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Unanswered Question
Dec 1st, 2008

In my existing n/w l3 switch connected to router through 4 l2 switches(i.e. in between router and l3 switch 4 l2 switches avilable). i m totally having 30 l2 switches which is connected to l3 switches.whether it is advisable to connect to l3 switch directly connected to router. if it is , what is the advantages of connecting l3 switch directly to router.

I have this problem too.
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Joseph W. Doherty Mon, 12/01/2008 - 07:37

The advantage of having your L3 switch directly connected to the router, it avoids L2 switch processing latency (generally very minimal) and L2 switch congestion issues, both latency and drops. The latter can be significant, or not. I.e., without knowing much more about your topology and hosts, 4 L2 switches between your L3 switch and router, might not be an issue, or could be a major issue (as could one L2 switch between your L3 switch and router).

PS:

If the router in question connects to WAN, often the WAN link is more of a concern than LAN L2 topologoy.

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