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Re: [Bier] DR election ...

"Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net> Mon, 09 November 2015 15:08 UTC

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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: Haoweiguo <haoweiguo@huawei.com>, Robert Raszuk <robert@raszuk.net>, IJsbrand Wijnands <ice@cisco.com>
Thread-Topic: [Bier] DR election ...
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Date: Mon, 09 Nov 2015 15:08:51 +0000
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Cc: "bier@ietf.org" <bier@ietf.org>
Subject: Re: [Bier] DR election ...
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Not exactly sure about the details of active-active or active-standby scenarios and their relationship to BIER, but here is my understanding:

- BIER architecture has three layers: multicast overlay, bier forwarding, and routing underlay. It is really the multicast overlay's job to handle the multi-homing - be it PIM, IGMP/MLD, or BGP, or any other things.
- While Ice's DR election draft was triggered from using IGMP/MLD to replace PIM for multicast overlay signaling in a BIER domain and the draft has some BIER keywords in it, it is really independent of BIER. The draft is still applicable if BIER had never happened.

Jeffrey

From: BIER [mailto:bier-bounces@ietf.org] On Behalf Of Haoweiguo
Sent: Thursday, November 05, 2015 7:39 PM
To: Robert Raszuk <robert@raszuk.net>; IJsbrand Wijnands <ice@cisco.com>
Cc: bier@ietf.org
Subject: Re: [Bier] DR election ...


I agree with Robert's comments. I think BIER also should cover active-active and active-standby access scenarios.

Thanks,

weiguo

________________________________
From: BIER [bier-bounces@ietf.org] on behalf of Robert Raszuk [robert@raszuk.net]
Sent: Friday, November 06, 2015 8:36
To: IJsbrand Wijnands
Cc: bier@ietf.org<mailto:bier@ietf.org>
Subject: [Bier] DR election ...

Ice,

As we duscussed offline there are practically two major types of multihomed deployments in production networks:

1. True multihoming ... each edge router connect to CEs over different subnet

2. Active/standby .. there is multiaccess lan but VRRP is used so hosts can have single default out.

Now moreover beteen BIER domain and multicast senders and receivers there will pretty much always CEs. I am worried that most BIER slides skip those.

Cheers,
R.

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