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TOPIC: Why Routers are preferred over multilayer switch

Why Routers are preferred over multilayer switch 1 year 8 months ago #38591

  • rahsin
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Hello,

Why Routers are preferred over multilayer switch (MLS) in production environment even MLSs are cheaper compared to routers.

Thanks,
Rahsin
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Why Routers are preferred over multilayer switch 1 year 7 months ago #38600

  • Chojin
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They aren't :-).

A 6500 or 4500 is a multilayer switch and is common use as coreswitch and router to do switch and routing same time.
CCNA / CCNP / CCNA - Security / CCIP / Prince2 / Checkpoint CCSA
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Why Routers are preferred over multilayer switch 1 year 6 months ago #38609

  • Chris
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Rahsin,

A Router's primary role is to connect a LAN network with the Internet or an ISP, while a multilayer's switch primary role is to switch packets within the same LAN.

I've also seen cases where routers have replaced multilayer switches within a network and in most cases, its not the best design approach. The most common reason we see routers being used as multi-layer switches, is because they are usually more cheaper to provide this functionality (interVLAN routing), as opposed to layer-3 switches which are considerably more expensive.

You can read up on InterVLAN-routing and various methods this can be supported on our popular article InterVLAN Routing - Routing between VLAN Networks.

One thing you should be aware of is that multilayer switches are much faster than routers as packets are switched at wire-speed, where as routers introduce a delay which cannot be avoided (due to the packet processing mechanism) and increases as traffic increases on the router's interfaces, ultimately creating a bottleneck.

Hope this helps!

Chris.
Chris Partsenidis.
Founder & Editor-in-Chief
www.Firewall.cx
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