All things related to multicast

[Zenon Mousmoulas <>]

On 11 Ιουν 2008, at 11:43 ΜΜ, Pekka Savola wrote:

> On Wed, 11 Jun 2008, Niels den Otter wrote:
> > Pekka Savola wrote:
> > > We've for years now installed policers in our upstream/peering
> > > interfaces which rate-limit SAP to 1 mbit/s.  That has saved our  
> > > and our
> > > customers' backsides a couple of times already -- without  
> > > crippling the
> > > real use of SAP.
> >
> > Would you happen to have an example Junos configuration to do this  
> > in global configuration?
>
> Add in appropriate input interfaces' input ACLs something like:
>
>        term Multicast_SAP_ratelimit {
>            from {
>                destination-address {
>                    224.2.127.254/32;
>                }
>            }
>            then {
>                policer SAP_MULTICAST_POLICER;
>                accept;
>            }
>        }
>
> Which refers to:
>
> firewall {
>    policer SAP_MULTICAST_POLICER {
>        if-exceeding {
>            bandwidth-limit 1m;
>            burst-size-limit 100k;
>        }
>        then discard;
>    }
> }

I see this is a rather different approach from the IOS "ip multicast  
rate-limit", which (supposedly) works by setting limits per S,G. I'm  
not sure at all if this could be considered an "equivalent" for JunOS,  
but wouldn't it make sense to use multicast flow maps and policies (if  
available on the platform)?

[edit policy-options]

prefix-list sapMcastGroup {
 224.2.127.254;
}

policy policyForSap {
 from {
  prefix-list sapMcastGroup;
 }
 then accept;
}

[edit routing-options]

multicast {
 flow-map flowMapForSap {
  bandwidth 1m;
  policy policyForSap;
 }
}

Multicast Flow Maps:
http://www.juniper.net/techpubs/software/junos/junos91/swconfig-multicast/flow-maps.html#id-12238432

Defining Bandwidth for Multicast Flows:
http://www.juniper.net/techpubs/software/junos/junos91/swconfig-multicast/defining-bandwidth-for-multicast-flows_1.html#id-12316189

Apologies if I'm totally missing the point here...

Z.