loadbalancing

[daveporter123]

how we can have load balancing in routing protocol as well as in switching network, how many possible method for the load balancing as well as feature for the same technology?

how can i configure loadbalancing in static routes?

and what are the requirememt for loadbalancing in switching network?

dporter

[vladrac-ccna]

Load balancing.

Hello Dave, that's "easy" to answer (kidding).

L2 loadbalancing, I believe this can only be done using spanning-tree and multiple-vlans, and with etherchannels.

with STP, If you have 2 uplinks, 1 vlan would be fwd in 1 link, and 2nd vlan would be fwd in the 2nd link.

check:

Introduction to VLAN Load Balancing Between Trunks

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

for etherchannel:

http://www.cisco.com/warp/public/473/4.html

Understanding EtherChannel Load Balancing and Redundancy on Catalyst Switches

For layer 3:

first hop redundancy

HSRP: configure 2 groups (2 virtual IPs) and set a group of host with gateway 1, and another set with gateway 2.

http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cg/hiap_c/ch20/haiphsrp.htm

GLBP

Load balancing is achieved with up to 4 gateways on the same subnet , sharing the same IP but with different virtual macs.

http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cg/hiap_c/ch20/haipglbp.htm

Server loadbalancing:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipr_c/ipcprt1/1cfsflb.htm

TCP Loadbalancing with NAT:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cg/hiad_c/ch20/ntbaddrs.htm#wp1048769

Routing Loadbalancing:

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094820.shtml

Loadbalancing "in hardware"

http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120s/120s21/pplb.htm

For static routes, you just need to create 2 statements:

ip route IP mask gate1

ip route IP mask gate2

and use maximum-paths (in some routing protocols that dont do equal-cost load balancing per default).

I hope this is a start point for you,

if it helps, please rate this post.

Vlad

[devang_etcom · Accepted solution]

and in EIGRP dont forgot to use the VARIANCE...

dave you can have the basic like perpacket loadbalanicing or per destination loadbalancing...you will get this information form the cisco.com...and yes vlad is also post some good links for the reference...

and in etherchannel you can also have l2 and l3 both...

whenever talking about the load balancing in switch STP: then you can have MST, PVST...

you can also have load balancing with bundaling using the multilink ppp also...which is very nice feature: http://www.cisco.com/en/US/tech/tk713/tk507/technologies_configuration_example09186a00800a3b7a.shtml

you can have CEF loadbalncing also but for that first of all you need to read the CEF and for loadbalancing you can have: http://www.cisco.com/en/US/products/hw/modules/ps2033/prod_technical_reference09186a00800afeb7.html

HSRP and GLBP you can have for loadbalancing as well as High Avaibility option also...

hope all this help you

rate this post if it helps

regards

Devang