Re: Measuring VLAN performance
- From: Trendkill <jpmason@xxxxxxxxx>
- Date: Mon, 8 Jun 2009 06:37:00 -0700 (PDT)
On Jun 8, 7:17 am, "Gerard Gallagher" <gallaghe...@xxxxxxxxxxx> wrote:
Hi all,
I'm in the process of converting a flat network (approx 2000 users) to a
more layered approach using VLANS.
We have 2x Cisco 6509 switches with Sup720's configured as a HSRP core,
linked with a l3 etherchannel, and an l2 etherchannel.
Each closet will comprise 3 vlans - one for voice, one for data and VLAN1
for management.
I would like to know how the addition of vlans is affecting the overall
network - i.e as areas come off vlan1 for user traffic and get moved to
their respective vlan how the overall network performance is hopefully
improving, and I'm looking for any information that would help me measure
this, or indeed any aspect of the network which I should be measuring. The
idea is to be able to show how the vlan introduction is helping the site.
Many thanks in advance.
Regards,
Ger
To be honest, you shouldn't see much benefit or disadvantage to the
change in architecture. Presuming your old config was a single vlan,
the only traffic that will be greatly reduced is broadcast
traffic...but for 2000 nodes.....not a big deal on a gig or multi-gig
network. In the old config, nodes off closet 1 would broadcast for
any of the other 2000 nodes, but the traffic itself would only go
between source and destination (within the closet or to another
closet, etc). Now the nodes will only arp within the same closet,
greatly reducing broadcasts across the core. To be honest, all you
are doing is enabling the routing on the 6500s which will now control
traffic between vlans, when before, they probably only controlled
ingress/egress to the single vlan. So you are definitely doing the
right thing in terms of scalability, but I doubt you will see any
major performance increase...unless you had slower links or some major
load that would drive broadcasts...but arp/cam timers should limit
that impact.
.
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- From: Gerard Gallagher
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