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Horror spanning-tree

Long time no here not to fast, sorry. Materials sufficient simply hands do not reach.
I'll try not to go for so long.

yet fresh in memory, tell you that we have happened recently (To be exact - the day before yesterday).

Nothing foretold troubles, when port-channel multiple 10GE interfaces (between cat6500 and extreme x650) crashed with the message

 Jan 17 16:07:01.581 marmot:% PM-SP-4-ERR_DISABLE: channel-misconfig error detected on Po2, putting Po2 in err-disable state 

at that the last configuration change that shestitonnika was three days before. Then (after half a minute), he ascended the autorecover and within minutes fell again with the same message. Rebuilding of the port-channel situation has not changed. In debug, too, nothing good.

In search of causes and methods of elimination took about an hour.
As it turned out, One client started to send strange bpdu, and because it was included in the x650, its port bpdu not filtered, and passed on in 6500. And while 6500 was putting port-channel with such strange diagnosis.

discovered the command " no spanning-tree etherchannel guard misconfig ". Specifically, it sha90w I opened it (and at the same time itself). Recommend it to everybody.

Conclusions:
1. STP - evil. If its use is necessary, BPDU to walk only within its own network, and filtered on all client ports on both sides (do not be lazy do it through mac acl, where simpler methods do not). Although even in this case can not be completely calm.
2. Realization of L2 in the Cisco IOS mildly curious.

cite Another example, this time a hypothetical situation illustrates these two conclusions.
For example, we bought a L2-transport from a third party operator, q-in-q. And this statement (At our request or on its own initiative) has prescribed for us Tunneling bpdu, " l2protocol-tunnel stp " at Catalyst. We carefully prescribed bpdufilter on client ports and use stp on this link of the.

And then one of our customers sent us a tunneled bpdu-pack (actually, any multicast packet to the maximum 01:00:0 c: cd: cd: d0). This package passed our bpdufilter, because it is not bpdu, and went to this transport. The local Catalyst tunneling bpdu, detects already tunneled packet. Instead it dropnut, it is something not very clearly says in the log and close the port err-disable, though there are 8 * 10GE and 1000 Wilanow. And did not say in what came to him Wilanow cause such a reaction it package. And this errdisable not disabled.

In fact, we have approximately the same as that in the real case, the day before yesterday: the vulnerability of the activity with the client ports, scarce diagnosis Svicha diagnose the problem and the complexity of manually laying all ports (including port-channel) for a surprising package on the err-disable instead To simply dropnut this package to cisco ios (other vendors for this are not seen).

Somehow when the case will tell more about all sorts of interesting rake in mstp (due to which we now use only the pv-stp).

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How do you say "Curious Varvara's nose torn off in a bazaar»

from school, we all remember that a similar expression in English - « curiosity killed the cat «, t . e. curiosity killed cat. But why a cat and what options there are in other languages?

Image via Wikipedia

expression « curiosity killed the cat » comes from the expression « care killed the cat «, where« care »means" anxiety, sadness. " This form was first published in 1598 in a play by English playwright Ben Jonson « Every Man in His Humour «:

« Helter skelter, hang sorrow, care'll kill a Cat, up-tails all, and a Louse for the Hangman. »

It is believed that this play has played an actor's troupe « The Lord Chamberlain's Men », that included William Shakespeare.

Then He also used the expression in his play "Much Ado About Nothing»:

«What, courage man! what though care killed a cat, thou hast mettle enough in thee to kill care. »

expression« care killed the cat »can be found in Dictionary of Phrase and Fable, 1898:

«Care killed the Cat. It is said that a cat has nine lives, but care would wear them all out. »

centuries, people have felt the lack of curiosity. Baron Don Juan called it a vice. Such an opinion and a well known fact that Cats are sometimes killed because of his curiosity led to the fact that «care» replaced by «curiosity».

There is also the answer to this saying - « satisfaction brought it back «, but the origin this strange answer is unknown.

How did this saying sounds in other languages?

In English : por la boca muere el pez (fish mouth destroyed); la curiosidad mató al gato (curiosity killed the cat)

In French : la curiosité est un vilain défaut (curiosity - bad trait)

In Italian : tanto va la gatta al lardo ... (that something like "and goes for a cat salo »)

And finally. And why do we say "Curious Varvara's nose torn off in a bazaar." It seems to be clear - if suesh nose in his business , it may tear. There is a more detailed explanation:

punishment for theft in Constantinople were quite severe. Wise by bitter experience Byzantines almost did not steal, but foreigners often come across and felt the brunt of the Byzantine laws. For example, for theft in the market, the offender punished by truncation of the nose. Sergei Averintsev ("The Poetics of early Byzantine literature"), half-jokingly, suggested that this was reflected in the famous expression, dozhivshem to the present day - a curious Varvara's nose torn off in a bazaar. " Varvara - meaning "originating from the barbarians."

http://www.lingvaroom.ru/kak-skazat-lyubopytnoj-varvare-na-bazare-nos-otorvali/

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Pour new - to pour old

In my opinion, the ancient Chinese used to say: to pour a new tea, first I must pour out the old one.
very simple and understandable, but how difficult it is to realize to pass through itself and perform ...
In fact, you should not pour the old tea and drink it. And maybe draw all the new goodies?

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