{"id":37847,"date":"2019-10-31T22:20:09","date_gmt":"2019-10-31T19:20:09","guid":{"rendered":"https:\/\/prohoster.info\/blog\/kak-ya-proektiruyu-sks\/"},"modified":"2019-10-31T22:20:09","modified_gmt":"2019-10-31T19:20:09","slug":"kak-ya-proektiruyu-sks","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/administrirovanie\/kak-ya-proektiruyu-sks","title":{"rendered":"Jak navrhuji SMI","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Jak navrhuji SMI\" src=\"\/wp-content\/uploads\/2019\/09\/4e4cedd8aba80c4cafa9bda3a9c418c2.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nTento \u010dl\u00e1nek vznikl jako reakce na \u010dl\u00e1nek <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/465819\/\">\u201eIde\u00e1ln\u00ed lok\u00e1ln\u00ed s\u00ed\u0165\u201c<\/a><\/noindex>. Nesouhlas\u00edm s v\u011bt\u0161inou tez\u00ed autora a chci v tomto \u010dl\u00e1nku nejen je vyvr\u00e1tit, ale tak\u00e9 p\u0159edlo\u017eit sv\u00e9 vlastn\u00ed teze, kter\u00e9 pot\u00e9 obh\u00e1j\u00edm v koment\u00e1\u0159\u00edch. D\u00e1le se pod\u011bl\u00edm o n\u011bkolik princip\u016f, kter\u00fdmi se \u0159\u00edd\u00edm p\u0159i navrhov\u00e1n\u00ed lok\u00e1ln\u00ed s\u00edt\u011b jak\u00e9hokoli podniku.<\/p>\n<p>Prvn\u00edm principem je spolehlivost. Nespolehliv\u00e1 s\u00ed\u0165 v\u017edy vyjde dr\u00e1\u017e d\u00edky n\u00e1klad\u016fm na jej\u00ed \u00fadr\u017ebu, ztr\u00e1t\u00e1m p\u0159i v\u00fdpadc\u00edch a ztr\u00e1t\u00e1m od vn\u011bj\u0161\u00edch z\u00e1sah\u016f. Na z\u00e1klad\u011b tohoto principu navrhuji hlavn\u00ed s\u00ed\u0165 v\u017edy pouze jako dr\u00e1tovou a p\u0159i pot\u0159eb\u011b dodate\u010dn\u011b bezdr\u00e1tovou (hostitelskou s\u00ed\u0165 nebo s\u00ed\u0165 pro mobiln\u00ed termin\u00e1ly). Pro\u010d je bezdr\u00e1tov\u00e1 s\u00ed\u0165 m\u00e9n\u011b spolehliv\u00e1? Ka\u017ed\u00e1 bezdr\u00e1tov\u00e1 s\u00ed\u0165 m\u00e1 \u0159adu probl\u00e9m\u016f s bezpe\u010dnost\u00ed, stabilitou a kompatibilitou. P\u0159\u00edli\u0161 mnoho rizik pro v\u00e1\u017enou spole\u010dnost. <noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>Spolehlivost ur\u010duje i strukturu s\u00edt\u011b. Topologie \u201eHv\u011bzda\u201c je ide\u00e1l, kter\u00e9mu je t\u0159eba se sna\u017eit p\u0159ibl\u00ed\u017eit. \u201eHv\u011bzda\u201c zkracuje nezbytn\u00fd po\u010det switch\u016f, sni\u017euje mno\u017estv\u00ed zraniteln\u00fdch trunkov\u00fdch linek a zjednodu\u0161uje \u00fadr\u017ebu. O kolik snaz\u0161\u00ed je hledat probl\u00e9m v jednom switche ne\u017e v n\u011bkolika rozpt\u00fdlen\u00fdch po kancel\u00e1\u0159\u00edch, jak navrhuje autor v\u00fd\u0161e uveden\u00e9ho \u010dl\u00e1nku. Nen\u00ed divu, \u017ee se pou\u017e\u00edv\u00e1 fr\u00e1ze \u201ezoo switch\u016f\u201c.<\/p>\n<p>Ale \u010dasto je v praxi nutn\u00e9 pou\u017e\u00edvat bu\u010f topologii \u201efrakt\u00e1ln\u00ed hv\u011bzda\u201c, nebo \u201esm\u00ed\u0161enou topologii\u201c. To souvis\u00ed s omezen\u00edm vzd\u00e1lenosti mezi komunika\u010dn\u00edm za\u0159\u00edzen\u00edm a pracovn\u00ed stanic\u00ed. Proto v\u011b\u0159\u00edm, \u017ee optick\u00e9 s\u00edt\u011b \u010dasem pln\u011b nahrad\u00ed kroucen\u00e9 p\u00e1ry.