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Cisco guys, got a minute?


carl0s

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What switch are you running,,,, if its is a layer 3 switch...if so, get that to do the interVlan routing..the performance wouldnt be an issue

 

I presume to be able to do VLANs at all it must be a Layer 3 switch.

Anyway there are a couple of 3548s, a 3508, an a.. I dunno.. an older version of the 3548.

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I just read and thought some more. If the VLAN'ing is just partitioning off ports then it won't necessarily need to look at IP addresses so mightn't be layer 3, anyhoo I guess you're about to tell me whether they are or not.

 

But. if so.. that sounds fab. interVlan routing - does that mean the switch does the routing between the vlans? :o wowzers. that'd be awesome. that'd get the full 1gbps between the two offices.

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Setup Vlans on the switch, and a trunk port and hook that to the FA interface on the router (just the one) and do routing on the stick.

 

 

To keep things simple I would leave them seperate if there are enough interfaces.

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I just read and thought some more. If the VLAN'ing is just partitioning off ports then it won't necessarily need to look at IP addresses so mightn't be layer 3, anyhoo I guess you're about to tell me whether they are or not.

 

But. if so.. that sounds fab. interVlan routing - does that mean the switch does the routing between the vlans? :o wowzers. that'd be awesome. that'd get the full 1gbps between the two offices.

 

Vlaning is all layer 2 and independant of network protocol, so no addressing would need to be changed.

 

Some higher level switches have layer 3 routing builtin or with add on routing modules.

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If it supports full layer 3 then it will do routing, otherwise I don't know...

 

You did say which switches they are, can't be arsed to read back on the post, so what where they?

 

3548 x 2 and 3508 x 1 and an older 29xx one.

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You dont have to use router on a stick with trunking.

 

You can have two interfaces on your router configured as they are and just make sure they are plugged into the correct VLANs on your switch, thats its, very simple :)

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Carlos - before I go to bed.

 

Make sure you are more or less sure that what you are doing it going to work BEFORE you make a change on a LIVE network.

 

how are you going to test the config?

how will you deal with downtime?

and if things dont work out....make sure you have secured another job..

 

no kidding, make sure you know how to put the system back to what it was.

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Carlos - before I go to bed.

 

Make sure you are more or less sure that what you are doing it going to work BEFORE you make a change on a LIVE network.

 

how are you going to test the config?

how will you deal with downtime?

and if things dont work out....make sure you have secured another job..

 

no kidding, make sure you know how to put the system back to what it was.

 

Don't worry! :D Thanks though ;)

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I'm trying to think of reasons to eliminate the second interface on the 3640. I could move the 10.0.10.0 subnet onto the 100mbps, and have the 3640 routing via the ISA server. Not sure why it would be of benefit, except it's allow firewalling and stuff.

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