i would like to say that its all depends on your existing network design and infrastructure... now you didnt specify that your both the connection are terminated at the same router or one connection from ISP-A is terminated at one router-A and other conncetion form ISP-B is terminated to the other router-B... you can have different type of feature as per the connectivity or you can say your existing network infrastructure...
i think you are talking about the two different department so i assume your both the ISP connection terminated at the different router then you can have GLBP and HSRP kind of thing... now you want to let your one department traffic should follow ISP-A path and other department traffic should follow ISP-B path then try for the HSRP with the two different standby group...but here you should consider the network topology also...means your both the router should be reachable to each other... now your IP addressing will also come in to the picture both the department should have different subnet... so you can use the different subnet virtual ip address...now let one router be a active router for the one subnet and other router is the active router for the other subnet... and also check for that your router and IOS support the HSRP or not...
now if your both the connection terminate with the same router then... if your network design is simple then use static route with variable AD...
letsay your one department is having ip addresses of 192.168.1.x and other is having 192.168.2.x... ISP A connection terminate at the interface A and ISP B connection terminate at the interface B then you can have two static route for one ip addresses range(configure static route for 192.168.1.x with default AD which point to the interface A and also with the AD of 100 which point to interface B and two static route for the other ip address range(configure statiroute for 192.168.2.x with default AD which pointing to the interface B and also with the AD of 100 which point to the interface A), so here you will have the redundancy also...
Just to clarify - at the moment we only have ONE ADSL connection with traffic from both departments going through the single connection.
We want to install a 2nd ADSL line and separate the traffic from each department so that they each have their own ADSL link (but can use the other department's ADSL connection if there was a failure)
So - what I want to try to decide is whether it would be best to either:
1) Keep existing Cisco 837 and buy similar router for the 2nd ADSL connection. Then, as you have described, it sounds like I could use HSRP or GBLP (not too familiar with GBLP but I assume its similar to HSRP but allows some form of load balancing?) to achieve resilience between the connections.
2) Replace the existing Cisco 837 router with another router altogether and have both ADSL connections terminate on the same router. Then, again as you have described, I could use static routes with variable adminstrative distances.
Any suggestions on which of the above would provide the best solution?
but first of all check it out that your router provide the GLBP future or not...
i prefer to have two router... and different connection terminate to the different router... so it will have good redundancy... if you have one router and you terminate both ISP link to same router and if your whole router goes down then you will not have communication with the internet... so prefer to have the two different router with HSRP configuration (use two different standby group so you can have good redundancy)
i think following IOS suppor GLBP and may be your router support the following IOS:12.4(9)T 12.3(11)YS1 12.3(11)YK2 12.3(11)T9 12.3(8)YG4 12.3(8)YA1 12.3(8)T9
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