<\/p>\n<p><img decoding=\"async\" alt=\"Jak navrhuji SMI\" src=\"\/wp-content\/uploads\/2019\/09\/262b602494395f625d54c017e0fa82a3.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nPokud nen\u00ed mo\u017en\u00e9 um\u00edstit v\u0161echny switche na jedno m\u00edsto, doporu\u010duje se pou\u017e\u00edvat sm\u00ed\u0161enou topologii, proto\u017ee v\u0161echny trunky p\u016fjdou r\u016fzn\u00fdmi trasami, co\u017e minimalizuje pravd\u011bpodobnost sou\u010dasn\u00e9ho po\u0161kozen\u00ed n\u011bkolika magistr\u00e1l. <\/p>\n<p>Pokud jde o trunky. P\u0159ep\u00edna\u010de propojen\u00e9 trunkov\u00fdmi linkami by m\u011bly m\u00edt v\u017edy z\u00e1lo\u017en\u00ed kan\u00e1l, aby v p\u0159\u00edpad\u011b po\u0161kozen\u00ed jedn\u00e9 linky z\u016fstala komunikace mezi uzly zachov\u00e1na a \u017e\u00e1dn\u00e9 spojen\u00ed nebylo p\u0159eru\u0161eno. Po\u0161kozen\u00fd kabel lze tedy p\u0159et\u00e1hnout bez sp\u011bchu. Proto lze pro trunky, i na kr\u00e1tk\u00fdch vzd\u00e1lenostech, pou\u017e\u00edt rychlej\u0161\u00ed a ten\u010d\u00ed optick\u00fd patch cord.<\/p>\n<p>Druh\u00fd princip v\u00fdstavby strukturovan\u00e9 kabel\u00e1\u017ee je racionalita a prakti\u010dnost. Pr\u00e1v\u011b racionalita br\u00e1n\u00ed pou\u017eit\u00ed \u201emodern\u00ed\u201c optiky p\u0159i p\u0159ipojov\u00e1n\u00ed pracovn\u00edch stanic a dal\u0161\u00edch za\u0159\u00edzen\u00ed s\u00edt\u011b. Jak spr\u00e1vn\u011b poznamenal autor v\u00fd\u0161e zm\u00edn\u011bn\u00e9ho \u010dl\u00e1nku \u2013 na twisted pair v sou\u010dasnosti funguje v\u0161e. To je velmi praktick\u00e9. Na optick\u00fdch kan\u00e1lech v\u0161ak bez dal\u0161\u00edch za\u0159\u00edzen\u00ed m\u00e1lo co zat\u00edm m\u016f\u017ee fungovat. A ka\u017ed\u00e9 dal\u0161\u00ed za\u0159\u00edzen\u00ed je nejen zranitelnost\u00ed, ale i dodate\u010dn\u00fdmi n\u00e1klady. P\u0159esto je v tom budoucnost. Kdykoliv, kdy t\u00e9m\u011b\u0159 ka\u017ed\u00e9 za\u0159\u00edzen\u00ed bude m\u00edt vestav\u011bn\u00fd optick\u00fd port, optika zcela nahrad\u00ed twisted pair. <\/p>\n<p>Racionalita a prakti\u010dnost se mohou projevovat i v po\u010dtu z\u00e1suvek RJ45 na pracovn\u00edm m\u00edst\u011b. Je praktick\u00e9 pou\u017e\u00edvat 2 z\u00e1suvky na m\u00edsto. Druh\u00e1 linka m\u016f\u017ee b\u00fdt nap\u0159\u00edklad pou\u017eita pro p\u0159ipojen\u00ed analogov\u00e9ho (digit\u00e1ln\u00edho) telefonu nebo jednodu\u0161e jako z\u00e1lo\u017en\u00ed. Takto se obvykle navrhuje strukturovan\u00e1 kabel\u00e1\u017e pro velk\u00e9 spole\u010dnosti. Pro mal\u00e9 a st\u0159edn\u00ed podniky je racion\u00e1ln\u011bj\u0161\u00ed pou\u017e\u00edvat jednu po\u010d\u00edta\u010dovou z\u00e1suvku na pracovn\u00ed m\u00edsto, proto\u017ee IP telefony obvykle maj\u00ed dva porty \u2013 p\u0159\u00edchoz\u00ed linku a druh\u00fd pro p\u0159ipojen\u00ed po\u010d\u00edta\u010de. Pro s\u00ed\u0165ov\u00e9 tisk\u00e1rny je v\u017edy \u017e\u00e1douc\u00ed navrhovat samostatn\u00e9 pracovn\u00ed m\u00edsto a um\u00edstit je, pokud mo\u017eno, pohodln\u011b pro v\u0161echny, kte\u0159\u00ed je pou\u017e\u00edvaj\u00ed, nap\u0159\u00edklad na chodb\u00e1ch. Rozhodnout, co je d\u016fle\u017eit\u011bj\u0161\u00ed \u2013 racionalita nebo prakti\u010dnost, by m\u011bl kompetentn\u00ed \u010dlov\u011bk v IT oblasti, jak v\u0161ichni dob\u0159e v\u00edme, \u017ee obvykle vyb\u00edr\u00e1 veden\u00ed.