router on a stick with Cisco router

I have the scenario below with 1 connection from the switch to the router and have the router on a stick configuration on the router. But what if I have another switch connected to the router. How will I configure the router? Do I need another set of IP addresses (, .20.2, etc...) for the specific VLANs? Thx

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Unless you wanted to the separate switch to be on even more separate VLANs, then just hook switch 2 to switch 1, trunk the ports that connect them, and add the VLANS to switch 2
Yes, you will need to have another set of addresses in that case, but not from the same IP range, since router will not permit to assign IP address to interface if the same IP address range is already present on another router's interface. But, why not connect switch to switch instead of switch to router? That should solve your problem.

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leblancAccountingAuthor Commented:
I want to stay away from the daisy chain type of setup. If I connected sw2 to sw1. If sw1 fails, sw2 will fail as well.
Unfortunately, if you don't daisy chain you may be introducing artificial boundaries between the 2 switches, and the router will experience unnecessary load routing traffic that might otherwise be on the same subnet.  If you are concerned with switch failure, the solution is probably to buy a better switch.  We have nearly 100 Cisco switches in service(2960/2960S/2960X/3524XL/3550/3560/3560G/3750X).  I can count on 1 hand the number of switch hardware failures we've had in the last 12 years and most of those were with 2 models, 3524XL and 3550 that were nearly 10 years old when the failures happened.  At the very least, buy an 8 port 2960C and use it as a "bridge" for your 2 cheap switches.  If you are already using  Cisco Catalyst switches, then the concern for switch failure is probably unwarranted.
I never looked into this, because we just used an old router as a secondary and set up HSRP, which is a common design, but it appears you can use something called IRB to bridge the 2 router interfaces and avoid an artificial boundary.

I couldn't find a doc indicating how broadly this is supported on routers, but I tried some of the commands on a 26xx router and appears to be supported.  Should solve your problem.
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