HSRP

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Jun 28th, 2007
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hi,

when i configure HSRP do i have to configure the same configuration on both the routers or will both be working at once?can i have 4 diffent servers on one Switch(4507R) and other 4 on other?will this work or do i have to put all the eight servers on one switch???

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JORGE RODRIGUEZ Thu, 06/28/2007 - 13:56
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Hi Mathur,


the concept of HSRP is to provide protection from a single router failure, so you need the two routers functioning

and communication stablished between them in order to configure HSRP,




This is a basic scenarion with two routers and one switch, their fast ethernet connections connect to the switch, you can

have your servers connected to the switch as well , servers default gateway will be the HSRP IP address.



RouterA

interface fastethernet 0

Description Connection to switch1_port1_VLAN2

ip address 1.0.0.1 255.0.0.0

standby 1 ip 1.0.0.3 ----->>> HSRP

standby 1 preempt

standby 1 priority 110

standby 1 authentication denmark

standby 1 timers 5 15




RouterB


interface fastethernet 0

Description Connection to switch1_port2_VLAN2

ip address 1.0.0.2 255.0.0.0

standby 1 ip 1.0.0.3 ----->>> HSRP

standby 1 preempt

standby 1 authentication denmark

standby 1 timers 5 15



Refer to these links for basic information


HSRP Implementation

http://www.cisco.com/en/US/tech/tk1330/technologies_design_guide_chapter09186a008066670b.html#wp3330



Q&A on HSRP

http://www.cisco.com/en/US/tech/tk648/tk362/technologies_q_and_a_item09186a00800a9679.shtml



If you need help implemeting it please let us know.



HTH, please rate is this helps




Jorge




mathurmahesh Fri, 06/29/2007 - 08:38
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thanks for the reply but i want to know whether both will be active or only one will be active(not HSRP active/standby but i m talking about the systems connections)???

dvagadiya Fri, 06/29/2007 - 09:39
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Mahesh,


Do you want to load balance HSRP?


Technically traffic will be going throuth the active box.


Or you can try GLBP (Gateway Load Balancing Protocol)


Regards,

Dipak Vagadiya

Network Engineer,

Walt Disney Internet Group

JORGE RODRIGUEZ Fri, 06/29/2007 - 12:26
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Hi Mathur,


In the HSRP implementation one router will be the standby. In the the example I provided RouterA will be the active router since it has the highest value in the standby prempt command, RouterB is the standby router. You can always manipulate which router you want to forced to be active or stanby through the " standby preempt ".

bu traffic will be only go through the active one.



See standby preempt

http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a0080094e8c.shtml



as far as systems connections goes the standby and active router is totally transparent to them. Your systems default gateway will be 10.0.0.1 255.0.0.0 based on the above example, if RouterA fails your systems will still have network connectivity through the HSRP IP routerB.


Now, if you are looking for traffic load balancing between the two routers I would recommend GLBP which is what Dvafadiya posted.



see GLBP

http://www.cisco.com/en/US/products/ps6350/products_configuration_guide_chapter09186a008042fb97.html



HTH, rate if this helps


Jorge







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