Author Archives: oldboyscout
Trouble with PoE with linecard WS-X4648-RJ45V+E
There was issue with linecard WS-X4648-RJ45V+E in the 4510 chassis. Without any records in the logs new PoE devices that were attached to the switch on linecard didn`t work (switch did not provide power for them). Furthermore, we turned off\on old device (that still working on this moment) and it did not work too. From … Continue reading
F5 3600 BIG-IP LTM redundancy
I recently tested this balancers (two – cause redundancy). I liked these devices, especially for iRules functionality. But I strongly disappointed about his realisation of redundancy (Active-Standby). If we want to determine what device from redundancy couple should be active, after reboot this “active” device redundancy scheme don’t work correctly. From tests with traffic dump … Continue reading
New Cisco vulnerabilities
A lot of new Cisco vulnerabilities has published recently. Among them few vulnerabilities about IPv6 DDOS. See this – http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_sep11.html
BladeOS
I never see before this OS, it is simple OS for HP blade switches. I used only old version, 5.1 There is 6.3 now. It`s interesting mix from Extreme OS (spanning-tree group, some familiar forms in the command menu) and JunOS (check and aplly config, yes!). Also, it have useful web-interface (oh,miracle!) It is so … Continue reading
Simple IP SLA jitter test
There is simple way to test your channel on jitter with ip sla in Cisco IOS. This test is ideal for testing Internet-connection in the back-office or something like that. If you need check jitter in the voice channel or some tcp-ip server-client connections, you need more complicated decision.
Cisco has began black PR-war against Juniper
Actually, Juniper takes an increasing share of the market and Cisco has no way except start to black-PR company against Juniper. There is url from cisco.com “When you overpromised and Under Deliver, you’ve “junipered”! http://www.overpromisesunderdelivers.net/ Sad, that Cisco did it. But service – it is one of the strongest side of Cisco now. So maybe it has sense. … Continue reading