Re: vrrp Digest, Vol 81, Issue 3
"Anurag Kothari (ankothar)" <[email protected]> Mon, 25 Feb 2013 16:24:44 +0000
| Newsgroups | gmane.ietf.vrrp |
|---|---|
| Message-ID | <[email protected]> |
--===============7842514329606952683== Content-Language: en-US Content-Type: multipart/related; boundary="_004_A2BB90B33FFDF740876C5AAE307D83DB1C293D07xmbrcdx05ciscoc_"; type="multipart/alternative" --_004_A2BB90B33FFDF740876C5AAE307D83DB1C293D07xmbrcdx05ciscoc_ Content-Type: multipart/alternative; boundary="_000_A2BB90B33FFDF740876C5AAE307D83DB1C293D07xmbrcdx05ciscoc_" --_000_A2BB90B33FFDF740876C5AAE307D83DB1C293D07xmbrcdx05ciscoc_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Thirumavalavan Yes the priority zero router will become backup on receiving the ADVERTISEM= ENT from other router which would have transitioned to Master. Thanks -Anurag From: Thirumavalavan Periyannan [mailto:[email protected]] Sent: Monday, February 25, 2013 11:19 AM To: Anurag Kothari (ankothar); [email protected] Subject: RE: [VRRP] vrrp Digest, Vol 81, Issue 3 Yes Anurag, I agree that backup router will reset Master_Down_timer value a= s Skew_Time and It will be become master when Master_Down_timer fired and will send VRRP Ad= vertisements with their own priority. After VRRP Master elected, What could be the VRRP state of priority ZERO co= nfigured router? Is it Backup? Thanks & Regards, Thirumavalavan Periyannan Associate SQA Engineer - VRRP Module Owner [cid:[email protected]] From: Anurag Kothari (ankothar) [mailto:[email protected]] Sent: Monday, February 25, 2013 8:44 PM To: Thirumavalavan Periyannan; [email protected]<mailto:[email protected]> Subject: RE: [VRRP] vrrp Digest, Vol 81, Issue 3 Hi Thirumavalavan The Master_Down_Timer is set to Skew_Time by the backup router on receiving= an ADVERTISEMENT with Priority =3D 0. That is why I said will have to wait= Skew_Time in the thread below. I am copy pasting the relevant section from= the RFC for easy reference: (420) - If an ADVERTISEMENT is received, then: (425) + If the Priority in the ADVERTISEMENT is zero, then: (430) * Set the Master_Down_Timer to Skew_Time (440) + else // priority non-zero Yes the Priority on the Master router will have to be set to zero to initia= te a graceful failover. Thanks -Anurag From: Thirumavalavan Periyannan [mailto:[email protected]] Sent: Monday, February 25, 2013 10:08 AM To: Anurag Kothari (ankothar); [email protected]<mailto:[email protected]> Subject: RE: [VRRP] vrrp Digest, Vol 81, Issue 3 Hi Anurag, Sorry for the late response. See the inline [Thiru] Here, I have a question, 1.Do We have to configure priority Zero on Master router to do graceful fai= lover? Thanks & Regards, Thirumavalavan Periyannan Associate SQA Engineer - VRRP Module Owner [Description: Description: Description: Description: Description: Descripti= on: Description: Description: cid:[email protected]] -----Original Message----- From: Anurag Kothari (ankothar) [mailto:[email protected]] Sent: Saturday, February 23, 2013 12:57 AM To: Thirumavalavan Periyannan; [email protected]<mailto:[email protected]> Cc: Peter Hunt Subject: RE: [VRRP] vrrp Digest, Vol 81, Issue 3 Hi Thirumavalavan Here are couple of points: 1) With something like "disable vrrp" or "shutdown vrrp" it will not be gra= ceful as the router will treat it as a shutdown event (which is a break bef= ore you make approach) and the router will "Transition to the {Initialize} = state". The backup router will wait for "Skew_Time"[Thiru]I think, it's Mas= ter_Down_interval time. before it becomes master; So we probably will have = traffic loss for a period approximately equal to "Skew_Time"[Thiru]I think,= it's Master_Down_interval time. Even with Default configuration this will = be close to 609 ms which would be a duration long enough for to impact time= sensitive applications (e.g. voice