Switch Topology
in [Cisco]
|
Prev: CISCO 851 -VPN CLIENT
Next: 3620 boot from tftp
From: Gary on 6 Sep 2006 17:43 We have 2 x 6500 high end switches and several smaller 3500 switches. We currently connect the 3500's together using their GIG ports, so have a GIG backbone, and each end of the 3500 chain connects into each of the 6500's Would it be better to break the circuit and connect each 3500 to the 6500s so a kind of Star topology or make it a fully circular type topology where each switch only sees the 6500's through another 3500. What is best method here? Distances are small in the region of 50ft. Gary
From: Merv on 6 Sep 2006 17:59 Gary wrote: > We have 2 x 6500 high end switches and several smaller 3500 switches. > > We currently connect the 3500's together using their GIG ports, so have a > GIG backbone, and each end of the 3500 chain connects into each of the > 6500's > > Would it be better to break the circuit and connect each 3500 to the 6500s > so a kind of Star topology or make it a fully circular type topology where > each switch only sees the 6500's through another 3500. YES YES YES !!! Why ? MUCH easier to trouble shoot Lower uplink utilization per 3500 switch as each one would have a dedicated link to 6500
From: Walter Roberson on 6 Sep 2006 18:11 In article <8iHLg.9696$Tl4.6993(a)dukeread06>, Gary <gshine(a)netlink.info> wrote: >We have 2 x 6500 high end switches and several smaller 3500 switches. >We currently connect the 3500's together using their GIG ports, so have a >GIG backbone, and each end of the 3500 chain connects into each of the >6500's >Would it be better to break the circuit and connect each 3500 to the 6500s >so a kind of Star topology Watch out for oversubscription of the backplane connections on the 6500, and make sure that you know which ports of the interface card have buffers in common. (Be sure you know what kind of fabric connect your supervisor / line-card combination is using, and how that fabric bandwidth is divided up between the ports.)
From: AM on 7 Sep 2006 09:48 Merv wrote: > Gary wrote: > >>We have 2 x 6500 high end switches and several smaller 3500 switches. >> >>We currently connect the 3500's together using their GIG ports, so have a >>GIG backbone, and each end of the 3500 chain connects into each of the >>6500's >> >>Would it be better to break the circuit and connect each 3500 to the 6500s >>so a kind of Star topology or make it a fully circular type topology where >>each switch only sees the 6500's through another 3500. > > > YES YES YES !!! I can guess that's the better solution in the world but from the last sentence of Gary (...a fully circular...) I can not figure out how the connections could be done. If the 3500s are connected in circle and each one is connected to the 6500 how each 3500 can see the 6500 through another 3500? TIA Alex.
From: Walter Roberson on 7 Sep 2006 10:43
In article <OqVLg.98127$zy5.1567915(a)twister1.libero.it>, AM <am(a)am.am> wrote: >I can guess that's the better solution in the world but from the last >sentence of Gary (...a fully circular...) I can >not figure out how the connections could be done. >If the 3500s are connected in circle and each one is connected to the >6500 how each 3500 can see the 6500 through >another 3500? If a link between the 3500 and 6500 were to fail (e.g., cable gets cut or GBIC burns out) then the 6500 would still be reachable by sending the data to one of the other 3500's connected to the one with the link failure. |