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HSRP on SVI. How is incoming traffic affected?

Let's say I have two distribution routers with SVI's using HSRP. Router 5 is the active router for the SVI for VLAN 5 and Router 6 is in standby (lower priority is set). Would incoming traffic be balanced between the two routers or all go through Router 5? I heard somewhere that only outbound traffic will go through the active router but with incoming traffic it could go to either SVI on the routers. Why is this so? This is the typical hierarchical model, core -> dist -> access.

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1 ACCEPTED SOLUTION

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Green

Hi,Your routers 5 or 6 may

Hi,

Your routers 5 or 6 may simply be the best path back to your
network from the the routing beyond the SVIs.

Your SVIs are in your distribution switches I assume they have connectivity to your core layer.
May be you are running a routing protocol like OSPF etc to the core routers hence the best route back to your network
can vary betweeen router 5 & 6 depending on where the traffic is coming from.


 Regards
Alex

Regards, Alex. Please rate useful posts.
4 REPLIES
Green

Hi,When you deploy HSRP your

Hi,

When you deploy HSRP your PCs etc normally use the
the virtual IP adress as their default gateway.

The virtual IP address is handeled by the ACTIVE router
in your case Router 5.
Router 6 will only become ACTIVE in the event of router 5 failing.

If you want to look at load balancing you could use GLBP as you
first hop router method.

Here are a couuple of link to look at.

http://www.cisco.com/c/en/us/support/docs/ip/hot-standby-router-protocol-hsrp/10583-62.html#topic1

http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp_fhrp/configuration/12-4/fhp-12-4-book.html

Regards
Alex

Regards, Alex. Please rate useful posts.
New Member

Thank you for the information

Thank you for the information. One thing is, when running a traceroute to a computer behind the SVI, the path will sometimes go through router 5 and sometimes go through router 6. I think all outbound connections will go through the active router (router 5). Wondering why this is with inbound connections?

Green

Hi,Your routers 5 or 6 may

Hi,

Your routers 5 or 6 may simply be the best path back to your
network from the the routing beyond the SVIs.

Your SVIs are in your distribution switches I assume they have connectivity to your core layer.
May be you are running a routing protocol like OSPF etc to the core routers hence the best route back to your network
can vary betweeen router 5 & 6 depending on where the traffic is coming from.


 Regards
Alex

Regards, Alex. Please rate useful posts.
New Member

Thank you for the

Thank you for the clarification :). Yes OSPF.

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