calls). For sure the actual failover ti= me will depend upon the size of the Network and the switches in between but= with the method proposed below we can try to improve that time. 2) This will also improve convergence in scenarios where we want the failov= er to trigger because of up uplink interface from the router going down (tr= acking interface and decrementing the priority). I am not sure if you saw the modified proposal which was sent out today ear= ly morning. Here is the link to it in case you need it http://www.ietf.org/= mail-archive/web/vrrp/current/msg01489.html Thanks ~Anurag ________________________________ DISCLAIMER: This e-mail and any attachments to it may contain confidential and propriet= ary material and is solely for the use of the intended recipient. Any revie= w, use, disclosure, distribution or copying of this transmittal is prohibit= ed except by or on behalf of the intended recipient. If you have received t= his transmittal in error, please notify the sender and destroy this e-mail = and any attachments and all copies, whether electronic or printed. ________________________________ DISCLAIMER: This e-mail and any attachments to it may contain confidential and propriet= ary material and is solely for the use of the intended recipient. Any revie= w, use, disclosure, distribution or copying of this transmittal is prohibit= ed except by or on behalf of the intended recipient. If you have received t= his transmittal in error, please notify the sender and destroy this e-mail = and any attachments and all copies, whether electronic or printed. --_000_A2BB90B33FFDF740876C5AAE307D83DB1C293D07xmbrcdx05ciscoc_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable <html xmlns:v=3D"urn:schemas-microsoft-com:vml" xmlns:o=3D"urn:schemas-micr= osoft-com:office:office" xmlns:w=3D"urn:schemas-microsoft-com:office:word" = xmlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml" xmlns=3D"http:= //www.w3.org/TR/REC-html40"> <head> <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"= > <meta name=3D"Generator" content=3D"Microsoft Word 14 (filtered medium)"> <!--[if !mso]><style>v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} </style><![endif]--><style><!-- /* Font Definitions */ @font-face {font-family:Calibri; panose-1:2 15 5 2 2 2 4 3 2 4;} @font-face {font-family:Tahoma; panose-1:2 11 6 4 3 5 4 4 2 4;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {margin:0in; margin-bottom:.0001pt; font-size:11.0pt; font-family:"Calibri","sans-serif";} a:link, span.MsoHyperlink {mso-style-priority:99; color:blue; text-decoration:underline;} a:visited, span.MsoHyperlinkFollowed {mso-style-priority:99; color:purple; text-decoration:underline;} p.MsoPlainText, li.MsoPlainText, div.MsoPlainText {mso-style-priority:99; mso-style-link:"Plain Text Char"; margin:0in; margin-bottom:.0001pt; font-size:11.0pt; font-family:"Courier New"; color:#0606BA;} p.MsoAcetate, li.MsoAcetate, div.MsoAcetate {mso-style-priority:99; mso-style-link:"Balloon Text Char"; margin:0in; margin-bottom:.0001pt; font-size:8.0pt; font-family:"Tahoma","sans-serif";} span.PlainTextChar {mso-style-name:"Plain Text Char"; mso-style-priority:99; mso-style-link:"Plain Text"; font-family:"Courier New"; color:#0606BA;} span.BalloonTextChar {mso-style-name:"Balloon Text Char"; mso-style-priority:99; mso-style-link:"Balloon Text"; font-family:"Tahoma","sans-serif";} span.EmailStyle21 {mso-style-type:personal; font-family:"Courier New"; color:black;} span.EmailStyle22 {mso-style-type:personal; font-family:"Calibri","sans-serif"; color:#1F497D;} span.EmailStyle23 {mso-style-type:personal; font-family:"Courier New"; color:black;} span.EmailStyle24 {mso-style-type:personal-reply; font-family:"Calibri","sans-serif"; color:#1F497D;} .MsoChpDefault {mso-style-type:export-only; font-size:10.0pt;} @page WordSection1 {size:8.5in 11.0in; margin:1.0in 1.0in 1.0in 1.0in;} div.WordSection1 {page:WordSection1;} --></style><!