From: Todd Veillette (tveillette@myeastern.com)
Date: Wed Jun 02 2004 - 13:31:47 GMT-3
Kenneth,
Also you can add redundancy by setting your channel across blades; but I
believe it will cost some cpu and backplane BW.
-TV
----- Original Message -----
From: "Kenneth Wygand" <KWygand@customonline.com>
To: "Ken Diliberto" <ken@kdmd.net>; "Group Study" <ccielab@groupstudy.com>
Sent: Wednesday, June 02, 2004 9:58 AM
Subject: RE: Connecting two core switches / Design
> Hello everyone, and thanks!
>
> I mistakenly thought the WS-X6416-GBIC module was subject to the same
> "maximum of 1gbps transfer across entire etherchannel" as the
> WS-X6148-GE-TX module. Since that time I've found out the WS-X6416-GBIC
> module is not subject to this same limitation, so I can in fact just
> bundle a whole bunch of gigabit interfaces into a large pipe.
>
> Thanks again for all of your responses!
>
> Kenneth E. Wygand
> Systems Engineer, Project Services
> CISSP #37102, CCNP, CCDP, ACSP, Cisco IPT Design Specialist, MCP, CNA,
> Network+, A+
> Custom Computer Specialists, Inc.
> "The only unattainable goal is the one not attempted."
> -Anonymous
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Ken Diliberto
> Sent: Wednesday, June 02, 2004 1:03 AM
> To: Group Study
> Subject: Re: Connecting two core switches / Design
>
> Kenneth,
>
> The answer you're looking for is - That Depends.
>
> Are you switching between the two? Routing?
>
> Are the 6500's sitting next to each other or do you have limited fiber
> available between them?
>
> Are your servers on one side and clients on the other?
>
> What do your traffic levels look like now?
>
> And the big question: How much money do you have?
>
> We have three 6500's in our core - each with redundant Sup-II/MSFC-II
> and redundant fabric. They are connected in a triangle with one GigE
> from a sup and the second from a 6516. This provides some failure
> protection. These links are a combination of L2 trunk and L3 routed
> link (we're moving to the L3 option for everything).
>
> We have the luxury of excess fiber so adding bandwidth is as simple as
> another pair of GBIC's on each end and configuring a channel.
>
> I call the 6500 Ciscos Swiss Army Knife. There are many different ways
> to do things. What's your current configuration?
>
> Ken
>
> Kenneth Wygand wrote:
> > Mas,
> >
> > This brings me back to the real source of my question - then what
> would
> > be the best way to interconnect, say, two 6509 switches in my core?
> >
> > Kenneth E. Wygand
> > Systems Engineer, Project Services
> > CISSP #37102, CCNP, CCDP, ACSP, Cisco IPT Design Specialist, MCP, CNA,
> > Network+, A+
> > Custom Computer Specialists, Inc.
> > "The only unattainable goal is the one not attempted."
> > -Anonymous
> >
> > -----Original Message-----
> > From: P729 [mailto:p729@cox.net]
> > Sent: Tuesday, June 01, 2004 4:27 PM
> > To: Kenneth Wygand; Group Study
> > Subject: Re: Connecting two core switches / Design
> >
> > I'd recommend keeping the core as fast and streamlined as
> > possible--perhaps
> > minimal ACL's to guard against potential errors in ACL's made in the
> > distribution layer(s) not under your administrative control. I
> wouldn't
> > go
> > so far as to say keep QoS out of the core completely: I'd push
> > classification and policy enforcement out as far to the edge as
> > possible/practical--at least to the distribution layer and use QoS
> only
> > for
> > queue management in the core (set the trust boundary at the
> distribution
> > layer to protect the core and keep it fast). Oversubscription? If you
> > have a
> > robust and diverse core, you may want to consider expected service
> > levels
> > during potential outages and perhaps keep critical links
> > _under_subscribed
> > by a certain amount.
> >
> > Regards,
> >
> > Mas Kato
> > https://ecardfile.com/id/mkato
> >
> > ----- Original Message -----
> > From: "Kenneth Wygand" <KWygand@customonline.com>
> > To: "Group Study" <ccielab@groupstudy.com>
> > Sent: Tuesday, June 01, 2004 8:47 AM
> > Subject: Connecting two core switches / Design
> >
> >
> >
> >>Hello all,
> >>
> >>
> >>
> >>I was thinking about large providers that need to connect core
> >
> > switches
> >
> >>at very fast speeds. For example, say I have two 6506 core switches I
> >>wanted to connect in the backbone. Say each one is terminating 20 -
> >
> > 30
> >
> >>fiber gigabit speed links. I would think it would be a poor idea to
> >>oversubscribe the link between these switches to a 1GBit or even
> >
> > 10GBit
> >
> >>link. If the link was oversubscribed, logic would think that QoS
> >
> > should
> >
> >>be employed here to make sure critical traffic (voice, video) gets
> >>through first, but all design guides point towards keeping all QoS out
> >>of the core to simply switch packets as fast as possible...
> >>
> >>
> >>What is recommended and is there any documentation / experience anyone
> >>can contribute?
> >>
> >>
> >>
> >>Thanks!
> >>
> >>
> >>
> >>Kenneth E. Wygand
> >>Systems Engineer, Project Services
> >>
> >>CISSP #37102, CCNP, CCDP, ACSP, Cisco IPT Design Specialist, MCP, CNA,
> >>Network+, A+
> >>Custom Computer Specialists, Inc.
> >>
> >>"I am not really smart. I just stick with problems longer."
> >>-Albert Einstein
> >>
> >>
> >>
> >>Custom Computer Specialists, Inc.
> >>
> >>"Celebrating 25 Years of Excellence"
> >>
> >>[GroupStudy removed an attachment of type image/gif which had a name
> >
> > of
> > image001.gif]
> >
> >>
> >
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