<\/p>\n<p>Existuje je\u0161t\u011b jedna d\u016fle\u017eit\u00e1 v\u011bc, kterou bych za\u0159adil k racionalit\u011b a prakti\u010dnosti. Je to rozumn\u00e1 nadbyte\u010dnost. Je prakti\u010dt\u011bj\u0161\u00ed m\u00edt v kancel\u00e1\u0159\u00edch tolik pracovn\u00edch m\u00edst, kolik m\u016f\u017ee pojmout zam\u011bstnanc\u016f, ne\u017e kolik jich tam aktu\u00e1ln\u011b pracuje. Op\u011bt by m\u011bl rozhodovat kompetentn\u00ed zam\u011bstnanec, kter\u00fd m\u00e1 p\u0159edstavu o finan\u010dn\u00edch mo\u017enostech firmy a ch\u00e1pe, \u017ee v p\u0159\u00edpad\u011b nov\u00fdch po\u017eadavk\u016f bude muset vy\u0159e\u0161it probl\u00e9m nedostatku m\u00edst.<\/p>\n<p>Samoz\u0159ejm\u011b, \u017ee k principu racionality a prakti\u010dnosti pat\u0159\u00ed tak\u00e9 v\u00fdb\u011br za\u0159\u00edzen\u00ed a materi\u00e1l\u016f. Nap\u0159\u00edklad pokud je firma mal\u00e1 a nem\u00e1 mo\u017enost m\u00edt kvalifikovan\u00e9ho s\u00ed\u0165ov\u00e9ho administr\u00e1tora, kter\u00fd by um\u011bl pracovat s L2 p\u0159ep\u00edna\u010di, m\u00e1 smysl pou\u017e\u00edt ne\u0159\u00edzen\u00e9 p\u0159ep\u00edna\u010de, za p\u0159edpokladu, \u017ee rezervn\u00ed trasy budou existovat, by\u0165 neaktivn\u00ed. Na materi\u00e1lech se \u0161et\u0159it nesm\u00ed. Pou\u017e\u00edt m\u00edsto m\u011bd\u011bn\u00e9 to\u010den\u00e9 p\u00e1ru m\u011bd\u011bnou ocel, znamen\u00e1 zaru\u010den\u011b se za p\u00e1r let pot\u00fdkat s probl\u00e9mem \u0161patn\u00fdch spojen\u00ed. Vzd\u00e1t se patch panel\u016f, v\u00fdrobn\u00edch patchcord\u016f a organiz\u00e9r\u016f, znamen\u00e1 po n\u011bjak\u00e9m \u010dase dostat chaos ve sk\u0159\u00edni, neust\u00e1le \u201eodpad\u00e1vaj\u00edc\u00ed\u201c linky a oxidaci konektor\u016f. Stejn\u011b tak se nevyplat\u00ed \u0161et\u0159it na serverov\u00e9m racku. Velikost ne pouze umo\u017en\u00ed um\u00edstit do n\u011bj v\u00edce za\u0159\u00edzen\u00ed, ale tak\u00e9 usnadn\u00ed jeho \u00fadr\u017ebu. <\/p>\n<p>Ne\u0161et\u0159ete na patchcordech. Kvalitn\u00ed v\u00fdrobn\u00ed patchcordy by m\u011bly b\u00fdt jak na pracovn\u00edch m\u00edstech, tak v serverov\u00e9m racku. Pokud spo\u010d\u00edt\u00e1me \u010das str\u00e1ven\u00fd na lisov\u00e1n\u00ed konektor\u016f a n\u00e1klady na materi\u00e1ly, bude levn\u011bj\u0161\u00ed koupit v\u00fdrobn\u00ed patchcord. Krom\u011b toho bude kabel tu\u017e\u0161\u00ed, konektory mohou b\u00fdt nekvalitn\u00ed, konektory se mnohem rychleji oxiduj\u00ed, lisovac\u00ed n\u00e1stroj m\u016f\u017ee b\u00fdt nekvalitn\u00ed, o\u010di se mohou unavit a je zde je\u0161t\u011b mnoho dal\u0161\u00edch d\u016fvod\u016f, pro\u010d nepou\u017e\u00edvat vlastn\u00ed patchcord. <\/p>\n<p>Podle m\u00e9ho n\u00e1zoru, pokud nen\u00ed pot\u0159eba, aby pracovn\u00ed stanice fungovala na rychlostech 10G, je rozumn\u011bj\u0161\u00ed pou\u017e\u00edvat to\u010denou p\u00e1ru kategorie 5e ne\u017e 6, proto\u017ee je nejen levn\u011bj\u0161\u00ed, ale