--[if gte mso 9]><xml> <o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" /> </xml><![endif]--><!--[if gte mso 9]><xml> <o:shapelayout v:ext=3D"edit"> <o:idmap v:ext=3D"edit" data=3D"1" /> </o:shapelayout></xml><![endif]--> </head> <body lang=3D"EN-US" link=3D"blue" vlink=3D"purple"> <div class=3D"WordSection1"> <p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi Thirumavalavan<o:p>= </o:p></span></p> <p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p> </o:p></spa= n></p> <p class=3D"MsoNormal"><span style=3D"color:#1F497D">Yes the priority zero = router will become backup on receiving the ADVERTISEMENT from other router = which would have transitioned to Master.<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p> </o:p></spa= n></p> <p class=3D"MsoNormal"><span style=3D"color:#1F497D">Thanks<o:p></o:p></spa= n></p> <p class=3D"MsoNormal"><span style=3D"color:#1F497D">-Anurag</span><span st= yle=3D"color:#1F497D"><o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p> </o:p></spa= n></p> <div> <div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in = 0in 0in"> <p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:"= ;Tahoma","sans-serif"">From:</span></b><span style=3D"font-s= ize:10.0pt;font-family:"Tahoma","sans-serif""> Thirumav= alavan Periyannan [mailto:[email protected]] <br> <b>Sent:</b> Monday, February 25, 2013 11:19 AM<br> <b>To:</b> Anurag Kothari (ankothar); [email protected]<br> <b>Subject:</b> RE: [VRRP] vrrp Digest, Vol 81, Issue 3<o:p></o:p></span></= p> </div> </div> <p class=3D"MsoNormal"><o:p> </o:p></p> <p class=3D"MsoNormal"><span style=3D"font-family:"Courier New";c= olor:black">Yes Anurag, I agree that backup router will reset Master_Down_t= imer value as Skew_Time and <o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-family:"Courier New";c= olor:black">It will be become master when Master_Down_timer fired and will = send VRRP Advertisements with their own priority.<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-family:"Courier New";c= olor:black"><o:p> </o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-family:"Courier New";c= olor:black">After VRRP Master elected, What could be the VRRP state of prio= rity ZERO configured router? Is it Backup?<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-family:"Courier New";c= olor:black"><o:p> </o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Thank= s & Regards,<o:p></o:p></span></p> <p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;color:#1F497D">Th= irumavalavan Periyannan</span></b><span style=3D"font-size:10.0pt;color:#1F= 497D"><o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Assoc= iate SQA Engineer - VRRP Module Owner<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>= </o:p></span></p> <p class=3D"MsoNormal"><b><span style=3D"color:#4A442A"><img width=3D"188" = height=3D"65" id=3D"_x0000_i1025" src=3D"cid:[email protected]= "></span></b><span style=3D"color:#1F497D"><o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-family:"Courier New";c= olor:black"><o:p> </o:p></span></p> <div> <div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in = 0in 0in"> <p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:"= ;Tahoma","sans-serif"">From:</span></b><span style=3D"font-s= ize:10.0pt;font-family:"Tahoma","sans-serif""> Anurag K= othari (ankothar) [<a href=3D"mailto:[email protected]">mailto:ankothar@ci= sco.com</a>] <br> <b>Sent:</b> Monday, February 25, 2013 8:44 PM<br> <b>To:</b> Thirumavalavan Periyannan; <a href=3D"mailto:[email protected]">vrrp= @ietf.org</a><br> <b>Subject:</b> RE: [VRRP] vrrp Digest, Vol 81, Issue 3<o:p></o:p></span></= p> </div> </div> <p class=3D"MsoNormal"><o:p> </o:p></p> <p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi