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HSRP Behavior

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Fri, 07/08/2011 - 06:15
Apr 20th, 2011
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HSRP Behavior


Issue:

I have 2 Cisco 3560 Switch connected and a Trunk link is configured between them allowing all the VLAN. Also HSRP is configured with virtual IP address as 192.168.1.100. A server is connected with Multipath configured in its NIC. SWITCH 1 is ACTIVE & SWITCH 2 is STANDBY.

By Chance if the trunk link between the switches goes down both the switches will become ACTIVE.

In this scenario, how the traffic flow path is going to be? Since the virtual IP MAC will be given by both the switch, which path the Server NIC will choose?




Resolution:


If only one NIC is active then any traffic coming into the switch with the standby NIC connection destined for the server would need to be sent across the switch interconnect.

If the interconnect fails between the switches this does not affect the active server NIC. The active server NIC will stay the same and therefore the server will continue to use the switch it was using before the failure. Obviously though return traffic may very well not reach the server as it may come in on the other switch.



Source:- https://supportforums.cisco.com/message/3048197#3048197

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Robert Connelly Mon, 04/25/2011 - 21:58
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Your question is misleading teaming and Multipath is diffrent So you need to be specific in teaming and multipath. Multi-path implies extra redundancy and a higher cost. Where the bonded/team nic config does not have multiple paths just multiple NICs.  Multiple Nics are great and should point not at your HSRP but at the actual ip of your swithcs - if you are using Multipath via cost then you would still need to use the actual ip of the gw and let the Multipath determin the direction of the traffic.  You are trying to use redundancy at the server level and at then at the network level you need to pick one.

sanjay9110 Fri, 07/08/2011 - 06:15
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I Think we can use Burn In MAC Address (BIA) by manully defining, instead of auto assigned virtual MAC.


Sanjay

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