IOS Recovery from corrupt or missing image from ROMMON Indrodution: hereby i describe how to recover from a corrupt or missing software image on a Cisco Catalyst switch 2900XL and 3500XL. I will show you the steps and 2 examples to load a software image with the hyperterminal software ‘tera term’ or ‘SecureCRT’. If you have a failure to reload or boot up a sw
default interface nexus 5000 tcl script In my latest post i wrote something about vpc double sided configuration with N5k. Due to of refinishing i have to define several ports on the n5k device as port-channels or as access-ports. This ports are used in previous environment for different purposes on the N5k devices. So i have to clear the old port settings and several of them with t
Double-Sided vPC with N5k and Cat6500 1. Introduction Here i want to explain, how to create a double-sided vpc in an enterprise environment. A customer of us want to redeploy his ESX Server connection from active-passive to active-active. In the past the ESX Server were single-sided connected to one of the N5k devices with two 10 Gbit links. The ESX Server were bundled in a p
DHCP Discover Failure in a Port-Channel 1. Introduction Yesterday we stumbled over an absolutely curious phenomenon in association with the DHCP process and a port-channel. With a port-channel the DHCP discovery process fails. Our network design is like cisco enterprise environment commended. There are an access-layer -> distribution layer -> core layer (in direction to the co
Calculate ACL with suitable mask Last week i stumbled over a miracle, how to calculate the appropriate mask for a special ip range. My colleagues and i discussed arp inspection and a strange associated acl setting method. I never ever see a acl like this: I decide to set the mask to 255.255.252.0 for a 22 bit range. My colleagues disagree with my decision and they forced me to expla
Hello together, Last days we created a compendium for ospf and eigrp. our suppose for doing this, is to build a reference book for OSPF and EIGRP. Sometimes you don’t have to do anything for a long time regarding routing at your job. Some features and parameters fall into oblivion. To get in recollection, we create some lines about this subject. Our major topics are….(de
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