of the ProCurve interfaces with the MIB ifindex entries don't line up, ie, port A1=ifindex 1, but port B1=ifindex 25. Also, VLAN's and loopbacks get their ... http://networknick.net/blog/?p=43 Pretty much everyone knows that reserved multicast addresses are always flooded on ethernet networks. IGMP does not program filters for packets addressed to the "Reserved Multicast Address" range. There are Reserved Addresses at Layer 3 (i.e., 224.0.0.1 - 224.0.0.255) that at layer two are indistinguishable from a broader range of ... http://networknick.net/blog/?p=42 I've had a lot of partners and customers lately asking me for a Cisco interop document from ProCurve. These aren't officially sanctioned, but should do the trick. Here is the link to a zip file containing the following: Cisco interop powerpoint: This was put together by one of the European technical consultants, ... http://networknick.net/blog/?p=41