NetworkNick.net

For your downloading pleasure.

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 that is configured and standardized [...]

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 MAC Addresses (because the Multicast [...]

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, and discusses things like migration [...]

Check this out. It’s a Perl script (hence cross platform) that not just pulls configs, but also archives and has the option to only pull them if they’ve changed. Check out the options:

repository
The base directory for saving the configuration files.

keep
The maximum number of config files to retain for the device. When this limit is reached, [...]

While onsite with a partner today we did a plugfest with a 5406 and 4506.

We used 802.1s, with multiple instances, and ran the 4506 and 5406 as the VRRP owner for the VLAN’s that were mapped to the instances that each switch was root for. We also did some basic OSPF interop, with redistribute static..

VRRP [...]

I’ve been knee deep in SNMP lately for a very large client. I’ve come to realize that it isn’t as simple as I thought (or the name implies). Oh, don’t get me wrong, the foundations of SNMP are very simple. It’s the execution! The enterprise specific MIB info, the integration of information into the MIB….it’s [...]

Ever been locked out of the console on an HP ProCurve switch? The switch still operates perfectly, you can still send SNMP set/get’s, but no CLI session…? There are a variety of reasons for this to occur, from having too many open telnet sessions, to a hung console session. You can try sending “break” or [...]

I get many requests from engineers that work with ProCurve devices looking for configs that utilize our HA and load balancing features such as MSTP, VRRP, and OSPF. I’ve posted some core/distribution configs here based on 5400zl’s and edge configs based on 3500yl’s. I’ll be posting more configs soon, as our MSTP implementation is changing [...]

Many of you may have noticed that when a Windows client with 802.1x auth on a wired interface logs off, the 802.1x session does not. This behavior is different from the 802.11 dot1x process which allows seamless transition from machine auth, to user + machine auth, then back to machine auth after a user logs [...]