Re: [VRRP] Proposal for Maintenance Event for VRRP [RFC-5798]
"Anurag Kothari (ankothar)" <ankothar@cisco.com> Fri, 22 February 2013 12:09 UTC
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From: "Anurag Kothari (ankothar)" <ankothar@cisco.com>
To: sreenatha <sreenatha.setty@ibtechnology.com>
Thread-Topic: [VRRP] Proposal for Maintenance Event for VRRP [RFC-5798]
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Date: Fri, 22 Feb 2013 12:08:55 +0000
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Subject: Re: [VRRP] Proposal for Maintenance Event for VRRP [RFC-5798]
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On Further Thought: We may want to define maintenance event (probably rename it "Priority Change Event") being triggered by a change in priority for a VRID (including dynamic changes to the priority e.g. changes due to tracking interface). This would make it more generic. Whenever the user configures priority = 0 (which will have to be allowed) it would trigger a failover to the backup router. Thanks -Anurag From: vrrp-bounces@ietf.org [mailto:vrrp-bounces@ietf.org] On Behalf Of Anurag Kothari (ankothar) Sent: Friday, February 22, 2013 6:42 AM To: sreenatha Cc: vrrp@ietf.org Subject: Re: [VRRP] Proposal for Maintenance Event for VRRP [RFC-5798] Hi Sreenatha My bad, by cancel I meant reset the timer. I would prefer defining maintenance event itself as (or being triggered by) priority being set to 0 for a VRID. So probably we can rephrase the proposal as: - If a Maintenance event is received, then: + Send an ADVERTISEMENT + Reset the Adver_Timer to Advertisement_Interval -endif // maintenance recv Thanks -Anurag From: sreenatha [mailto:sreenatha.setty@ibtechnology.com] Sent: Thursday, February 21, 2013 11:26 PM To: Anurag Kothari (ankothar) Cc: vrrp@ietf.org<mailto:vrrp@ietf.org> Subject: Re: [VRRP] Proposal for Maintenance Event for VRRP [RFC-5798] Hi Anurag, Your proposal is: - If a Maintenance event is received, then: + Cancel the Adver_Timer + Send an ADVERTISEMENT with Priority = 0 -endif // maintenance recv And you mentioned that router need to send regular ADVERTISEMENT message till it receives the ADVERTISEMENT message from the backup router. "2. How much time Master router should wait to receive ADVERTISEMENT message from any backup router? [Anurag] Master doesn't have to wait. After receiving the maintenance event it will send regular ADVERTISEMENT with Priority = 0 till some other router send back an ADVERTISEMENT message at which point it will transition to Backup." If Advert_Timer is cancelled, how regular ADVERTISEMENT messages are sent? So i am suggesting slight changes in the Proposal: - If a Maintenance event is received, then: + Change the router priority to 0 + Send an ADVERTISEMENT with Priority = 0 + Reset the Adver_Timer -endif // maintenance recv This will ensure that: 1. ADVERTISEMENT message with priority 0 is sent immediately on receiving Maintenance event. 2. Master router will send regular Advertisement message till it receives the ADVERTISEMENT message from any backup routers. Thanks, Sreenatha Setty On 02/21/2013 10:12 PM, Anurag Kothari (ankothar) wrote: Hi Sreenatha This ideas is based on the way the priority is defined in Section 5.2.4. and 6.1. of RFC-5798. " 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 time out. " " Priority <snip> The value of 0 (zero) is reserved for the Master router to indicate it is releasing responsibility for the virtual router. The range 1-254 (decimal) is available for VRRP routers backing up the virtual router. <snip> " Please see my responses inline [Anurag]: Thanks -Anurag -----Original Message----- From: vrrp-bounces@ietf.org<mailto:vrrp-bounces@ietf.org> [mailto:vrrp-bounces@ietf.org] On Behalf Of sreenatha Sent: Thursday, February 21, 2013 11:03 AM To: vrrp@ietf.org<mailto:vrrp@ietf.org> Subject: Re: [VRRP] Proposal for Maintenance Event for VRRP [RFC-5798] Hi Anurag, Proposed idea is good. I have some queries on this proposal: 1. On receiving new maintenance_event, priority of the router is not changed, right? So if back-up router has less priority, even if Master receives the ADVERTISEMENT from the backup router, Master will discard. So how the Master router state is going to change? [Anurag] On receiving the maintenance event the priority of router (or VRID) will change to 0. 