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New Member

Load Sharing between 2 core switches and 1 edge switch

Hi,

I have 2 x 4500 core switches. They have HSRP running betwen them and have a port-channel between them.

I have a 3550 edge switch that I want to connect to both the switches in a load-sharing and load-balancing way.

Please help.

Thanks

8 REPLIES

Re: Load Sharing between 2 core switches and 1 edge switch

HI

What sort of load sharing u r trying to accomplish.r u trying to accomplish vlan load-balancing then go for this link.

http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a00800ae96a.shtml

Thanks

Mahmood

New Member

Re: Load Sharing between 2 core switches and 1 edge switch

Hi,

Please find attached a diagram of the network.

Vlan 30 is management.

Vlan 46 is configured for all the ports for access.

I need the load balacing beween my two uplinks to differnt cores. When I connect now I am getting a loop and the network hangs.

Thanks

Re: Load Sharing between 2 core switches and 1 edge switch

Hello

You need STP in order to avoid the layer2 loop created by the etherchannel between this 2 switches, also to use HSRP on this config you'll need to make the 3550 the root on our STP.

My advice would be route between the Distribution switches (dont use trunk, use routed interfaces) and let HSRP work through the Access switch.

Vlad

New Member

Re: Load Sharing between 2 core switches and 1 edge switch

Hi,

Well, the VLAN info is on the core switches. How can we use HSRP through the core switches?

Thanks.

Re: Load Sharing between 2 core switches and 1 edge switch

I think best practise would be avoiding layer 2 loops.

dont use trunk between the cores, use routing.

keep everything the same as is now, just change the trunk to a routed interface (you need 1 subnet for this).

And do HSRP through the access vlan.

example

core1:

vlan 10

int vlan 10

ip address 10.10.1.1 255.255.255.0

standby ip 10.10.1.10

standby priority 200

standby preempt

core2

vlan 10

int vlan 10

ip address 10.10.1.2 255.255.255.0

standby ip 10.10.1.10

standby priority 150

standby preempt

use this in both cores, and you are good to go.

vlad

Re: Load Sharing between 2 core switches and 1 edge switch

so you have HSRP already running on both the switch...and when ever you are going to add the new switch then you can make the member of the HSRP group...and when ever you are going to have load balancing in HSRP then you need to creat the the multiple HSRP group...

and other option you can have GLBP...but i think it will be not suiteble to you as you are have already configure HSRP...other wise it will be good to have GLBP for load balancing as well as the resource utilisation...

i think you can have good reading material on this link:http://www.cisco.com/en/US/products/hw/switches/ps628/products_configuration_guide_chapter09186a008007e932.html

rate this post if it helps

regards

Devang

New Member

Re: Load Sharing between 2 core switches and 1 edge switch

here is the solution.

This story is all about having multiple gateways in a single machine that you can have ok

1- STP make sure your etherchannel is in blocking mode for vlan 30 and 46 so that you have both the uplink from 3550 in forwarding state which is required for load sharing. ok

2- now suppose you have HSRP configured like this.

[dist-1]

int VLAN 46

ip add 46.0.0.1 255.255.255.0

standby ip 46.0.0.254

[dist-2]

int vlan 46

ip add 46.0.0.255.255.255.0

standby ip 46.0.0.254

3- Now on your machine you need make some changes.

suppose you have 100 machine ip from 46.0.0.20-120

on machine from 46.0.0.20-80 make sure primary gateway is 46.0.0.1 & secondary is 46.0.0.254

and machine from 46.0.0.81-120 you have primary gateway is 46.0.0.2 and secondary gateway is 46.0.0.254

boom it's done load balancing and load sharing.

please rate if it works

New Member

Re: Load Sharing between 2 core switches and 1 edge switch

sorry for typo it's

[dist-2]

int vlan 46

ip add 46.0.0.2 255.255.255.0

standby ip 46.0.0.254

254
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