Re: [cisco-ttl] loopback

From: Arda Balkanay <wolverard_at_....>
Date: Thu Apr 28 2005 - 00:59:00 EEST

loopback komutu interface'i test etmek amaciyla (hardware test) kullanilir. CSU/DSU cihazi bagli interfaceler de donanimdan kaynakli hatalar olup olmadigini anlamaya yarar.
seri interface encapsulation hdlc iken interface'e ip verip loopback komutunu yuruttugunuzde o interface'e ping atabilirsiniz (cihaz bagli olmasa bile) ve buyuk paketlerle ping attiginizda sh interface serial x ciktisinda input error gorurseniz bu donaniminizda problem oldugu anlamina gelir.

loopback ozelligi daha cok e1 t1 gibi hatlarda troubleshooting yaparken ise yarar, turk telekom israrla hatlarinda bi problem olmadigini sizin santralinizden loop verdigi zaman diger ucu gordugunu soyler, sizde kendi cihazinizdan emin olmak icin kendi routeriniz uzerinde loopback testi yaparsiniz :)

> cevap icin tesekkurler serhat.
>
> aslinda sorum biraz daha farkli. bir musterinin
> bizim taramizdan kontrol edilmeyen Router'i bizim
> NTU ve networkumuz uzerinden baska bir serive
> provider'a (TCL) ulasiyor. biz NTU'yu looplarsak BER
> test calistirabiliyoruz ama loop'u cozdugumuzde hala
> TCL loop goruyordu. sonunda bi sekilde router'dan
> loop'landigi sonucu cikti. kesinlikle ATM port degil
> sadece basit bi 2Mbps hat. bunun uzerine Cisco
> sayfasinda bakarak bazi seyler buldum ama emin
> olamadim. sonra elimde o an baglanabilecegim tek
> router'a baglanarak komutlari incelemek istedim.
> size gonderdigim ise 805 yada 1601'den alinmaydi ve
> komut sadece "loopback" seklindeydi.
>
> ozetlemek gerekirse, ATM olmayan bir router
> interface'i looplamanin nasil olacagini hala bilmek
> isterim
>
> tesekkurler
> tayfun
> ----- Original Message -----
> From: Serhat Uslay
> To: cisco-ttl@yahoogroups.com
> Sent: Wednesday, April 27, 2005 2:00 PM
> Subject: Re: [cisco-ttl] loopback
>
>
>
> normal loopback karsi tarafi looped yapmaz. Ama
> eger interface ATM ise
> "loopback line" komutu karsi taraftan gelen
> trafigin geri yollanmasini
> saglar..
> Burada daha fazla bilgi bulabilirsin (eger daha
> once gormediysen) --->
>
>

http://cisco.com/en/US/customer/tech/tk39/tk48/technologies_tech_note09186a00800c93c4.shtml
>
> Bence HW looplar daha garantili (network loop
> icin) , V35 yada X21
> loopbackini kendin yapabilirsin...
>
>
> Serhat
>
>
>
>
>
>
>
>
>
> ==================================
> Serhat Uslay
> Data Networks Team Leader
> Zurich Financial Services
> Tel; (02) 9995 4945 Cell: 0401 105 485
> Email; serhat.uslay@zurich.com.au
> ==================================
>
>
>
> "Tayfun TUNA" <tayfun.tuna@xtra.co.nz>
> Sent by: cisco-ttl@yahoogroups.com
> 27/04/2005 11:30 AM
> Please respond to
> cisco-ttl@yahoogroups.com
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> To
> cisco-ttl@yahoogroups.com
> cc
>
> Subject
> [cisco-ttl] loopback
>
>
>
>
>
>
>
>
> merhaba,
>
> router uzerindeki loopback komutunun ne yaptigi
> hakkinda bilgisi olan
> var mi. eger loopback router uzerinde set edilirse
> karsi router
> interface "looped" gorunur mu
>
> ROUTER(config)#int s0
> ROUTER(config-if)#loo
> ROUTER(config-if)#loopback
> <cr>
>
> IAS_ROUTER(config-if)#loopback
>
>
> Tayfun
>
>
>
>
>
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Received on Thu Apr 28 00:59:06 2005

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