Network Design

Jan 12, 2007

I'm designing a network that should be able to support both dedicated servers and also offer colocation (full rack and half rack). Things will be relatively small at start but the design must be able to scale. The colo area will be secured from the dedicated server area.

Right now, this is what I'm thinking:

CORE/DISTRIBUTION combined:
- Two cisco 6509's running HSRP
- Each 6509 is connected to the same two upstream ISP's via BGP (so that means 4 links in total)
- Each 6509 is connected to the access switches (described below)
- The 6509's will have a single gigabit crossconnect between them so that they can talk to each other for HSRP, iBGP, etc.

ACCESS
- Each of our racks will have an L3 switch at the top of the rack for all the servers in the rack to plug into
- there will be ~30 servers per rack
- these switches will use 4 x 1 gbit ports for trunking to the core. They will be configured in two 802.3ad link aggregation groups (ie 2 x 1gbit links per LAG group). One LAG group will connect to the first 6509, the second LAG group will connect to the second 6509.
- The default gateway on these L3 switches will be configured with the HSRP virtual IP address of the 6509's.
-spanning tree will have to be enabled to avoid loops since the two 6509's are connected directly also

QUESTIONS:
1) Each dedicated server will get 5 usable IP addresses, so I'd have to subnet my IP address space accordingly (into a bunch of /29's). This also means that I'd have to setup 1 VLAN per subnet (wich means 1 VLAN per server!). Is this a scalable design? If I have 1000 servers I'd need 1000 VLAN's! Isn't there a limit to the number of VLANS that can be created/handled by my core switches? How do larger providers do it that have thousands of servers?

2) Is this design scalable/redundant? The only single point of failure that I see is my access switch (if it dies, it could take out a rack's worth of servers). I guess I would have to live with this and would have spares on hand.

3) I'm a little confused with the interaction of BGP and HSRP. What happens, for example, if one of the links to one of the ISP's goes down on the active HSRP router? I dont want it to fail over to the inactive HSRP router, because the router is still good, its just a link that went down. Would the active HSRP router be smart enough to realize (maybe via iBGP) that the inactive HSRP router can still route to that ISP and thus just ROUTE the traffic to that inactive 6509 and then have that router send it out to the ISP? I'm assuming this traffic would travel across the 1gbit xconnect between the two 6509's so I may have to consider increasing that capacity using link aggregation aswell?

4) Which cisco switch would be good as my L3 access switch? It would have to support ~30 servers in the rack plus have at least 4x1gbit ports that I can config into two lag groups to uplink to the core.

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Network Design / VLANs Design

Apr 9, 2008

We are co-located at a datacenter and host web sites, and corporate email systems, as well as host dedicated servers for customers.

We currently have two /25 internet facing subnets from our provider. We have a Watchguard X5500e 8 port gigabit firewall that supports routing as well as VLANs. We also currently own QTY4 2848 HP Gigabit switches.

We currently have each switch connected in a loop with 2 gigabit ports trunked using static LCAP. The switches are connected as follows:
A > B
B > C
C > D
D > A

Rapid STP is turned on. One thing is - is this the ideal trunking scheme?

The more important question is this. We would like to separate ips from each other using VLANing.

IE: we might have a client with 5 different IPs in one or more subnets and we would like to group them together.

We ideally do not want to break up the subnets into smaller ones as it makes it hard to reconfigure and it wastes ip addresses, as we do not have that many.

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Sep 24, 2007

I am comming across a few questions on how to do a setup for a network. I expect to have a redundant configuration similar to this:

________ISP1_______________ISP2
__________|(bgp)_____________|(bgp)
_______Router ---------BGP-------- Router
__________|_____\____ ___/_____|
__(bgp/ospf)|_________/_________|(bgp/ospf)
__________|___/___________ ___|
______L3 switch______________L3 switch

To this point (i hope the ascii diagram is understandable, i did my best on ASCII art), there are no problems. The problem comes when pluging in L2 switches. I would like them to be pluged to both L3 switches, but i don't see how to do this without HSRP or VRRP. The thing is L3 switches will also do VLAN's for the network, so HSRP would mean using 3 IP's for every VLAN and a terrible configuration mess.

I am not seeing the way to do this setup and attach a L2 switch to both L3 switches without using HSRP.

I just want redundancy for the case where one of the routers or L3 switches could fail.

Any light on this kind of setup?

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Quote:

Hi Sean, my name is Ben, and I am giving you 24 hours to remove your web site template that you have stolen otherwise I will public display that you have ripped another members template for personal use without permission of the original owner


Wow that was a bit significant to me as we bought this template from DooptNet here at WHT and the thread is located above. We paid $100 AUD/USD for this and we never stole it as it was said in the starting sentence from Ben.

Ben went on to say that:

Quote:

This topics will be displayed in the largest on-line communities on the internet, these include Web Hosting Talk, Warez-BB, wjunction and so forth.

For real right?

Ben also went on further to say that many other people have fallen for this and this is all part of a Con. I am not sure if Ben is telling the truth, But I would like some word from Sean @ DooptNet and this Ben Person.

No E-mail Address was left but - Admin@webhostingtalk.com in the Live Chat.

I asked Ben where we have ripped this site from as I would like to see it, After this Ben left the chat but before hand demanded that I remove the Stolen Content within 24hrs.

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Mar 3, 2009

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Since there is many experts on this forum i would like advise from you guys.
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64 bytes from hivelocity.net (69.46.24.178): icmp_seq=1 ttl=119 time=30.0 ms
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