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Monday, August 30, 2010

Some Internet BGP routers reset neighbors within half an hour last Friday

We know when the BGP neighbor relation resets itself, the network would become disrupted before the new relation re-establishes. In the Intenet BGP scenario, this means a sudden outage of couple of minutes.

This was what happened last Friday (August 27, 2010, from 08:41 to 09:08 UTC)

Wednesday, August 25, 2010

PC attached ports are no exceptions to Spanning Tree Protocol processing

I came across this page on I do not agree with some text mentioned inside.

STP Rule 4—All the other ports in all the switches (VLAN-specific) must be placed in blocking mode. The rule only applies to ports that connect to other bridges or switches. STP does not affect ports that connect to workstations or PCs. These ports remain forwarded.

Friday, August 13, 2010

TCP Denial of Service Vulnerability of Cisco IOS 15.1(2)T

If the IOS version your Cisco Router (or Switch) is 15.1(2)T and exposed publicly on the Internet, you might have to schedule an emergency IOS update this weekend.

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