Gateway of Last Resort

[brian.vanoy]

we currently have a pre-existing internet connection that supports all company traffic, however, we are installing a secondary internet connection that is meant to support internet traffic coming from our lab.  can my switches handle multiple gateways or last resort (Cisco 3750's) for both subnets?

Current configuration for existing traffic

MPLS > 2800 Router > 3750 Switch Stack

inside traffic 192.168.10.x 255.255.255.0

gateway of last resort being 0.0.0.0 0.0.0.0 192.168.10.1 (Router)

New Lab Traffic would need to traverse

 3750 Switch > 3750 Switch Stack (Above) > New Internet Border Router > Comcast

inside traffic 70.40.216.x 255.255.255.0

gateway of last resort would need to be 0.0.0.0 0.0.0.0 70.46.216.1 255.255.255.0

Any assistance with this would be helpful

[Reza Sharifi]

You need to deploy Policy Based Routing for the lab subnet so it goes out the correct ISP. 

On the 3750s in order to be able to do PBR, you need IP services license, as IP Based will not support it.

http://www.cisco.com/c/en/us/support/docs/ip/ip-routed-protocols/47121-pbr-cmds-ce.html

http://www.cisco.com/c/en/us/td/docs/ios/12_2/qos/configuration/guide/fqos_c/qcfpbr.html

HTH

[brian.vanoy]

Thank you, Reza Sharifi!

[Reza Sharifi]

Brian,

VRF will work fine for this scenario.

LAN: 192.168.10.x 255.255.255.0 will use the global routing table to connect to the service provider (Internet).

LAB: 70.40.216.x 255.255.255.0 will use a VRF to connect to the service provider (Comcast/Internet).

This would keep the 2 subnets completely separated and each subnet will use its own gateway.

To do VRF you would need IP Service license.

HTH

[Joseph W. Doherty]

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Depending on what you're trying to actually do (beyond the to last resort gateways), VRF-Lite may be useful too.

[brian.vanoy]

Joseph, thanks for your reply.  Below is a little more detail in regards:

What we have is two separate internet gateways for two separate subnets of traffic traversing the same interconnected Cisco 3750 switch configuration on the local LAN.

LAN: 192.168.10.x 255.255.255.0

LAB: 70.40.216.x 255.255.255.0

What we need is for each subnet to send/receive traffic through their own gateway router (192.168.10.1 and 70.40.216.1) out to the public internet.

Thanks, Brian