Posted on 2003-03-02
Medium Priority
Last Modified: 2013-11-15
Hello friends,

1) How many Network can be connected to a router?

2) How many Network can be connected to a Fast ethernet ?

Thanks in advance

Question by:noushad
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LVL 50

Expert Comment

by:Don Johnston
ID: 8055072
1) One for every interface.

2) If you're not trunking, one. If you are trunking, as many as you want.


Accepted Solution

pedrow earned 108 total points
ID: 8055084

1) depends on the router. I think the 6509 supports 1028 or more vlans...You can certainly number vlans up to 4096 at least, but the actual limit is pretty high. How's that for precise.

2) I don't really think there's a physical limit on the number of subinterfaces you can put on a FE interface(there might be), but it might be more limited by performance degredation and your memory.

So, in a nutshell, what I'm saying is that the limitations of IOS running on a particular hardware platform are much higher than any sane person will probably use in a production environment. But sanity I'm sure is a relative parameter ;)

Author Comment

ID: 8055322
Hello friends

Thanks for the immeadiate Reply.......

See i have one cisco 3660 series router it has got two fast ethernet . In our case we have one primary network( and one secondary network ( in the fast ethernet f0/0. How many networks can be added to one fast ethernet?

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Expert Comment

ID: 8055463

Can you?

Or Should you?

A lot of your decision is largely based on how much aggregate traffic you plan on seeing across these interfaces.

i.e. you could put a lot more low-traffic subinterfaces on a FastE than high-traffic ones.
LVL 13

Expert Comment

ID: 8057454
The fact is you can add a lot more than is practical from a performance standpoint. On the 3660 it allows up to 1400 VLANS, but I would limit it to no more than a dozen per interface in most cases.  


Author Comment

ID: 8417714
Thanks for all your help

 point for Dr.Ip and Pedrow


Expert Comment

ID: 8420480
A request for deletion was made, but I clearly see where the desire was to award the points.  I am awarding the points.  BTW, we can't split points where each expert would receive less than 20 points each, so I am accepting the first answer of the 2 mentioned.  If you'd like the other expert to receive points as well, I can give you instructions for that.

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