Cisco CCNP / BCMSN Exam Tutorial: BPDU Skew Detection

You can use this feature the name and think: What is a " BPDU skew, and why I want to identify them? " What we really try to see BPDUs, which are not passed as quickly as they should be .
After the Root Bridge choice of transferring BPDUs Root Bridge and the non-Root-relay switches the BPDU STP down the tree. This should be done to quickly, because the Root bridge is sending a BPDU every two seconds from standard (" hi "), and the switch should the relay BDPUs quickly enough so that all switches to see is a BPDU every two seconds.
That & 39; s in a perfect world, however, and there are many imperfect networks out there! You may have a busy counter, which can not save the CPU on the relay BDPU quickly, or a BPDU May be easy for the transfer lost. The two hi-second time the switch value is not much leeway, but we do not want the new STP topology unnecessarily either.
BDPU skew detection is necessarily a notification feature. Skew Detection will not take measures to prevent STP recalculation if BDPUs will not be relayed fast enough by the switch, but it will be a syslog message to the network administrator about the problem. The time span between the BDPU should have arrived and when they arrive, known as " skew time " or " BPDU latency ".
A employs CPU could quickly find themselves overwhelmed if they had a syslog message for each delivery BPDU that is wrong. The syslog messages will be put on a every 60 seconds, unless the " skew " is time to a critical level. In this case, the Syslog message now with no one per minute limit.
And " what is critical ", BDPU skew detection? Any value greater than 1 / 2 of the maxage value, so that the critical time skew level 10 seconds or greater.
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