[c-nsp] Multicast Core

[Alexander Clouter]

Tony Bunce <tonyb at go-concepts.com> wrote:
> 
>> Ours definiately do, otherwise I would imagine all that IPTV traffic on
> 
> Are you using the 3750s for layer3 or just layer2?  If just layer2 
> what are you using as your as your multicast router?
>
Mixed, but generally L3.  The uplink links are port-channel'd 'hybrid' 
L2/L3 links:
----
interface Port-channel1
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 979
 switchport trunk allowed vlan 127-130,901,979
 switchport mode trunk
 ip arp inspection trust
 ip dhcp snooping trust
end
----
 
The native VLAN carries all the L3 routing and thus obviously also the 
multicast traffic up to the access layer.  FYI, VLAN's 127->130,901 are 
the L2 and RSPAN bits, but those carry next to no multicast traffic.

> ...but the 3750 can do stacking.
>
Cross stack channel bonding is *very* nice.  We use it for our servers 
and our uplinks with great success; especially handy when you want to be 
clever with your UPS and hook up half of your stack to the UPS feed and 
the other to raw mains.

Cheers

-- 
Alexander Clouter
.sigmonster says: Sorry.  Nice try.