FWIW, I can't confirm this at this second, but I believe that at least the cisco 7200 series routers have a three PCI bus backplane. And it is claimed to support an OC-3c VIP2 port adapter, although I haven't put mine in action to try yet (and when I do I won't be running anywhere near 155 Mbps anyway). A single VIP2 port adapter can only connect to one of the three buses, so presumably cisco believes that PCI is up to the task. I don't know what the clockrate is, and I don't know if it is 32-bit or 64-bit.
-----Original Message----- From: Jeremiah Kristal [SMTP:jeremiah@corp.idt.net] Sent: Monday, July 21, 1997 5:40 PM To: Chris Wilson Cc: Perry E. Metzger; nanog@merit.edu Subject: Re: is there a market for this?
On Mon, 21 Jul 1997, Chris Wilson wrote:
Actually, I've seen a PCI-based box doing 15MByte/sec sustained read/write to disk, so it is possible to do it, but it's not likely to be standard for quite a while. I certainly think that an OC-12 card would be overkill though. I'm also wondering why someone who can afford an OC-x would be trying to save a couple bucks by using a PCI-based router. Once you get into this type of bandwidth, I think a bus becomes a serious chokepoint.
On Mon, 21 Jul 1997, Jacques Vidrine wrote:
FWIW, I can't confirm this at this second, but I believe that at least the cisco 7200 series routers have a three PCI bus backplane. And it is claimed to support an OC-3c VIP2 port adapter, although I haven't put mine in action to try yet (and when I do I won't be running anywhere near 155 Mbps anyway). A single VIP2 port adapter can only connect to one of the three buses, so presumably cisco believes that PCI is up to the task. I don't know what the clockrate is, and I don't know if it is 32-bit or 64-bit.
I'm pretty sure the 7200's bridged 3 PCI buses are the fast PCI bus, clocking at 533 MBps, but just because they come out with an interface for a box doesn't meant that that box can realistically support it. It's not unheard of for vendors to come out with a box that you can over subscribe. 7200's max throughput is about 3-4 DS3s.. Also, 7200s don't have VIP2s. 7200 is basically a VIP2 in a chassis. -dorian
On Mon, 21 Jul 1997, Dorian R. Kim wrote: ==>I'm pretty sure the 7200's bridged 3 PCI buses are the fast PCI bus, ==>clocking at 533 MBps, but just because they come out with an interface ==>for a box doesn't meant that that box can realistically support it. ==>It's not unheard of for vendors to come out with a box that you can ==>over subscribe. 7200's max throughput is about 3-4 DS3s.. ==> ==>Also, 7200s don't have VIP2s. 7200 is basically a VIP2 in a chassis. If I remember right, the published bandwidth per bus on CCO is 300 Mbps. One of the buses is only used for the I/O controller fast ethernet port. The other two buses cover the odd slots and the even slots (if I remember right). /cah
participants (3)
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Craig A. Huegen -
Dorian R. Kim -
Jacques Vidrine