From: Howard C. Berkowitz (hcb@gettcomm.com)
Date: Thu Apr 17 2003 - 22:09:37 GMT-3
>"cannonr" <cannonr@attbi.com> wrote,
>I never said to use a 6509 for WAN routing. I stated that it is much faster
>for inter-vlan routing.
His specific question -- see the subject -- was about border routers.
The most common usage of "border" is LAN to WAN. I recognize there is
the ASBR ABR usage in OSPF, but most often, the ASBR and ABR are
still on WAN boundaries. We describe a consensus BGP usage in
http://www.ietf.org/internet-drafts/draft-ietf-bmwg-conterm-04.txt
>He said he was designing a data center. Data
>center's typically have large server farm's. My point was the inter-vlan
>routing on the 6509 is much faster than inter-vlan routing on the 7200.
>There wasn't enough information to recommend a WAN design since there was no
>mention of media, capacity, objective etc... He was simply asking which one
>was faster.
And there is no single definition of speed, unless you clarify, for
example, you say forwarding performance as defined in RFC 2544. Most
performance specialists are extremely reluctant to describe "speed"
with a single parameter, especially when the forwarding may be
associated with policy enforcement services.
>
>----- Original Message -----
>From: "Howard C. Berkowitz" <hcb@gettcomm.com>
>To: <ccielab@groupstudy.com>
>Sent: Thursday, April 17, 2003 4:08 PM
>Subject: Re: OT: 6509 or 7200, which is better for border router?
>
>
>> At 7:30 PM +0000 4/17/03, cannonr@attbi.com wrote:
>> >Just to give you an idea of what the difference is.
>>
>> But isn't this an apples and oranges comparison given the original
>> question? Assuming the border router is going to the WAN, first, the
>> WAN link is probably much slower than the LANs and is going to be the
>> limiting factor in transfer, not the forwarding speed of the router.
>>
>> Border routers may also need to do significant policy enforcement,
>> security, QoS, accounting, and other processor-intensive functions.
>>
>> >I went from having
>> >intervlan routing on a 7513 router running dcef to a 6500 MSFC with a
>> >supervisor 1A engine and mls. before the change, I did a file transfer
>from a
>> >server on a different VLAN to my laptop....Tried this a few times. I
>> >calculated about 16Mbps total throughput. When I made the change, I
>> >copied the
>> >same file and got over 55Mbps throughput. Keep in mind that my
>> >laptop is a POS
>> >with a slow hard drive. Also, this was on a MSFC1. MSFC2's do MLS
>> >through CEF
>> >and are supposed to be much faster.
>>
>> Again, what problem are you trying to solve? Raw forwarding speed
>> makes no difference if the outbound link is significantly slower than
>> the inbound.
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