Thirumavalavan<o:p>= </o:p></span></p> <p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p> </o:p></spa= n></p> <p class=3D"MsoNormal"><span style=3D"color:#1F497D">The Master_Down_Timer = is set to Skew_Time by the backup router on receiving an ADVERTISEMENT with= Priority =3D 0. That is why I said will have to wait Skew_Time in the thre= ad below. I am copy pasting the relevant section from the RFC for easy reference:<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p> </o:p></spa= n></p> <p class=3D"MsoNormal"><span style=3D"font-family:"Courier New"">= (420) - If an ADVERTISEMENT is received, then:<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-family:"Courier New"">= <o:p> </o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-family:"Courier New"">= (425) + If the Priority in the ADVERTISEMENT is zero, then= :<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-family:"Courier New"">= <o:p> </o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-family:"Courier New"">= (430) * Set the Master_Down_Timer to Skew_Ti= me<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-family:"Courier New"">= <o:p> </o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-family:"Courier New"">= (440) + else // priority non-zero<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p> </o:p></spa= n></p> <p class=3D"MsoNormal"><span style=3D"color:#1F497D">Yes the Priority on th= e Master router will have to be set to zero to initiate a graceful failover= .<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p> </o:p></spa= n></p> <p class=3D"MsoNormal"><span style=3D"color:#1F497D">Thanks<o:p></o:p></spa= n></p> <p class=3D"MsoNormal"><span style=3D"color:#1F497D">-Anurag<o:p></o:p></sp= an></p> <p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p> </o:p></spa= n></p> <div> <div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in = 0in 0in"> <p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:"= ;Tahoma","sans-serif"">From:</span></b><span style=3D"font-s= ize:10.0pt;font-family:"Tahoma","sans-serif""> Thirumav= alavan Periyannan [<a href=3D"mailto:[email protected]">mailt= o:[email protected]</a>] <br> <b>Sent:</b> Monday, February 25, 2013 10:08 AM<br> <b>To:</b> Anurag Kothari (ankothar); <a href=3D"mailto:[email protected]">vrrp= @ietf.org</a><br> <b>Subject:</b> RE: [VRRP] vrrp Digest, Vol 81, Issue 3<o:p></o:p></span></= p> </div> </div> <p class=3D"MsoNormal"><o:p> </o:p></p> <p class=3D"MsoNormal"><o:p> </o:p></p> <p class=3D"MsoPlainText"><span style=3D"color:#17375E">Hi Anurag,<o:p></o:= p></span></p> <p class=3D"MsoPlainText"><span style=3D"color:#17375E"><o:p> </o:p></= span></p> <p class=3D"MsoPlainText"><span style=3D"color:#17375E">Sorry for the late = response.<o:p></o:p></span></p> <p class=3D"MsoPlainText"><span style=3D"color:#17375E"><o:p> </o:p></= span></p> <p class=3D"MsoPlainText"><span style=3D"color:#17375E">See the inline [Thi= ru]<o:p></o:p></span></p> <p class=3D"MsoPlainText"><span style=3D"color:#17375E"><o:p> </o:p></= span></p> <p class=3D"MsoPlainText"><span style=3D"color:#17375E">Here, I have </span= ><span style=3D"color:black">a </span><span style=3D"color:#17375E">question,<o:p></o:p></span></p> <p class=3D"MsoPlainText"><span style=3D"color:#17375E"><o:p> </o:p></= span></p> <p class=3D"MsoPlainText"><span style=3D"color:black">1</span><span style= =3D"color:#17375E">.Do We have to configure priority Zero on Master router = to do graceful failover?