fast switching v.s. cef switching [7:71815]
Can anyone tell me what's the difference between fast switching and cef switching? thanks first! Ellie Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=71905t=71815 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: fast switching v.s. cef switching [7:71815]
Fast switching builds a forwarding cache on the fly, based on the packets that reach the router and need to be switched. CEF builds the cache (CEF table) based on the routing table, independently from the traffic. The fast switching cache does not (necessarily) contain all the information that's in the routing table; it starts out empty and entries are aged out of it later on. Consequently the first packet of every new session going through the router must be process switched, ie. a routing table lookup and cache population need to take place before the packet can be forwarded. The CEF table always contains all the information that the router has access to, it changes (almost) immediately after the router receives a routing update. Thanks, Zsombor At 03:17 AM 7/3/2003 +, wj chou wrote: Can anyone tell me what's the difference between fast switching and cef switching? thanks first! Ellie Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=71831t=71815 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: fast switching v.s. cef switching [7:71815]
Does the CEF cache and Fast Switching cache reside in router memory? And if so what makes CEF faster than Fast Switching? Regards, Jans Fast switching builds a forwarding cache on the fly, based on the packets that reach the router and need to be switched. CEF builds the cache (CEF table) based on the routing table, independently from the traffic. The fast switching cache does not (necessarily) contain all the information that's in the routing table; it starts out empty and entries are aged out of it later on. Consequently the first packet of every new session going through the router must be process switched, ie. a routing table lookup and cache population need to take place before the packet can be forwarded. The CEF table always contains all the information that the router has access to, it changes (almost) immediately after the router receives a routing update. Thanks, Zsombor At 03:17 AM 7/3/2003 +, wj chou wrote: Can anyone tell me what's the difference between fast switching and cef switching? thanks first! Ellie -- Jans van Deventer Phone: (55-61) 361-1466 Fax: (55-61) 234-8722 www.rhox.com.br Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=71839t=71815 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RES: fast switching v.s. cef switching [7:71815]
Besides, load balance in CEF considers origin/destination , whereas Fast Switching only makes load balance by destination . Of course, there is per-packet in both , also. _ Henrique Issamu Terada, CCIE # 7460 IT Support - Open Network CPM S.A. - Tecnologia criando valor Tel.: 55 11 4196-0710 Fax: 55 11 4196-0900 [EMAIL PROTECTED] www.cpm.com.br -- --- Esta mensagem pode conter informagco confidencial e/ou privilegiada. Se vocj nco for o destinatario ou a pessoa autorizada a receber esta mensagem, nco pode usar, copiar ou divulgar as informagues nela contidas ou tomar qualquer agco baseada nessas informagues. Se vocj recebeu esta mensagem por engano, por favor avise imediatamente o remetente, respondendo o e-mail e em seguida apague-o. Agradecemos sua cooperagco. This message may contain confidential and/or privileged information. If you are not the addressee or authorized to receive this for the addressee, you must not use, copy, disclose or take any action based on this message or any information herein. If you have received this message in error, please advise the sender immediately by reply e-mail and delete this message. Thank you for your cooperation. -Mensagem original- De: Zsombor Papp [SMTP:[EMAIL PROTECTED] Enviada em: quinta-feira, 3 de julho de 2003 12:06 Para: [EMAIL PROTECTED] Assunto: Re: fast switching v.s. cef switching [7:71815] Fast switching builds a forwarding cache on the fly, based on the packets that reach the router and need to be switched. CEF builds the cache (CEF table) based on the routing table, independently from the traffic. The fast switching cache does not (necessarily) contain all the information that's in the routing table; it starts out empty and entries are aged out of it later on. Consequently the first packet of every new session going through the router must be process switched, ie. a routing table lookup and cache population need to take place before the packet can be forwarded. The CEF table always contains all the information that the router has access to, it changes (almost) immediately after the router receives a routing update. Thanks, Zsombor At 03:17 AM 7/3/2003 +, wj chou wrote: Can anyone tell me what's the difference between fast switching and cef switching? thanks first! Ellie Incoming mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.495 / Virus Database: 294 - Release Date: 30/06/2003 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.495 / Virus Database: 294 - Release Date: 30/06/2003 Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=71840t=71815 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: fast switching v.s. cef switching [7:71815]
Zsombor explained it pretty well but if you want more detail: http://www.cisco.com/en/US/customer/tech/tk827/tk831/technologies_white_paper09186a00800a62d9.shtml#express Dave Jans van Deventer wrote: Does the CEF cache and Fast Switching cache reside in router memory? And if so what makes CEF faster than Fast Switching? Regards, Jans Fast switching builds a forwarding cache on the fly, based on the packets that reach the router and need to be switched. CEF builds the cache (CEF table) based on the routing table, independently from the traffic. The fast switching cache does not (necessarily) contain all the information that's in the routing table; it starts out empty and entries are aged out of it later on. Consequently the first packet of every new session going through the router must be process switched, ie. a routing table lookup and cache population need to take place before the packet can be forwarded. The CEF table always contains all the information that the router has access to, it changes (almost) immediately after the router receives a routing update. Thanks, Zsombor At 03:17 AM 7/3/2003 +, wj chou wrote: Can anyone tell me what's the difference between fast switching and cef switching? thanks first! Ellie -- David Madland CCIE# 2016 Sr. Network Engineer Qwest Communications 612-664-3367 Government can do something for the people only in proportion as it can do something to the people. -- Thomas Jefferson Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=71844t=71815 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: RES: fast switching v.s. cef switching [7:71815]
Henrique Issamu Terada wrote: Besides, load balance in CEF considers origin/destination , whereas Fast Switching only makes load balance by destination . Of course, there is per-packet in both , also. Actually, there is no per-packet load balancing in fast switching. The only way to get it is to disable route caching completely, forcing process switching, or use CEF and 'ip load-sharing per-packet'. Regards, Marco. Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=71842t=71815 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: fast switching v.s. cef switching [7:71815]
At 04:37 PM 7/3/2003 +, Jans van Deventer wrote: Does the CEF cache and Fast Switching cache reside in router memory? Yes. And if so what makes CEF faster than Fast Switching? The cache structure is more efficient. Thanks, Zsombor Regards, Jans Fast switching builds a forwarding cache on the fly, based on the packets that reach the router and need to be switched. CEF builds the cache (CEF table) based on the routing table, independently from the traffic. The fast switching cache does not (necessarily) contain all the information that's in the routing table; it starts out empty and entries are aged out of it later on. Consequently the first packet of every new session going through the router must be process switched, ie. a routing table lookup and cache population need to take place before the packet can be forwarded. The CEF table always contains all the information that the router has access to, it changes (almost) immediately after the router receives a routing update. Thanks, Zsombor At 03:17 AM 7/3/2003 +, wj chou wrote: Can anyone tell me what's the difference between fast switching and cef switching? thanks first! Ellie -- Jans van Deventer Phone: (55-61) 361-1466 Fax: (55-61) 234-8722 www.rhox.com.br Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=71847t=71815 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
fast switching v.s. cef switching [7:71815]
Can anyone tell me what's the difference between fast switching and cef switching? thanks first! Ellie Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=71815t=71815 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
