11-13-2006 04:33 AM - edited 03-05-2019 12:46 PM
Hi,
I am looking for a way to forward between 2 vlans, but remaining within a single L3 domain.
Example: PC1--RTR1--VL10--SW1--VL20--RTR2
Notes: PC1 has default gateway of RTR2
Any ideas on how to do this without adding another L3 hop?
Thanks
Alan
11-13-2006 04:34 AM
Oops sorry, forgot to mention, RTR1 has default gateway of RTR2, not PC1
11-13-2006 05:11 AM
i am not really understood about ur exact requirement. if you put it in diagram, i can give some suggestion.
11-13-2006 05:51 AM
PC1----RTR1--(VL10)--SW1--(VL20)--RTR2
PC1 must be able to ping RTR2.
PC1 Def.GW is RTR1.
RTR1 Def.GW is RTR2
SW1 must forward frames from VL10 to VL20 and vice versa.
SW1 has only L2 config, No IP addresses etc..
11-14-2006 12:21 AM
Connect pc1 to vlan 10 interface in switch, and rtr2 to vlan 20 interface in switch. Connect rtr1 to switch and configure dot1q trunk between switch and rtr1 allowing vlan 10 and?20. Configure bridging between vlan 10 and vlan 20 subinterface on router.
Forwarding between 2 vlans on same IP subnet is called bridging :o)
11-14-2006 01:48 AM
Thanks pkrohn, I hadn't considered that as RTR1 is not under my control and so cannot be configured as such. For that matter RTR2 is not under my control either. This leaves me SW1 which I can configure. Actually, bridging is not ideal as it will merge the vlans. Is there a way in SW1 to do forwarding between vlans based on ACL or the like?
11-14-2006 06:48 AM
Hi alan -
If you do routing in the switch between different vlans and IP nets you can apply an access-list to the L3 interface - but then of course you introduce a L3 hop, and will have problems with the placement of the DG.
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