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Flooding/PortStorm Control via Seperated VLAN

Posted on 2002-04-10
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Last Modified: 2010-04-17
A simple question always confuse me,

Cisco switch equipped with Default Vlan, enable Flooding/PortStorm Control is the way to block the broadcast packet, which means network traffic will be reduced to minimum, if I am not in mistake. Is there any reason set a seperate vlan for a 100 user's network that include Support/Developer/sales/operation, if Flooding/PortStorm control enabled ? Will Seperate Vlan control network traffic better ?

Thanks,
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Question by:joehuang
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4 Comments
 
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Expert Comment

by:geoffryn
ID: 6932114
How many nodes are attached to the switched network?  Usually broadcast traffic is not significant in well segmented LANs.
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Author Comment

by:joehuang
ID: 6932584
Around 25 servers plus 80 workstations, there are 4 cisco switches-c2924, and I do not see any network traffic problem from the network monitor application for each switch.

Devide those node to 5 vlans is from a contract guy, even I mention that there is no network traffic problem here, but it seems that he is concerning other type of traffic ...  I would like to know any advantage about these vlan according to my network size.
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geoffryn earned 150 total points
ID: 6934173
With you network size, I doubt that you see any benefit at all from VLANs in terms of network traffic optimization.  If yo uVLAN everything, then you have to come up with a backend routing solution to route the vlan traffic. This seems complicated and a waste of effort.
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Author Comment

by:joehuang
ID: 6935831
Yes, You are correct.

One of C3550 Layer 3 switch is to be a distribution layer for routing traffic to intranet/internet between vlan/firewall/intranet/internet.

Place web server in one of vlan behind firewall instead of place web server in DMZ zone, then open ICMP port in firewall in order to ping public ip address anywhere for monitoring purpose with CISCO Secure Server/IDS,It seems strange to me in security issue.
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