The blade buffer is not ugradable If you are planning to use 10Gig blade, use the 8 port blade (X6708) instead. The 6704 can not be used for VSL link, if you decide to use VSS in the feature. The 6708 has a much higher buffere size (198 MB).
10Gb line cards are supported only on the Sup720 and the Sup2T.
In addition to Reza's post, if you are planning to upgrade to Sup2T (soon or sometime in the future) you may want to reconsider as some blades (like the X6708) is not compatible with the Sup2T and the X6716 will need a hardware upgrade.
Re: 6509E, four port 10G blade, buffers 16M per port
x6704 has less buffer than x6708 as in theorical terms this is non blocking card. It is connected to the fabric via 2 x 20Gb fabric channels so 16M of buffer is deemed enough. x6708 on the contrary is a 2:1 blocking card (still 2 x 20Gb fabric channel) therefore bigger ingress buffers can help in case of congestion.
But this is not all... due to the way buffering and forwarding is handled through the fabric the topic is much more complicated than this. We need to consider many other elements and not just rx/tx port buffers.
The key difference between the 6704 and 6708 cards is their Fabric ASICs with the latter having a completely different architecture which allows it to prevent those conditions which end up in fabric flow control events and in turn in drops which cannot be prevented even if much higher port ASIC buffers were available.
I cannot go too deep in terms of architecture (this place is not appropriate and I don't want to get you bored to death)... I just wanted to point out that port buffers are not the only element to consider.
In other word 6704 is a card which will work more than fine in the majority of implementations, but in case of heavily congested networks (with lots of mcast traffic which must be locally replicated by the replication ASIC) a 6708 would perform better even if it had the same buffer of the 6704 (provided that we only use for instance 2 ports on each card).
We are pleased to announce availability of Beta software for 16.6.3.
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looking for early feedback from customers befor...
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