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["Jeffrey (Zhaohui) Zhang via groups.io" <>]

Hi CS,

It's not exactly clear to me about the problem and solution here, but I have 
some thoughts to share.

If we want to send duplicate traffic through different topology for 
redundancy purposes, the best to do is at overlay not at BIER layer itself.

Taking MVPN as example - it can be configured and signaled as such that an 
I/S-PMSI tunnel goes through two sub-domains. Each sub-domain is associated 
with its own topology.

In case of IGP, each topology is an ISIS/OSPF multi-topology or flex algo. In 
case of BGP, multi-topology can be realized through BGP-CT or how the routes 
are advertised, with or without BIER. When you add BIER into the BGP case, 
you just need to advertise different BIER information (for different 
sub-domains) along the different paths.

Jeffrey


Juniper Business Use Only
-----Original Message-----
From: mc36 <>
Sent: Saturday, June 24, 2023 5:32 PM
To: Jeffrey (Zhaohui) Zhang <>; ; Tony 
Przygienda <>
Cc: Tim Chown <>; Mohácsi János 
<>; Kaliraj Vairavakkalai <>; 
Natrajan Venkataraman <>
Subject: Re: bier in a ring ---- was: Re: [freertr] bier over bgp-ct...

[External Email. Be cautious of content]


weelll i cannot didnt meant a preface switch but a ring of routers... 
XDDDDDDDDDDDDDD

       /~~~r2~~~\
      r1        r4-----core
       \___r3___/


On 6/24/23 23:23, mc36 wrote:
> hihi,
>
> so with some spf magic/config-knob and on a ring topology from the uplink 
> "area":
>
> so basically no new code to the asic to have the iptv distributed already 
> to all the nodes....
>
> especially if the asics are on different line cards as they should beee....
>
> then just some backplane magic basically..... at least here... XDDDDDDD
>
> just that
>
>             /~~~r2~~~\
> r1--<                     >--r4-----core
>             \___r3___/
>
> r4 sets the 11100000 in the bier header and send out on both the left 
> interfaces....
>
> and when gots back (normally wont) then the loop just ended here.....
>
> isnt that?!
>
> thx,
>
> cs
>
>
> On 6/24/23 23:20, mc36 wrote:
>>
>>
>> On 6/24/23 23:19, mc36 wrote:
>>> aaand back to this... so with some spf magic and on a ring topology from 
>>> the uplink "area"
>>>
>>> it basically no new code also to have the iptv distributed already to all 
>>> the nodes....
>>>
>>> just that
>>>
>>>              /~~~r2~~~\
>>> r1--<                     >--r4-----core
>>>              \___r3___/
>>>
>>> r4 sets the 11100000 in the bier header and send out on both the left 
>>> interfaces....
>>>
>>> and when gots back (normally wont) then the loop just ended here.....
>>>
>>> hmmmmm....................
>>>
>>>


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