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nekau_65641's avatar
nekau_65641
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Apr 07, 2008

Using same LB for servers on multiple subnets

We are soon putting our newly purchased BIG-IP 3400's into production is a redundant configuration.     I have used Cisco LB's before, and the inside interface where the servers are only suppor...
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cybershoe's avatar
cybershoe
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Apr 20, 2015

Kevin,

 

With a Forwarding virtual server, BIG-IP will use its routing table to find the next hop for incoming traffic. All Forwarding (IP) virtual servers in the same route domain will use the same routing table, including default gateway (or gateway pool). Putting your forwarding VS on a VLAN in its own route domain would let you specify a different default gateway for traffic ingressing into that RD.

 

A "Transparent" virtual server is a Standard Network virtual server, with the "Address Translation" option unchecked. Your pool would contain the IP address(es) of your next-hop routers. With a transparent virtual server, BIG-IP will load balance that flow to the L2 address of your router, but leave the L3 address intact. It's essentially outbound ISP load balancing, but with a single next-hop pool member.

 

Either route domains or a transparent virtual server will let you achieve what you're looking to do.

 

Cheers,

 

  • Adam