Re: [Bier] DR election ...

["Jeffrey (Zhaohui) Zhang" <[e-mail]>]

Neither should BIER care - or it's transparent to PIM/BIER ... that's my point.

> -----Original Message-----
> From: Toerless Eckert [mailto:[e-mail]]
> Sent: Tuesday, November 10, 2015 5:34 PM
> To: Jeffrey (Zhaohui) Zhang <[e-mail]>
> Cc: Haoweiguo <[e-mail]>; Robert Raszuk <[e-mail]>;
> IJsbrand Wijnands <[e-mail]>; [e-mail]; [e-mail]
> Subject: Re: [Bier] DR election ...
> 
> 
> https://en.wikipedia.org/wiki/MC-LAG ???
> 
> Thats an L2 technology, PIM would neither know nor care.
> 
> If you're talking about eg: dual-PE or in general dual PIM routers
> connecting to the same LAN, PIM DR/DF priority can follow VRRP/HSRP
> priority to leverage their fast failover draft-zhou-pim-vrrp-03.
> 
> There is no load-splitting in this approach though, so only one
> router is DR/DF. If you want load-balancing, you may want
> draft-ietf-pim-drlb (currently expired, already had last call).
> 
> 
> Toerless
> 
> On Tue, Nov 10, 2015 at 02:52:49PM +0000, Jeffrey (Zhaohui) Zhang wrote:
> > [ + PIM ]
> >
> > Weiguo,
> >
> > In the MC-LAG case, put aside BIER, how does it work today with PIM?
> >
> > Jeffrey
> >
> > From: Haoweiguo [mailto:[e-mail]]
> > Sent: Tuesday, November 10, 2015 7:19 AM
> > To: Jeffrey (Zhaohui) Zhang <[e-mail]>; Robert Raszuk
> <[e-mail]>; IJsbrand Wijnands <[e-mail]>
> > Cc: [e-mail]
> > Subject: RE: [Bier] DR election ...
> >
> >
> > Hi Jeffrey,
> >
> > There are two multi-homing scenarios, one is multi-homed network,
> another one is multi-homed device. For multi-homed network, the network is
> a LAN, DR/DF mechanism can be used to select one router as master and
> other routers as slave, only the master router can forward traffic to the
> LAN network, IGMP/MLD extension can be used for the DR/DF election, this
> is the focus of draft-wijnands-bier-mld-lan-election-00. However, if a
> multicast source or receiver is directly accessed to two multicast routers
> through MC-LAG, flow-based loadbalancing can be achieved for uplink
> direction traffic. In this case, IGMP/MLD can't be used for DR/DF election
> for the MC-LAG. I think the new DR/DF election mechanism should also cover
> the MC-LAG multi-homed scenario.
> >
> > My two cents.
> >
> > Thanks,
> >
> > weiguo
> >
> > ________________________________
> > From: Jeffrey (Zhaohui) Zhang [[e-mail]]
> > Sent: Monday, November 09, 2015 23:08
> > To: Haoweiguo; Robert Raszuk; IJsbrand Wijnands
> > Cc: [e-mail]<mailto:[e-mail]>
> > Subject: RE: [Bier] DR election ...
> > 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:[e-mail]] On Behalf Of Haoweiguo
> > Sent: Thursday, November 05, 2015 7:39 PM
> > To: Robert Raszuk <[e-mail]<mailto:[e-mail]>>;
> IJsbrand Wijnands <[e-mail]<mailto:[e-mail]>>
> > Cc: [e-mail]<mailto:[e-mail]>
> > 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 [[e-mail]] on behalf of Robert Raszuk
> [[e-mail]]
> > Sent: Friday, November 06, 2015 8:36
> > To: IJsbrand Wijnands
> > Cc: [e-mail]<mailto:[e-mail]>
> > 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.
> 
> > _______________________________________________
> > BIER mailing list
> > [e-mail]
> > https://www.ietf.org/mailman/listinfo/bier
> 
> 
> --
> ---
> Toerless Eckert, [e-mail]