</span><span style=3D"color:black"><o:p></o:p></spa= n></p> <p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>= </o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Thank= s & Regards,<o:p></o:p></span></p> <p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;color:#1F497D">Th= irumavalavan Periyannan</span></b><span style=3D"font-size:10.0pt;color:#1F= 497D"><o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D">Assoc= iate SQA Engineer - VRRP Module Owner<o:p></o:p></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:#1F497D"><o:p>= </o:p></span></p> <p class=3D"MsoNormal"><b><span style=3D"color:#4A442A"><img border=3D"0" w= idth=3D"188" height=3D"65" id=3D"Picture_x0020_2" src=3D"cid:image001.jpg@0= 1CE134A.87062E80" alt=3D"Description: Description: Description: Description= : Description: Description: Description: Description: cid:image001.png@01CB= F547.656FF3F0"></span></b><span style=3D"color:#1F497D"><o:p></o:p></span><= /p> <p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p> </o:p></spa= n></p> <p class=3D"MsoPlainText">-----Original Message-----<br> From: Anurag Kothari (ankothar) [<a href=3D"mailto:[email protected]">mail= to:[email protected]</a>] <br> Sent: Saturday, February 23, 2013 12:57 AM<br> To: Thirumavalavan Periyannan; <a href=3D"mailto:[email protected]">[email protected]= rg</a><br> Cc: Peter Hunt<br> Subject: RE: [VRRP] vrrp Digest, Vol 81, Issue 3<o:p></o:p></p> <p class=3D"MsoPlainText"><o:p> </o:p></p> <p class=3D"MsoPlainText">Hi Thirumavalavan<o:p></o:p></p> <p class=3D"MsoPlainText"><o:p> </o:p></p> <p class=3D"MsoPlainText">Here are couple of points:<o:p></o:p></p> <p class=3D"MsoPlainText"><o:p> </o:p></p> <p class=3D"MsoPlainText">1) With something like "disable vrrp" o= r "shutdown vrrp" it will not be graceful as the router will trea= t it as a shutdown event (which is a break before you make approach) and th= e router will "Transition to the {Initialize} state". The backup router will wait for "Skew_Time"<b><span style=3D"col= or:red">[Thiru]I think, it’s Master_Down_interval time.</span></b> be= fore it becomes master; So we probably will have traffic loss for a period = approximately equal to "Skew_Time"<b><span style=3D"color:red">[T= hiru]I think, it’s Master_Down_interval time</span></b>. Even with Default = configuration this will be close to 609 ms which would be a duration long e= nough for to impact time sensitive applications (e.g. voice calls). For sur= e the actual failover time will depend upon the size of the Network and the switches in between but with the meth= od proposed below we can try to improve that time.<o:p></o:p></p> <p class=3D"MsoPlainText"><o:p> </o:p></p> <p class=3D"MsoPlainText">2) This will also improve convergence in scenario= s where we want the failover to trigger because of up uplink interface from= the router going down (tracking interface and decrementing the priority).<= o:p></o:p></p> <p class=3D"MsoPlainText"><o:p> </o:p></p> <p class=3D"MsoPlainText">I am not sure if you saw the modified proposal wh= ich was sent out today early morning. Here is the link to it in case you ne= ed it <a href=3D"http://www.ietf.org/mail-archive/web/vrrp/current/msg01489.html"= ><span style=3D"color:#0606BA;text-decoration:none">http://www.ietf.org/mai= l-archive/web/vrrp/current/msg01489.html</span></a><o:p></o:p></p> <p class=3D"MsoPlainText"><o:p> </o:p></p> <p class=3D"MsoPlainText">Thanks<o:p></o:p></p> <p class=3D"MsoPlainText">~Anurag<o:p></o:p></p> <p class=3D"MsoPlainText"><o:p> </o:p></p> <p class=3D"MsoPlainText"><o:p> </o:p></p> <p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:"Ti= mes New Roman","serif""><o:p> </o:p></span></p> <div class=3D"MsoNormal" align=3D"center" style=3D"text-align:center"><span= style=3D"font-size:12.0pt;font-family:"Times New Roman","se= rif""> <hr size=3D"2" width=3D"100%" align=3D"center"> </span></div> <p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar= ial","sans-serif";color:gray">DISCLAIMER:<br> This e-mail and any attachments to it may contain confidential and propriet= ary material and is solely for the use of the intended recipient. 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