On Fri, Jul 24, 2009 at 03:05:23PM +0400, Alexandre Snarskii wrote: > Just a note: that 128Gbps looks to me like a 'true marketing number', > because of what ex-series show in cli is 32Gbps: > > s...@switch> show interfaces vcp-0 > Physical interface: vcp-0, Enabled, Physical link is Down > Type: 105, Link-level type: 70, MTU: 1514, Speed: 32000mbps > > Well, there are two virtual-chassis interfaces, and they have > both input and output directions, and 32G * 2 * 2 is really 128Gbps > of marketing... > > Or am I wrong, and virtual-chassis really can do 128Gbps full-duplex > on both ports ? And, anyway, 32Gbps is still better than 10Gbps > and saves uplink ports.
You are right. The rear VC ports are PCI-Express 2.0 x8 ports, giving 500 Mbytes/sec/lane * 8 lanes * 8 bits/byte = 32 Gbps per direction [1]. [1] http://en.wikipedia.org/wiki/PCI_Express _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
