Re: [VRRP] 答复: Re: vrrp faster backup

["Stephen Nadas" <[e-mail]>]

Hi, 
 
If I understand the original question properly, the question is how, under expected failure scenarios, can backup take over of the master in less than 3 seconds.  This has been discussed at some length on the mailing list (which you may wish to review) and please see also latest draft: draft-ietf-vrrp-unified-spec-03  which should appear in the repository soon.  The draft discusses this issue.  
 
Regards,
Steve 


________________________________

	From: [e-mail] [mailto:[e-mail]] On Behalf Of [e-mail]
	Sent: Tuesday, July 07, 2009 11:16 AM
	To: Arnab Bakshi
	Cc: [e-mail]
	Subject: [VRRP] 答复: Re: vrrp faster backup
	
	

	Dear Arnab 
	
	Thanks for your feedback. 
	Then when the priority value isn't zero, the Backup Router should waiting the Master Router time out. 
	Are they any other way when priority isn't zero? 
	  
	Best Regards 
	
 


Dash Liu　刘志伟　　　ID: 183475 
Chief Engineer Office, Standard Development and Industry Relations 
  	Product Marketing System 
产品市场体系 
D206, 889, Bibo Road,ZhangJiang, Pudong District, ShangHai P.R.China, 210023
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Arnab Bakshi <[e-mail]> 

2009-07-06 20:52 

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Re: [VRRP] vrrp faster backup

	




	Hi Liu, 
	
	 As per RFC 3768, section 5.3.4 page 12: 
	     The priority value zero (0) has special meaning indicating that the
	    current Master has stopped participating in VRRP.  This is used to
	    trigger Backup routers to quickly transition to Master without having
	    to wait for the current Master to timeout.
	
	This is one way I think if the master router gracefully indicates the other routers in the network. 
	
	Regards 
	Arnab 
	
	2009/7/6 <[e-mail] <mailto:[e-mail]> > 
	
	
	Dear All 
	
	I'm a new comer in IETF. 
	
	VRRP [RFC 3768] specifies an election protocol that dynamically assigns responsibility for a virtual router to one of the VRRP routers on a LAN. 
	This election process provides dynamic fail  over in the forwarding responsibility should the Master become unavailable. 
	   
	The router survivability capability provided by the Virtual Router Redundancy Protocol requirement: (3 * Master_Adver_Interval) + Skew_timer for  Backup Router to declare Masterdown in the VRRP [RFC 3768]. 
	It will be more than 3 second when the Master_Adver_Interval was 1 second. 
	In some LAN environments, the Backup Router needs faster method to declare the Master Router is fail. 
	As if (2 * Master_Adver_Interval) + Skew_timer or (1 * Master_Adver_Interval) + Skew_timer. 
	Are there a message type which permits the Backup Router could backup faster? 
	 
	Best Regards 
 


Dash Liu　刘志伟　　　ID: 183475 
Chief Engineer Office, Standard Development and Industry Relations 
  	Product Marketing System 
产品市场体系 
D206, 889, Bibo Road,ZhangJiang, Pudong District, ShangHai P.R.China, 210023
Tel:[phone]
Mobile:[phone]
Email:[e-mail] <mailto:[e-mail]>  


	
	
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