2 Leased Lines in LAN Network

[asugama82]

Hello there,

I would like to ask for some advice on my current setup.

Layout:

Line01              Line02        

     |                    |

Cisco 2951     Cisco 2951

     ---------------------

               |

     Cisco 3750G - Server #1 & #2 for domain controller, sharepoint, etc

               |

     ---------------------

     |                    |

Cisco 2960     Cisco 2960

     | | | | | | | ... | | | | |

workstation #1, #2, .... #70

And I would like to ask some opinion on the best configuration for the above layout:

1. Configuration #1 - Using load sharing and automatic failover

So I want to ask whether there's any link/url that provides details/guides on how to setup the load sharing and failover?

2. Configuration #2 - Workstations 1 - 35 will be routed through Line01 gateway and workstations 36 - 70 will be routed through Line02

As for this configuration, it's done now. However, I want to know whether there's any software (preferred web based application which allows me to change the gateway from line #1 to line #2 for all 70 computers instead of having to go to each workstation to update the gateway).

Many thanks...

[Vaibhava Varma]

Hi Agus Sugama

Looking at the network setup and traffic flow requirement , we would need here Policy-Based Routing to solve our traffic requirement. What PBR will do is that instead of following the default rule of destination based packet switching it will match the Source and Destination IP address in the IP packet as send the packet out of the desired GW instead of follwing the routing table.

This way we can achieve the desired load-sharing. Also PBR has an inbuilt failover recovery mechanism whereby if the manually set GW is not available then the routing-table is consulted and packet is sent out normally as it would have been.

Here using PBR we would need to match using an ACL on the Source IP of the workstations which would again be a constraint and for 1-35 we can apply no PBR and for 36-70 apply PBR. All the workstations would still have the same GW on the LAN.

Though for the PBR to work we would need an L3 connectivity between the two 2951s to redirect the Traffic to the Line02 based upon the matching source IPs from workstations.

Below is a good and helpful link for same.

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a008009481d.shtml

Hope this provides some insight in your traffic requirements.

Regards

Varma