Connecting 3660 router to 2948G L3 switch

[tuks]

Im having a 2948G L3 switch/router. We've created etherchannels and our coure routing is is handled by this switch/router. Weve also created two BVI's and routing beteween the BVI's

We bought a 3660 and want to use it as our main core router with the 2948G L3 doing the switching and Etherchannel.

My main concern is enabling the 3660 router to router between the 2 BVI's.

Would appreciate if I get some help.

Regards

"A faithful heart makes wishes come true"

 

[tuks]

Folks,

Urgently request for someone to give tips on this

regards

 

[tshorts]

If I understand you correctly - you don't want to enable IRB routing on the switch. The 2948G-L3 is an odd animal. See the url below, but one thought is to enable IRB with bridging only, configure trunking between the switch and the router and associate the respective bridge-groups with their vlans. On the router enable trunking and build subinterfaces and route between the subinterfaces.

http://www.cisco.com/warp/public/473/29.html#example3

Hope it is helpful.

Thanks,

Tim

 

[tuks]

Tim,

Thanks. Will read that

 

[llyolf]

The other option to your doing this is keeping the config you have on the 2948G-L3 and adding a /30 (255.255.255.252) IP block between the 2948G-L3 and the 3660, basically creating a "routing link" from the 3660 and the 2948G-L3. This probably requires less work than moving the BVI's to the 3660. Either way will work.

Thanks,
Paul

 

[tuks]

llyolf,

Thanks for the input. I think the best option will be adding that /30 IP block that so that I dont cause longer network shutdown. We had routes like this: ip route 10.1.96.0 255.255.255.0 BVI1

These are the static routes Im worried about.

How will I do this from the 3660 ?

Thanks

 

[llyolf]

you wiould add the same routes on the 3660 only pointing to the IP of the 2948 (the 2948 side of the /30). so say you have 10.1.1.0/30 (10.1.1.1 on the 3660 and 10.1.1.2 on the 2948). your route for the about will be

ip route 10.1.96.0 255.255.255.0 10.1.1.2

the other thing you could do if you had lots of routes, is use something like OSPF or RIP v2 but in a simple setup, to keep things simple, I would say use statics.

Thanks,
Paul

 

[tuks]

llyolf,

Thank you so much for the contribution. i think this will be the best solution for the time being. Will do that and let you know.

Thanks

 

[scraig84]

OK - Maybe I didn't read your posts long and hard enough but I am REALLY confused about something here. You have a layer 3 switch that moves traffic at 10Mpps. However, rather than going ahead and using that switch to route, you are going to use it as a simple layer 2 device, introduce an extra layer 2 hop (actually 2 if the router is connected to the switch over a single interface), and route at a measly 120Kpps. Is there something I am missing? Even if you need the 3660 for it's WAN interfaces or something, why would you core route everything there instead of at the switch?