I am looking for any design advice, ideas, for an upcoming project as follows:
There will be 2 6509 switches for core (Collapsed Backbone)
These 2 core switches will connect to 2 more 6509s for use as server distribution switches
The core switches will also connect to 7 4506s in the wiring closet.
The main question I am struggling with is what is the best way to achieve VLAN load balancing & redundancy to the wiring closet, and the server distribution layer (We will have about 20+ VLAN's)?
Secondly, should I connect our firewalls & Mainframe (via OSAs) to the Core or to the server distribution layer? Pros/Cons of one vs the other
I have read numerous Cisco Technical documents including those that pertain to design, but I still feel that I need some detailed feedback from those that have implemented a similar design in a Data Center.
Interesting case. I would say that there is one fundamental flaw in the proposed design: The aggregated bandwidth of the servers will certainly be a lot bigger than the total link capacity between the 6500's. This will limit network performance under heavy load.
Therefore, a collapsed backbone may not be the best solution. You may achieve better performance with a conventional switch-block according to the hierarchical model. This will allow you to make better use of the bandwidth of your switch-backplanes. There will be less blocking in this type of design. You can also achieve the redundancy level that is characteristic for the hierarchical model. This redundancy is achieved by the combined use of HSRP and spanning tree.
[toc:faq]The ProblemOn traditional switches whenever we have a trunk
interface we use the VLAN tag to demultiplex the VLANs. The switch needs
to determine which MAC Address table to look in for a forwarding
decision. To do this we require the switch to do...
[toc:faq]Introduction:Netdr is a tool available on a RSP720, Sup720 or
Sup32 that allows one to capture packets on the RP or SP inband. The
netdr command can be used to capture both Tx and Rx packets in the
software switching path. This is not a substitut...
IntroductionOSPF, being a link-state protocol, allows for every router
in the network to know of every link and OSPF speaker in the entire
network. From this picture each router independently runs the Shortest
Path First (SPF) algorithm to determine the b...