2. How much time Master router should wait to receive ADVERTISEMENT message from any backup router? [Anurag] Master doesn't have to wait. After receiving the maintenance event it will send regular ADVERTISEMENT with Priority = 0 till some other router send back an ADVERTISEMENT message at which point it will transition to Backup. 3. Standard VRRP MIB(RFC-2787) does not allow user to configure '0' for VRRP Priority. So you are proposing to change this value also? [Anurag] Yes. Priority 0 will have to be made a user configurable value to indicate the intention of a router to relinquish Master Status. Thanks, Sreenatha Setty On 02/21/2013 01:30 AM, vrrp-request@ietf.org<mailto:vrrp-request@ietf.org> wrote: If you have received this digest without all the individual message attachments you will need to update your digest options in your list subscription. To do so, go to https://www.ietf.org/mailman/listinfo/vrrp Click the 'Unsubscribe or edit options' button, log in, and set "Get MIME or Plain Text Digests?" to MIME. You can set this option globally for all the list digests you receive at this point. Send vrrp mailing list submissions to vrrp@ietf.org<mailto:vrrp@ietf.org> To subscribe or unsubscribe via the World Wide Web, visit https://www.ietf.org/mailman/listinfo/vrrp or, via email, send a message with subject or body 'help' to vrrp-request@ietf.org<mailto:vrrp-request@ietf.org> You can reach the person managing the list at vrrp-owner@ietf.org<mailto:vrrp-owner@ietf.org> When replying, please edit your Subject line so it is more specific than "Re: Contents of vrrp digest..." Today's Topics: 1. Proposal for Maintenance Event for VRRP [RFC-5798] (Anurag Kothari (ankothar)) ---------------------------------------------------------------------- Message: 1 Date: Tue, 19 Feb 2013 22:08:41 +0000 From: "Anurag Kothari (ankothar)"<ankothar@cisco.com><mailto:ankothar@cisco.com> To:"vrrp@ietf.org"<mailto:vrrp@ietf.org> <vrrp@ietf.org><mailto:vrrp@ietf.org> Subject: [VRRP] Proposal for Maintenance Event for VRRP [RFC-5798] Message-ID: <A2BB90B33FFDF740876C5AAE307D83DB1C290327@xmb-rcd-x05.cisco.com><mailto:A2BB90B33FFDF740876C5AAE307D83DB1C290327@xmb-rcd-x05.cisco.com> Content-Type: text/plain; charset="us-ascii" Hi I want to propose a new Maintenance Event (modification of Shutdown Event) for VRRP (RFC-5798] which would allow to gracefully failover the VRRP Master to Redundant (Backup Router). Problem Statement: VRRP preemption is not configured on the redundant / backup router. How to initiate VRRP Traffic to failover to the redundant / backup router gracefully without modifying the configuration on the redundant / backup router (i.e. adding preemption) Proposed Solution: Addition to Section 6.4.3 of RFC-5798: - If a Maintenance event is received, then: + Cancel the Adver_Timer + Send an ADVERTISEMENT with Priority = 0 -endif // maintenance recv Unlike Shutdown event the router will not "Transition to the {Initialize} state" and continue to be Master and forward traffic till the backup router sends an ADVERTISEMENT (triggered by receiving an ADVERTISEMENT with Priority = 0) and becomes master. Here are couple of examples of how a maintenance event may be triggered 1) By some user command e.g. "maintenance-mode" in the vrrp configuration. 2) By setting the priority = 0 for a particular VRID. Thanks -Anurag -------------- next part -------------- An HTML attachment was scrubbed... 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- [VRRP] Proposal for Maintenance Event for VRRP [R… Anurag Kothari (ankothar)
- Re: [VRRP] Proposal for Maintenance Event for VRR… sreenatha
- Re: [VRRP] Proposal for Maintenance Event for VRR… Anurag Kothari (ankothar)
- Re: [VRRP] Proposal for Maintenance Event for VRR… sreenatha
- Re: [VRRP] Proposal for Maintenance Event for VRR… Anurag Kothari (ankothar)
- Re: [VRRP] Proposal for Maintenance Event for VRR… Anurag Kothari (ankothar)
- Re: [VRRP] Proposal for Maintenance Event for VRR… Anurag Kothari (ankothar)
- Re: [VRRP] Proposal for Maintenance Event for VRR… sreenatha
- Re: [VRRP] Proposal for Maintenance Event for VRR… Anurag Kothari (ankothar)
- Re: [VRRP] Proposal for Maintenance Event for VRR… sreenatha
- Re: [VRRP] Proposal for Maintenance Event for VRR… Anurag Kothari (ankothar)
- Re: [VRRP] Proposal for Maintenance Event for VRR… sreenatha
- Re: [VRRP] Proposal for Maintenance Event for VRR… Anurag Kothari (ankothar)
- Re: [VRRP] Proposal for Maintenance Event for VRR… Adrian Farrel