07-08-2009 09:35 AM - edited 03-06-2019 06:38 AM
I am needing to configure two 3750s with HSRP so that I can get a virtual IP address. 3750 #1 will have one of my internet connections and 3750 #2 will have the other. Can I use IP SLA so that if Internet connection on 3750 #1 goes down that the default route is changed to 3750 #2? I have two redundant switches behind the 3750s which each will have two connections (one to each 3750). I think that this is possible, but not 100% sure how to go about it. In theory I think that I would hook them up similar to the following...
3750 #1
Port 1 goes to internet connection #1
Port 2 goes to redundant switch A
Port 3 goes to redundant switch B
3750 #2
Port 1 goes to internet connection #2
Port 2 goes to redundant switch B
Port 3 goes to redundant switch A
Port 1 on both 3750s will hook directly to separate firewalls and have a private address. I am assuming that another port is needed on the switch for HSRP.
Thanks for any assistance that you can provide!
07-08-2009 10:02 AM
Yes, you can use IP SLA and track with ICMP a route towards the internet. If the route goes down, your HSRP should decrement on the active router and the secondary will take over.
HTH,
__
Edison.
07-08-2009 10:31 AM
Sorry...I logged in with my work account Ya...that is pointing me in the right direction. Would you know of any sample configs that can point me in the right direction?
07-08-2009 10:49 AM
Here is an idea on how to track with HSRP
http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a0080094e8c.shtml
Just replace the interface as the trigger with an IP SLA track.
HTH,
__
Edison.
07-08-2009 11:11 AM
Just curious, is there a reason you don't wish to stack the two 3750s?
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