Regarding InterVlan routing between three Cisco 3750 switches

[HppaqCom]

Hi

I have a query regarding the Intervlan Routing

Iam trying to do the following setup
I have 3 Cisco 3750 switches that are connected in triangle shape. A ,B ,C are the switches

I have added a new Cisco 3750 switch between the A and B named it as D . These three switches form a redundancy link ( Triangle shape A--D--B)

What type of routing should i use for the Inter VLAN routing

Thanks in advance

vikku

 

[burtsbees]

If you have four switches, they are not in a triangle.
First off, why?
Second, you'll need to enable STP for sure.
Third---how many VLANs? Are you planning to have the switches do the routing of the vlans? What vlans are going to be in what switches? Are they stacked?

Burt

 

[HppaqCom]

HI burstbees

Please find here the network diagram link


I am planning to implement total 50 Vlans

Each switch will be handling around 15 Vlans. I wish that switch will do the routing. The switches are not stacked they will be placed indifferent locations .

The locations A and C are very far around 700m apart. The Location D will handle traffic of 300 Pc's and the remaining will handle around 600 Pc's



Thanking you
HppaqCom

 

[burtsbees]

I will look tomorrow---it is 1AM here in the USA where I am.

Burt

 

[HppaqCom]

Thnks for respomding Brut


I hope a that u will provide solution for this design . Sun just rose here UK 7.OO am

k Gud Night

Hppaqcom

 

[VinceWhirlwind]

So you have one single layer-3 switch in all of this?

As you haven't documented any other services, the logical switch to be your Layer-3 switch would be A or B.
You then need STP to sort out all those links which will mostly therefore be disabled.

 

[vipergg]

Either OSPF or EIGRP would work fine . Both are about the same as far as difficulty in implementing.

 

[HppaqCom]

Hi Vipergg


Iam using these switches as back bone switches

I will be connecting cisco 2950 with gigabit uplinks as the remaining switches in the network for A,B,C, D

Switch A is connected to the application server . The users in A, B,C ,D will be accesing the application server .

Any query from client Pc connected to the backbone switch should be sent to the main switch A and then to the server


Thanking you
hppaqcom

 

[VinceWhirlwind]

Routing is less efficient than switching, so you might want to make "A" your "core" switch handling all your interVLAN routing, trunking the relevant VLANs out to your other switches and using STP to block the redundant links between B--C & B--D.

I guess a less desirable option would be to enable IP routing on all 3 of your 3750s. With only 3 switches, there doesn't seem any real need to use any routing protocol, you just need to weight against the use of the redundant B--C & B--D links.

Really, it would be much more useful to have multiple links in an etherchannel on each of the A--B,A--C,A--D links rather than redundant links between B--C & B--D.
With only 600 Users per 3750, a 4-link etherchannel would provide plenty of bandwidth but you would need a 12-port fibre 3750 to stack with Switch "A".
Unless you are using 3750Es, which would give you nice 10Gb links. You could concentrate them at "A" using a 3560 or something.

 

[HppaqCom]

hi

Thanks for the clarification.

I will create the interface for the VLAN and trunk it on the remaining switches.i will try this and test it .


I needed clarifications form some experts so i posted this.


thanks again
hppaqcom