RARE user and assistance email list

[mc36 <>]

hi,

On 2/10/21 1:11 PM, Tim Chown wrote:
> > On 8 Feb 2021, at 14:12, mc36 <> wrote:
> >
> > hi,
> >
> > On 2/8/21 2:10 PM, Simon Leinen wrote:
> > > This GÉANT/EUMETSAT collaboration famously uses multicast:
> > > https://impact.geant.org/portfolio/eumetsat/
> > > This type of use cases should be supported by BIER, provided we can
> > > bring this to the end sites.
> > surely we can! we have software based forwarder for bier with eactly
> > the same capabilites the tofino have: bier label replication, imposition
> > and decapsulation, and evpn/vpls flood reduction in software mode.
> > these software forwarders link with dpdk or libpcap so runs on anything,
> > and uses the same api from freertr, also so the user experience is the
> > same, regardless if the forwarding is done in asic, dpdk or pcap.
> >
> > > As for the backbone, it could be a nice
> > > application for a RARE/Tofino-based overlay - we could remove the burden
> > > of multicast routing from the backbone routers if that's desired.
> > agree, this "stateless" multicast is a very fancy thing to have!
> > assuming a geant sized network, just one source per site can result
> > in a huge mesh tree if it would be done by mldp, p2mp-te or pim,
> > probably this is why basically we don't see real-world multicast
> > applications…
>
> Yes, that’s a big driver for bier.  The challenge is content.  I remember 
> watching NASA on multicast (bone) at uni well over 20 years ago.  Much of the 
> current use of multicast seems to be local (like Bonjour in a lan, or control 
> protocols over a site), last mile, or on private networks (Stig says Cisco 
> multicast is used by private financial ticker-tape type applications).
>
> Much of the original case for multicast seems to have been assimilated by CDN 
> infrastructure, though that may not be great for live TV.  There must be a 
> LOT more football streaming now fans can’t be at grounds, via various 
> services like iFollow in the UK.  How is that done?
i dont know ifollow, but saw some cdn nodes as most of us host google global 
cache, akamai
and friends in our nern networks.... the interface stats here are not as 
nice, 1/2 of the
upload is download here... so imho the real gain is the latency toward the 
users... if you
look at what youtube-dl does, they operate in small chunks of payload, each 
having it's own
url so it's not too hard them to 'cache' 'realtime' streams... but things 
change... and as
the masses get hit by the multicast, there will be apps using it as the 
developers will get
familiar with it... and there is a good change for it to happen, as cisco 
does a trick to the
ipv6 and multicast, that is, once enabled, it enables on all the interfaces 
and you have to
selectively disable it... it's the complete opposite of what they do on ipv4 
so, i see the
chances here....:)
regards,
cs


c8kv#show ipv6 pim interface
No interfaces found.

c8kv#show running-config | include ipv6
ipv6 unicast-routing
 ipv6 enable
c8kv#conf
c8kv#configure
Configuring from terminal, memory, or network [terminal]?
Enter configuration commands, one per line.  End with CNTL/Z.
c8kv(config)#
c8kv(config)#ipv6 multicast-routing
c8kv(config)#^Z
c8kv#show ipv6 pim interface
Interface          PIM   Nbr   Hello  DR
                         Count Intvl  Prior

Tunnel0            off    0     30     1
    Address: ::
    DR     : not elected
Null0              off    0     30     1
    Address: FE80::1
    DR     : not elected
GigabitEthernet1   on    0     30     1
    Address: FE80::200:11FF:FE11:0
    DR     : this system
GigabitEthernet2   off    0     30     1
    Address: ::
    DR     : not elected
GigabitEthernet3   off    0     30     1
    Address: ::
    DR     : not elected
GigabitEthernet4   off    0     30     1
    Address: ::
    DR     : not elected
GigabitEthernet5   off    0     30     1
    Address: ::
    DR     : not elected
GigabitEthernet6   off    0     30     1
    Address: ::
    DR     : not elected
GigabitEthernet7   off    0     30     1
    Address: ::
    DR     : not elected
GigabitEthernet8   off    0     30     1
    Address: ::
    DR     : not elected

c8kv#
c8kv#show ip pim interface

Address          Interface                Ver/   Nbr    Query  DR         DR
                                          Mode   Count  Intvl  Prior
c8kv#
c8kv#
c8kv#conf
Configuring from terminal, memory, or network [terminal]?
Enter configuration commands, one per line.  End with CNTL/Z.
c8kv(config)#
c8kv(config)#ip multicast-routing distributed
c8kv(config)#do sh ip pim int

Address          Interface                Ver/   Nbr    Query  DR         DR
                                          Mode   Count  Intvl  Prior
c8kv(config)#





> Tim