tak\u00e9 ten\u010d\u00ed, pru\u017en\u011bj\u0161\u00ed, co\u017e usnad\u0148uje instalaci. <\/p>\n<p>A nakonec t\u0159et\u00ed princip \u2014 to je uspo\u0159\u00e1danost. \u010c\u00edm v\u011bt\u0161\u00ed je s\u00ed\u0165, t\u00edm d\u016fle\u017eit\u011bj\u0161\u00ed je po\u0159\u00e1dek v n\u00ed. Z\u00e1suvky a porty patch panel\u016f by m\u011bly b\u00fdt v\u017edy o\u010d\u00edslov\u00e1ny. \u010c\u00edsla obvykle za\u010d\u00ednaj\u00ed podle pracovn\u00edch m\u00edst zleva doprava od vstupu do m\u00edstnosti. Mus\u00ed b\u00fdt schv\u00e1len\u00fd pl\u00e1n prostor s um\u00edst\u011bn\u00edm a \u010d\u00edslov\u00e1n\u00edm z\u00e1suvek.<br \/>\nPr\u00e1v\u011b pro uspo\u0159\u00e1danost a ne pro fyzick\u00e9 odd\u011blen\u00ed s\u00edt\u00ed se pou\u017e\u00edvaj\u00ed patch panely. Pokud autor \u201eji\u017e zm\u00edn\u011bn\u00e9ho\u201c \u010dl\u00e1nku p\u0159edpokl\u00e1d\u00e1, \u017ee v jeho sk\u0159\u00edni nen\u00ed co spojovat, my si to dovolit nem\u016f\u017eeme. <\/p>\n<p>A to je v\u0161e. Tyto t\u0159i z\u00e1kladn\u00ed principy ur\u010duj\u00ed ka\u017ed\u00fd m\u016fj projekt SCS. V tomto \u010dl\u00e1nku jsem nemohl pokr\u00fdt v\u0161echno, mnoh\u00e9 jsem pravd\u011bpodobn\u011b opomn\u011bl, n\u011bkde mo\u017en\u00e1 chyboval. Jsem v\u017edy otev\u0159en konstruktivn\u00ed diskusi, pokud mi bude zasl\u00e1no pozv\u00e1n\u00ed nebo v osobn\u00ed korespondenci.<br \/>\n<br \/>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/466307\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u042d\u0442\u0430 \u0441\u0442\u0430\u0442\u044c\u044f \u0440\u043e\u0434\u0438\u043b\u0430\u0441\u044c \u0432 \u043e\u0442\u0432\u0435\u0442 \u043d\u0430 \u0441\u0442\u0430\u0442\u044c\u044e \u00ab\u0418\u0434\u0435\u0430\u043b\u044c\u043d\u0430\u044f \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u0430\u044f \u0441\u0435\u0442\u044c\u00bb. \u042f \u043d\u0435 \u0441\u043e\u0433\u043b\u0430\u0441\u0435\u043d \u0441 \u0431\u043e\u043b\u044c\u0448\u0438\u043d\u0441\u0442\u0432\u043e\u043c \u0442\u0435\u0437\u0438\u0441\u043e\u0432 \u0430\u0432\u0442\u043e\u0440\u0430, \u0438 \u0445\u043e\u0447\u0443 \u0432 \u044d\u0442\u043e\u0439 \u0441\u0442\u0430\u0442\u044c\u0435 \u043d\u0435 \u0442\u043e\u043b\u044c\u043a\u043e \u0438\u0445 \u043e\u043f\u0440\u043e\u0432\u0435\u0440\u0433\u043d\u0443\u0442\u044c, \u043d\u043e \u0438 \u0432\u044b\u0434\u0432\u0438\u043d\u0443\u0442\u044c \u0441\u0432\u043e\u0438 \u0442\u0435\u0437\u0438\u0441\u044b, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043f\u043e\u0442\u043e\u043c \u0431\u0443\u0434\u0443 \u0437\u0430\u0449\u0438\u0449\u0430\u0442\u044c \u0432 \u043a\u043e\u043c\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u044f\u0445. \u0414\u0430\u043b\u0435\u0435 \u044f \u0440\u0430\u0441\u0441\u043a\u0430\u0436\u0443 \u043e \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u0438\u0445 \u043f\u0440\u0438\u043d\u0446\u0438\u043f\u0430\u0445, \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u044f \u043f\u0440\u0438\u0434\u0435\u0440\u0436\u0438\u0432\u0430\u044e\u0441\u044c \u043f\u0440\u0438 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